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Irritable Bowel Syndrome: Manipulating the Endocannabinoid System as First-Line Treatment This is an open-access article distributed under the terms of the Creative Commons Attribution License Research suggests CBD oil can alleviate symptoms of IBS-C & IBS-D. View the best CBD oils for IBS & how to find a safe & effective dose. Best Way to Take CBD Oil for IBS IBS is an uncomfortable condition that affects around 35 million people in the United States. Since many conventional treatments for IBS cause significant side

Irritable Bowel Syndrome: Manipulating the Endocannabinoid System as First-Line Treatment

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Irritable Bowel Syndrome (IBS) is a functional disorder characterized by abdominal pain, spasms, and altered bowel movements, either predominantly diarrhea (IBS-D), or predominantly constipation (IBS-C), or alternating between those states (Saha, 2014). In the Western world it affects the 10–15% of the population (Canavan et al., 2014). IBS represents a visceral hypersensitivity, with features of gastrointestinal (GI) allodynia and hyperalgesia. Considered a life-long condition, it is clear that significant gastrointestinal insults, such as food poisoning or antibiotic administration, may generate attacks that persist, often indefinitely. Attacks are associated with anxiety and depression, but controversy carries on to which incites the other (Saha, 2014). It is possible that some patients may develop a vicious cycle of worsening physical and psychological symptoms (Jones et al., 2013, 2017).

Currently, IBS sufferers are prescribed opioids, anticholinergics, and antidepressants, however with quite suboptimal results. Other compounds have been formulated to interact with serotoninergic circuitry, nevertheless these have been withdrawn from certain markets due to association with ischemic colitis (alosetron, cilansetron) and cardiovascular events (tegaserod), leaving, de facto, an urgent clinical need (Ford et al., 2014; Lexicomp Online, 2017).

The Endocannabinoid System (ECS) is known to modulate several functions, including mood, anxiety, and memory retrieval of traumatic events and it directly coordinates GI propulsion, secretion, inflammation, and nociception, providing a rationale for agents capable of interacting with the ECS as treatment candidates for IBS (Russo, 2016).

Irritable Bowel Syndrome and the Endocannabinoid System

Endocannabinoid System in the Bowel

The ECS is ubiquitously expressed in the human body and it actively controls gut homeostasis. The best characterized ECS receptors are the cannabinoid receptors 1 (CB1) and 2 (CB2) (Mackie, 2005).

CB1 has been found in intestinal epithelial and in the enteric nervous system (ENS) (Coutts and Izzo, 2004).

Physiologically, the activation of presynaptic CB1 attenuates large and small bowel muscle tone and inhibits GI motility, mainly by reducing the release of acetylcholine from enteric nerves and also by inhibiting all the components of the peristaltic reflex (Wright et al., 2005). Moreover, CB1 activation, via the purinergic system, inhibits spontaneous ileal contractions and modulate the activity of vagal neurotransmission, reducing intestinal peristalsis (DiPatrizio, 2016).

CB2 has been found on enteric neurons but it is predominantly expressed by intestinal immune cells (Izzo, 2007). Targeting intestinal CB2 decreases inflammation through the reduction of cytokine and chemokine production from activated immune cells (Wright et al., 2008). In pathophysiological conditions, CB2 controls intestinal motility (Wright et al., 2008) and its activation slows down gut transit (Mathison et al., 2004).

Bot1 and CB2 have been identified in the intestinal neuronal circuitry of the transmission of visceral pain and their activation reduce visceral sensation and nociception (Hohmann and Suplita, 2006).

N-arachidonoylethanolamine (anandamide, AEA) and 2-arachidonoyl glycerol (2-AG) are the best characterized endocannabinoids; they are synthesized from membrane phospholipids on demand: AEA is synthesized by N-acyl-phosphatidylethanolamine phospholipase D (NAPE-PLD); and 2-AG by diacylglycerol lipase (DAGL), then they are released and induce a local response by activating CB1 and/or CB2 receptors (the latter being involved mainly in pathophysiological conditions) (Izzo and Camilleri, 2008). These compounds are involved in the control of food intake and hunger (DiPatrizio, 2016; Lee et al., 2016). Specifically, AEA seems to regulate appetite and energy balance, while 2-AG may serve as a general hunger signal (Di Marzo and Matias, 2005; DiPatrizio, 2016). AEA, via CB2, plays also a pivotal role in maintaining immunological health in the gut (Acharya et al., 2017).

Subsequent to their activation, endocannabinoids are inactivated by reuptake from the degradative enzymes fatty acid amide hydrolase (FAAH), located in cells of the myenteric plexus and monoacylglycerol lipase (MAGL), present in the nerve cells and fibers throughout the muscle mucosal layers of the intestine (Di Marzo, 2006).

Inhibition of MAGL and FAAH in the gut significantly reduces experimental colitis in mice, through mechanisms that involve a rise in 2-AG or AEA levels, respectively, and the stimulation of both CB1 CB2 signaling (Massa et al., 2004; Sałaga et al., 2014; Vera and Fichna, 2017).

N-palmitoylethanolamine (PEA) and other N-acylethanolamides (NAEs) are also expressed in the gut (Izzo and Sharkey, 2010). NAEs are atypical endocannabionoids: their structures resemble the classical endocannabinoids and they are preferentially metabolized by FAAH, but they do not bind CB receptors (Izzo and Sharkey, 2010; Ahn et al., 2014). NAEs, especially PEA, are involved in the control of various functions, including food intake, neuroprotection, nociception, and inflammation (Suardíaz et al., 2007; Ahn et al., 2014; Lowin et al., 2015).

Other components of the ECS are the transient receptor potential (TRP) channels, such as TRPV1, TRM8, and others (Storozhuk and Zholos, 2018). These receptors, widely expressed throughout the digestive tract, are involved in numerous processes: taste, chemo- and mechanosensation, thermoregulation, pain and hyperalgesia, mucosal function, gut homeostasis, and control of motility, amongst others (Kaneko and Szallasi, 2014).

GPR55, another potential cannabinoid receptor, seems to be also implicated in gut motility. Its inhibition reduce motility in mice and this effect was reversed by cannabidiol (CBD), but not by CB1 or CB2 receptor antagonists (Li et al., 2013).

The ECS is also an important modulator of the gut-brain axis. In the gut, receptors of the ECS (especially TRPs) are involved in sensory transduction of a large number of external and noxious stimuli (Holzer, 2011). In the brain, the ECS controls nausea and vomiting, especially through CB1 receptors in the dorsal vagal complex of the brainstem, and stress-induced alterations of the ECS have been linked to altered visceral sensations (Sharkey and Wiley, 2016).

The main role of ECS in the GI tract is controlling intestinal hyper-contractility. Moreover, it modulates visceral sensations, intestinal inflammation and gut–brain communications, all functions that appear to be dysregulated in IBS.

IBS and Endocannabinoid Deficiency

Clinical Endocannabinoid Deficiency (CED) has been confirmed as a plausible feature in a series of difficult-to-characterize psychosomatic pathologies, which display hyperalgesia, anxiety, and depression (Russo, 2004, 2016); Migraine, fibromyalgia and IBS fall in this category, often showing comorbidity in the three diagnosis (Nicolodi and Sicuteri, 1996; Sperber et al., 1999; Peres et al., 2001). CED occurs either as a congenital disorder, or as a result of epigenetic changes.

IBS subtypes exhibit distinct variations of the ECS tone. IBS-D patients show genetic alterations affecting endocannabinoid metabolism, variants of the CNR1 and FAAH genes, and lower levels of Oleoylethanolamine (OEA) and PEA compared to healthy subjects (Fichna et al., 2013). Specifically, the CNRI rs806378 CT/TT genotype shows a significant association with colonic transit in IBS-D (Camilleri et al., 2013). Conversely, IBS-C patients show levels of OEA higher than healthy volunteers, and reduced levels of FAAH mRNA in intestinal tissues (Fichna et al., 2013).

Some of these changes may occur as the result of chronic stress, which profoundly impacts the ECS: it silences the Cnr1 gene promoter via an increased methylation by DNA (cytosine-5)-methyltransferase 1, but it also activates the Trpv1 promoter via acetylation (Hong et al., 2015). This results in reduced levels of CB1 and increased levels of TRPV1 in the sensory neurons localized in the pelvic organs, including the colon, which is a feature of visceral pain, as later discussed (Fichna et al., 2013).

Stress in the early-life stage is also an important contributor to IBS development and it is associated with epigenetic changes that lead to visceral hypersensitivity (Moloney et al., 2015). Maternal deprivation increases the expression of the endocannabinoid genes Cnr1, Cnr2a, Cnr2b, and GPR55 in the frontal cortex of male rats, whereas in female rats, increased expression was reported only in the hippocampus, a difference that may underline the prevalence of IBS in the female population (Marco et al., 2014). The relevance of pediatric stress in IBS is supported by the fact that infantile colitis, characterized by visceral sensitivity and dysphoria and resistant to most pharmacotherapies, seem to be offset by the endocannabinoids present in maternal milk, reason for it is hypothesized that this condition may also be a CED (Russo, 2004). Taken these data together, genetic polymorphisms and alterations in gene expression are associated with disturbances in GI motility and sensation, supporting the pathophysiologic significance of alterations in the ECS in the gut (Moloney et al., 2015).

Utilizing ECS-Modulating Agents for IBS

ECS-Modulating Agents

Gut health devoid of pain and maintenance of balanced body weight seems to require a complex interplay between diet, enteric flora, and endocannabinoid balance (Clarke et al., 2012; Russo, 2016). Oral administration of Lactobacillus acidophilus NCFM induce a direct increase of the cannabinoid receptors CNR2 mRNA (Rousseaux et al., 2007). This result corresponded with an enhancement of morphine analgesic effect in rats, which was inhibited by administration of the CB2 antagonist, AM-630 (Rousseaux et al., 2007). Cannabinoids may also directly alter the microfloral balance, as underscored by the finding that THC affected the Firmicutes:Bacteroidetes ratio in obese mice, preventing their weight gain despite a high-fat diet (Cluny et al., 2015).

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The interaction of the microbiome–gut–brain axis is highly dependent on hypothalamic–pituitary–adrenal (HPA) stress modulation, which is dysregulated in IBS patients (Chang et al., 2009). The ECS regulates basal and circadian HPA axis activation (Patel et al., 2004; Liedhegner et al., 2014), and these changes relate to the differences in visceral sensation that feature in IBS (Gschossmann et al., 2001). Linkage of the cannabinoid–vanilloid pathway to the HPA axis has been demonstrated by experiments monitoring rats inoculated with corticosterone, mimicking chronic stress, which developed visceral hyperalgesia (Hong et al., 2011); moreover, as also shown by another stressed rat model (Hong et al., 2009), the levels of AEA and the expression and phosphorylation of TRPV1 increased in the animals, whilst CB1 expression decreased in lumbosacral primary afferent neurons localized in the colon, but not in those innervating the lower extremities (Hong et al., 2009, 2011). AEA is an endogenous agonist at both CB1 and TRPV1 (McPartland et al., 2007), receptors that co-localize in nociceptive primary sensory neurons (Ahluwalia et al., 2000). Activation of CB1 inhibits nociception, whereas agonism at TRPV1 increases pain perception (Malik et al., 2015). Treatment of stressed rats with the CB1 agonist WIN 55,212-2 or the TRPV1 antagonist capsazepine prevented visceral hyperalgesia (Hong et al., 2009). Similar data have been observed in biopsies from IBS sufferers, which show a 3.5-fold elevation in TRPV1-immunoreactive nerve fibers (Akbar et al., 2008).

Considering this evidences, it has been posited that chronic stress causes down-regulation or loss of CB1, activation of the HPA stress response, anxiety, and induces visceral hyperalgesia that involve region-specific changes in endovanilloid and endocannabinoid pathways in sensory neurons innervating the pelvic viscera (Morena et al., 2016). Thus, a rationale exists for the use of compounds that boost AEA and PEA levels and desensitize TRPV1, to treat hypersensitivity and pain in IBS. While some authors have encouraged the use of the phytocannabinoid cannabidiol (CBD), no clinical trials have tested this hypothesis (Russo, 2004; Pandey et al., 2020). CBD may be an useful therapeutic intervention as it desensitizes TRPV1 and inhibits PEA and AEA hydrolysis and uptake (Bisogno et al., 2001).

Targeting endocannabinoid-degrading enzymes to increase AEA may be an interesting model (Sakin et al., 2015), given their role in the tonic disinhibition of periaqueductal gray region of the brainstem to promote analgesia and chronic stress-induced anxiety (Lau et al., 2014; Sakin et al., 2015). A dual FAAH and COX inhibitor has been shown to increase AEA and PEA levels, reducing features of colitis in mice (Sasso et al., 2015).

Clinical Trials With ECS-Acting Agents

Despite the numerous lines of evidence showing the involvement of ECS in the regulation of IBS features and the promising data from pre-clinical studies, few clinical trials tested the effect of ECS-modulating agents in IBS.

On the other hand, ECS alteration in IBS patients has been clearly documented.

As ECS is known to decrease motility, effects of dronabinol, a non-selective agonist of the cannabinoid receptors, have been tested on IBS patients (Wong et al., 2011). In a 2011 clinical trial, dronabinol reduced fasting colonic motility in all IBS-D patients, particularly those carrying the CB1 receptor polymorphism rs806378 (Wong et al., 2011). Another clinical study carried out a few years later, failed to replicate these results, obtaining only modest delay in motility, maybe for differences in methods (manometry vs. radioscintigraphy) and the lower number of patients enrolled (Wong et al., 2012). Dronabinol can also improve visceral sensitivity and colonic relaxation, as showed in a double-blind, placebo-controlled trial (Esfandyari et al., 2007).

As mentioned before, Fichna et al. showed that lower PEA levels are associated with cramping abdominal pain (Fichna et al., 2013). A randomized placebo-controlled multicenter study assessing the efficacy of PEA in IBS, revealed that PEA may be an useful tool for pain management in this condition (Barbara et al., 2014).

Since visceral hypersensitivity is linked to an increase in Ts regard, a 2011 pilot study found that ingesting capsaicin-containing enteric-coated pills desensitized TRPV1 and decreased the intensity of abdominal pain and bloating in IBS patients vs. placebo (Bortolotti and Porta, 2011). Another study confirmed that TRPV1 desensitization reduced visceral hypersensitivity, symptoms, and abdominal pain (Wouters et al., 2016).

Menthol-induced analgesia and pain relief is mediated mainly by TRPM8 (Liu et al., 2013). This is the rationale for various trials that analyzed the efficacy of peppermint oil (containing menthol) in IBS. Even with some limitations mainly due to the delivery system of peppermint oil in the digestive tract, it turned out an effective treatment capable of improving IBS symptoms, especially abdominal pain, even in children suffering IBS (Kline et al., 2001; Cappello et al., 2007; Merat et al., 2010; Cash et al., 2016).


Although the pathophysiology of IBS remains unclear, targeting the ECS may represent a promising strategy to modulate gut motility, visceral hyperalgesia, low-grade intestinal inflammation, and gut–brain axis alteration, all features that may improve IBS symptoms onset. It is also evident that both an IBS-diet (Wouters et al., 2016) and a stress-relief practice are required to boost the beneficial effects of any of the agents suggested.

In light of this, agents capable of modulating the ECS may provide a strategy worth attempting even first line treatment for IBS patients ( Figure 1 ). This is due to the fact that compounds such as PEA, CBD and peppermint oil display a very large safety profile and have been proving beneficial to improve IBS symptoms (Halford et al., 2018); PEA, peppermint oil, THC and its synthetic analogs may be recommended in IBS patients to improve abdominal spasms, cramps and visceral pain. THC and CBD may alter ECS-driven response to the pathology. However, there is still a wide gap in the current understanding of IBS mechanism and in the use of cannabis containing both CBD and THC as potential therapy, which can only be bridged by randomized clinical trials.

IBS features modulated by ECS. Schematic representation of the Endocannabinoid System (ECS) involvement in lBS features and its interaction with hypothalamic-pituitary-adrenal (HPA) axis throughout day/night. The black arrows indicate the receptors and the target sites controlled by ECS components. In red are shown the agents capable of modulating ECS activities that may be useful to improve IBS symptoms, such as motility, visceral pain, and low-grade inflammation. Blue arrows indicate a decrease in the functions targeted by ECS stimulation. TRPV I, Transient receptor potential vanilloid I; CB I, Cannabinoid Receptor I; CB2: Cannabinoid Receptor 2; TRPM8, Transient receptor potential melastatin 8; CBD, cannabidiol; THC, tetrahydrocannabinol; FAAH, fatty acid amide hydrolase; COX, cyclooxigenase; MAGL, monoacyl glycerol lipase; PEA, palmitoylethanolamide; PPARa: Peroxisome proliferator-activated receptor a.

Author Contributions

VB and FT contributed to conception and design of the study and wrote sections of the manuscript. VB wrote the first draft of the manuscript. All authors contributed to manuscript revision, read, and approved the submitted version.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.


The authors would like to acknowledge the contribution of Adrian Devitt-Lee, University College of London.

CBD for IBS: Everything You Need to Know

IBS is frustrating. There are few effective treatments for the condition, which can make it hard to live your life to the fullest.

Here’s how CBD might be able to help.

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Irritable bowel syndrome (IBS) is not life-threatening, but it can severely disrupt the quality of life for those affected.

Roughly 1 out of 10 people in the developed world have symptoms consistent with IBS [3].

Despite how common the condition is, IBS is not well understood. As a result, there are few effective treatment options available aside from managing symptoms.

Here we’ll go over how CBD may be used to support an IBS diagnosis, how to use it, what its limitations are, and how to get the most out of it with other diet and lifestyld modifications.


Updated on November 14, 2021

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The Benefits of CBD Oil For IBS

There are many potential causes for IBS, but much of what triggers the condition remains unknown. Most of the causes point to a loss of equilibrium in the digestive tract. So the carefully orchestrated balance involved with digestion, absorption, immune defense, and excretion is compromised.

Cannabidiol (CBD) helps with this problem because it serves as a way to “calibrate” different parts of the body. It does this by improving the communication between cells through the endocannabinoid system.

The benefits of CBD oil for IBS Include:

  • Addresses anandamide deficiencies [13]
  • Reduces inflammation [7, 8]
  • Inhibits digestive muscle hyperactivity and cramping [5, 6]
  • Decreases appetite [9]

CBD will affect the condition differently depending on the form of IBS.

People who have IBS with diarrhea (IBS-D) are likely to experience the most benefit from CBD because cannabis slows muscle contraction in the digestive tract.

But people who have IBS with constipation (IBS-C) can still find benefit from CBD due to the anti-inflammatory, appetite-suppressant, and immune-stimulating properties of the compound.

We’ll get into the different forms of IBS and how CBD is used to support them later on.

What Form of CBD Should I Use?

CBD comes in all different forms. You can buy oils, capsules and concentrates.

When it comes to IBS, the most popular options are oils, capsules, and suppositories.

CBD oils and capsules are easy to take, to store for long periods of time, and can be accurately dosed.

Suppositories have the benefit of delivering the CBD directly to the affected area. This is best for severe IBS-D (more on this below) but can benefit other forms of IBS as well.

What’s The Dose of CBD Oil For IBS?

Dosing CBD can be a challenge because it affects everybody differently.

Some people take 50 mg of CBD per day, while others need more or less.

The dose also depends on the form of CBD you’re taking. As we mentioned, CBD oil and suppositories are the most popular for people with IBS, but the dose for each form varies significantly.

If using oils or capsules, the best way to find a good starting dose it to read through our CBD oil dosing guide.

CBD Dosage Calculator

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For IBS, we recommend starting at the low strength and working your way up slowly to see how you react to CBD.

It will likely take about two or three weeks of regular CBD use before you start noticing any real benefits for your IBS symptoms.

If using CBD suppositories, it’s best to follow the specific instructions listed by the supplier on the packaging. Concentrations can vary from one CBD suppository to the next.

How to Get the Most Out of CBD Oil for IBS

CBD shouldn’t be used alone to treat IBS. This condition is highly complex and involves multiple organ systems.

Other forms of treatment, including dietary changes and physical activity, are essential. If these lifestyle changes aren’t addressed, CBD is not likely to have any effect at all.

You can think of CBD as a bus driver — it will drive the occupants towards a destination, but they can’t arrive without a well-maintained bus filled with gas.

CBD is a tool to help alleviate uncomfortable symptoms of IBS and is used to bring the body back to balance.

What is CBD Oil?

CBD stands for cannabidiol. It’s one of the primary cannabinoids in the cannabis plant.

Most CBD oils on the market today come from the hemp plant (Cannabis sativa), which is a strain of cannabis naturally low on THC — the primary psychoactive cannabinoid.

This means that most CBD products on the market have no psychoactive effects.

CBD is used as a health supplement for a wide range of medical conditions. It owes much of its ability to support health to its involvement with the endocannabinoid system.

The endocannabinoid system regulates balance in the body, otherwise known as homeostasis. This includes the immune, digestive, neurological, musculoskeletal, and integumentary (skin) systems.

What is Irritable Bowel Syndrome?

Irritable bowel syndrome (or IBS) is classified as a syndrome, rather than a disease because it’s a set of symptoms that can’t be linked to a particular cause.

IBS can be summarized as a “widespread dysfunction of the digestive tract.”

Symptoms involve bloating, abdominal pain, indigestion, and changes in bowel movements (constipation or diarrhea, which can be severe).

The symptoms of IBS are very similar to those of inflammatory bowel disease (IBD). The difference is that IBD has inflammation present in the gastrointestinal tract, confirmed by Lab tests and special cameras inserted in the digestive system.

If no inflammation is present to confirm a diagnosis of IBD, an IBS diagnosis is given instead.

In this process, there are some diagnostic criteria put in place by various experts, but none of them are conclusive and not all doctors agree on them for a diagnosis of IBS.

The most popular criteria doctors tend to use is something called the Rome III Criteria.

IBS Diagnosis: The Rome III Criteria Checklist

In order to meet a diagnosis of IBS, the patient must have the following symptoms:

  • Recurrent abdominal pain or discomfort at least 3 days per month over 3 months
  • Symptoms involving at least two of the following characteristics:
  • Improvement of symptoms with defecation
  • Onset associated with a change in stool frequency
  • Onset associated with a change in stool form

If these criteria are met and there is no other explanation for a cause (such as inflammation, traumatic damage, or infectious disease) the patient is diagnosed with IBS.

Symptoms of Irritable Bowel Syndrome:

3 Types of IBS & the Effects of CBD

20-50% of visits to a gastroenterologist end in a diagnosis of IBS [3], making it the most common functional disorder of the digestive system.

Gastroenterologists further classify IBS according to the most predominant symptoms:

1. Diarrhea-Dominant IBS (IBS-D)

This refers to IBS presented primarily with diarrhea.

IBS-D symptoms indicate that the bowels are filling with water. Common precursors for this include high sodium foods, a poor gut membrane, and hyperactive muscle activity in the digestive tract.

With high sodium foods and poor membrane control, water begins to accumulate in the areas filled with salty foods. This happens because of a principle in biophysics called osmosis: the water goes where the salt is. As the intestines fill up with water, it causes diarrhea.

Additionally, many people with IBS-D experience hyperactive muscle activity in the intestinal tract. When the muscles become spastic, they experience cramping, abdominal pain, and bloating. The digestive tract pushes food through too quickly without properly breaking it down and absorbing it. Instead, unabsorbed foods begin to ferment in the large intestine, causing severe bloating, nausea, and diarrhea.

CBD is useful for this type of IBS because it can reduce spastic muscle activity in the gut, allowing it to properly digest and absorb nutrients. For this type of IBS, it’s best to combine CBD with a low-sodium diet and a good source of soluble fiber.

2. Constipation-Dominant IBS (IBS-C)

IBS-C stands for IBS presented predominantly with constipation.

This type of IBS indicates low activity in the digestive tract. Pancreatic enzymes, bile, and stomach acid are scant. These enzymes help break down our food and stimulate the smooth muscle lining our intestines. This stimulation causes the muscles to expand and contract, moving food along the digestive tract.

If there is a problem with the secretion of digestive enzymes or muscle movement in the intestinal tract, we become constipated.

This can be extremely uncomfortable, causing symptoms such as severe bloating, feelings of fullness, nausea, fatigue, and physical belly distention.

Although nothing will produce the same level of benefit as a change in the diet, CBD does offer some unique benefits to this form of IBS.

CBD increases anandamide — a naturally occurring endocannabinoid responsible for slowing bowel movement, fighting inflammation, and controlling microbiome diversity.

3. Alternating IBS (IBS-A) or Mixed-type IBS (IBS-M)

This form of IBS involves alternating bouts of diarrhea and constipation.

The potential causes of this type of IBS are far more variable and can involve factors of both. For several months, the patient may suffer from constant diarrhea, followed by several months of severe constipation. The sudden changes in bowel activity can be due to dietary, neurological, or immunological factors — making the cause hard to isolate and treat.

CBD is useful for this type of IBS because it doesn’t push the digestive function in any specific direction. Instead, it improves the body’s ability to regulate homeostasis. Along with other therapies to manage symptoms, the body has a better chance of returning to a higher state of health on its own.

What Causes IBS?

The exact cause of IBS is not yet understood — but there are some well-accepted theories in the medical community.

Suspected Causes of IBS Include:

1. Diet

Western countries including Canada, The United States, and Sweden have the highest rates of IBS in the world [11, 12]. In the United States, roughly 1 in 10 people suffer from IBS.

These nations often consume diets high in processed foods. Foods that have been highly processed tend to have poor nutritional content (in terms of vitamins, antioxidants, minerals) and are high in calories (in the form of fat or sugar).

When we eat these foods, they tend to move slowly through our digestive tract due to the lack of fiber and bulk of the food.

The slow movement and high sugar content cause this food to ferment in the digestive tract by bacteria living there. Fermentation in this context is bad for our digestive functioning — it causes bloating, pain, and changes in bowel movements.

One of the main dietary treatments for IBS is called a low FODMAPS diet, which substitutes highly processed foods for high-fiber, low sugar ones.

Frequent fermentation of processed sugars can damage the structural integrity of the digestive lining over time — leading to accumulation of fluid and diarrhea (IBS-D) or lack of movement in the muscles in the small and large intestines causing constipation (IBS-C).

2. Viral Infection

Viral infections can cause a lot of damage to the body. Many people report their IBS symptoms started shortly after getting a stomach bug overseas. After a few days of illness, they seemed to be getting better, but their gut never fully recovered.

Viruses disrupt normal cellular function, hijacking our cells to manufacture more viruses and preventing them from their job. They can wreak havoc on an entire organ in a short amount of time.

The digestive lining is home to a complex ecosystem of bacteria and fungal species called the microbiome. The microbiome is heavily involved with digestion and absorption in the digestive tract. When we fall ill with a virus, this can cause dramatic changes to the microbiome, leaving us with long-lasting side-effects, such as IBS.

3. Neurological Dysfunction

The movement of the intestinal tract (called peristalsis) is a complex orchestra of muscle contractions working together to move food through the intestinal tract. This involves careful innervation both locally and in collaboration with the brain.

Many people find that when they drink coffee, it stimulates a bowel movement. This is a good visualization of how the nervous system affects the digestive tract.

If our nervous system is in a state of constant stimulation, we are likely to develop diarrhea (IBS-D).

If we experience the opposite (insufficient stimulation), we are likely to end up with constipation (IBS-C).

Based on neurological activity, we can compare IBS types with other side-effects that often affect IBS patients at the same time.

Neurological Characteristics of IBS and Related Side-Effects:
IBS type Nervous System Activity Related Side-Effects
IBS-D Too stimulated Anxiety Panic disorders Insomnia Heart palpitations
IBS-C Not stimulated enough Fatigue Depression
IBS-A Either too stimulated or not enough Anxiety Panic disorders Insomnia Heart palpitations Fatigue Depression Immune deficiencies

4. Inflammation

Although IBS by definition does not require visible or detectable inflammation, numerous studies have shown that IBS sufferers have low-grade inflammation of the gut wall [2]. This inflammation may be too subtle to be picked up by blood tests or visual inspection with colonoscopies/endoscopies.

Common Medications Used to Treat IBS

Lifestyle and diet changes will have the most impact on treating IBS. Besides the low FODMAP diet, it can help to reduce stress and get more exercise.

In some cases, medications can be prescribed to help reduce the symptoms of IBS. For diarrhea, drugs like loperamide, rifaximin, or eluxadoline may help. Fiber supplements, laxatives, lubiprostone, or linaclotide can be used to treat constipation. Abdominal pain can be relieved with antispasmodics. Sometimes antidepressants are prescribed for those with more extreme cases.

The Endocannabinoid System & IBS

The endocannabinoid system is thought to play a major role in IBS [10].

The CB1 and CB2 endocannabinoid receptors are used to regulate different processes in the human body — many of which are present in the digestive tract.

CBD for Other Functional Disorders

IBS is considered a functional disorder, suggesting there’s a clear problem with the function of the organ without an apparent cause.

Other conditions that fit this category are fibromyalgia and chronic fatigue syndrome — both of which are also improved with regular CBD use. The mysterious nature of these conditions makes it difficult to pinpoint exactly why CBD is so useful for treating them, but the likely explanation is the role CBD plays in homeostasis.

Homeostasis is the state of balance in the body. It penetrates virtually every aspect of life — from body temperature to digestive enzyme secretion. Any issues with homeostasis can negatively affect our health.

CBD serves as a useful tool for regulating homeostasis, which is why this compound has so many different benefits.

Key Takeaways: Using CBD for IBS

Although IBS isn’t well understood, it likely involves a combined dysfunction of multiple organ systems, lifestyle habits, and diet — CBD offers broad benefits towards different variations of the condition.

It’s best to use CBD in the form of an oil, capsule, or suppository for optimal results. It’s also important to take CBD oil for long periods of time to exert its full effects. CBD can take a while to start providing benefits for this condition because there are many factors involved.

Through persistent CBD supplementation, dietary and lifestyle changes, and patience, IBS symptoms can be forced into remission for long periods of time.

Best Way to Take CBD Oil for IBS

IBS is an uncomfortable condition that affects around 35 million people in the United States. Since many conventional treatments for IBS cause significant side effects, people who suffer from the symptoms of IBS are on the hunt for alternative treatments. In this guide, learn if CBD works for IBS, and find out the best ways to take this cannabinoid if you’re suffering from IBS symptoms.

Does CBD help IBS?

Over the last decade or so, research into CBD has accelerated at an unprecedented pace, and scientists have realized that CBD may help with a wide variety of serious conditions. While there is no definitive answer regarding whether CBD can help with IBS, a significant amount of research has been invested into this subject, and scientists continue to investigate the potential benefits of CBD when it comes to inflammatory conditions like IBS.

What’s clear is that CBD, as a derivative of the hemp plant, does not have intoxicating properties, making this cannabinoid very different from THC, which is an intoxicating and addictive substance found in the cannabis plant. Therefore, IBS patients can try CBD without worrying about intoxication or any other significant adverse effects.

What is IBS?

Irritable bowel syndrome (IBS) is an inflammatory condition that affects the colon (large intestine). The most common symptoms of irritable bowel syndrome are diarrhea and constipation, but other symptoms associated with IBS include abdominal pain, bloating, cramping, and gas. As one of the most uncomfortable conditions that can affect the digestive tract, people with IBS are constantly searching for safe, natural forms of IBS relief.

How does CBD Oil Work?

Cannabidiol (CBD) is a non-intoxicating cannabinoid that does not significantly stimulate the CB1 and CB2 receptors. These cannabinoid receptors cause the feeling of intoxication that accompanies THC use, and even though full-spectrum CBD can contain up to 0.3% THC, that’s not enough to activate your CB2 or CB1 receptors.

At the same time, CBD has a profound effect on the human endocannabinoid system, which manages a variety of essential bodily processes including digestion. Some researchers believe that endocannabinoid deficiency could be one of the primary causes of both physical and mental health conditions, suggesting that taking CBD oil could offer a wide range of beneficial effects.

What research says about CBD for IBS

As an inflammatory disease that affects the digestive system, IBS is a prime target of natural therapies that provide anti-inflammatory benefits within the digestive tract. While we cannot provide medical advice or make claims regarding the usefulness of taking CBD for any condition, we can still examine the evidence that has been accumulated regarding the use of CBD in treating IBS.

Research into CBD for Inflammation

CBD has been researched extensively for its potential antioxidant and anti-inflammatory properties. Scientists are keenly interested in determining the potential usefulness of CBD in relieving chronic inflammatory pain and the symptoms of inflammatory conditions like IBS.

Research into CBD for Gastrointestinal Conditions

Researchers have examined the potential usefulness of CBD as a natural modulator of your gut’s mucosal defense system, which plays a critical role in preventing the symptoms of IBS. Current research into the effects of CBD on the gastrointestinal (GI) tract is highly limited, but early results have been promising.

How much CBD oil should I take for IBS?

Different CBD oils contain different amounts of CBD, and each CBD ingestion method affects your body differently. If you decide to use CBD for IBS, however, you may want to start with a standard dose of 10-20 milligrams taken orally per day. In clinical studies, CBD doses as high as 1,500mg tincture which is 50mg of CBD per day have been shown to be well-tolerated in human subjects, but if you’d prefer to use CBD products as sparingly as possible, even a low dose might provide the beneficial effects you’re looking for.

How should I take CBD oil for the best results?

There are quite a few different ways you can take CBD, and some might be more effective for IBS than others:

CBD tinctures for IBS

As orally ingested CBD products, CBD tinctures deliver this cannabinoid directly into your digestive tract. Along the way, however, the CBD in your tincture will also be absorbed under your tongue, potentially limiting the amount of CBD that reaches your digestive system.

CBD capsules for IBS

CBD capsules pass down your esophagus before releasing CBD into your stomach. As a result, capsules might deliver CBD into your digestive tract more efficiently than other ingestion methods.

CBD edibles for IBS

CBD edibles are tasty and convenient, but a lot of the CBD they contain is absorbed into the lining of your mouth as you chew. IBS sufferers might be better off choosing CBD capsules instead.

CBD topicals for IBS

Water-based CBD topicals penetrate your skin and spread CBD throughout underlying tissues. However, topically applied CBD might not penetrate deeply enough to deliver significant concentrations of this cannabinoid into your digestive tract.

Can you rub CBD oil on your stomach?

When you experience abdominal pain due to irritable bowel syndrome, it’s only natural to try addressing the symptoms of this condition at their source. Oil-based CBD products, however, offer very poor skin penetration, so applying CBD oil directly to your stomach is unlikely to provide the results you desire. Use a water-based CBD topical formulation instead, or use an orally ingested CBD product that delivers this cannabinoid directly into your digestive tract.

Using CBD for IBS: The Bottom Line

There isn’t enough evidence to definitively determine whether CBD might help relieve the symptoms of IBS. What’s clear, however, is that every form of CBD is non-intoxicating and remarkably non-toxic, so there’s no reason you should avoid using CBD products as you pursue weight loss and make other lifestyle changes that might help manage IBS. Anyone who has this condition would prefer to treat IBS naturally, and IBS sufferers have nothing to lose by trying CBD oil for this uncomfortable and inconvenient condition.

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