Can CBD Oil Cause Constipation? What You Need to Know

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Can CBD Oil Cause Constipation?

CBD oil is known for its potential to relieve pain, reduce anxiety, and promote better sleep—but like any supplement, it can come with side effects. One question that occasionally comes up is: can CBD oil cause constipation?

The answer is: it’s unlikely, but possible. While constipation isn’t a common side effect of CBD, some people do report changes in digestion after starting it. Here's why that might happen and what you can do about it.

Is Constipation a Known Side Effect of CBD Oil?

CBD is generally well-tolerated and is more often associated with looser stools than constipation—especially at high doses. However, everyone reacts differently, and in some cases, users have reported:

  • Sluggish digestion

  • Reduced bowel movement frequency

  • Bloating or abdominal discomfort

That said, constipation from CBD oil is considered uncommon, and if it does occur, it’s usually mild and temporary.

What Might Be Causing It?

If you’re experiencing constipation after starting CBD oil, it could be due to a number of factors:

1. Carrier Oils

Most CBD oil is blended with a carrier oil such as MCT (coconut oil), olive oil, or hemp seed oil. While these are generally gentle on digestion, some people may find MCT oil causes upset stomach or changes in bowel habits, including constipation or diarrhoea.

Try switching to a CBD product with a different carrier oil to see if that helps.

2. Dehydration

CBD may reduce saliva and sometimes cause dry mouth. If you’re not drinking enough water, this could affect your digestion and contribute to constipation. Hydration plays a key role in keeping things moving in the gut.

Make sure you’re drinking plenty of fluids throughout the day.

3. Lifestyle or Diet Changes

Sometimes people change other routines at the same time they start taking CBD—such as cutting back on caffeine, taking new supplements, or changing diet. These changes could also impact your digestion.

If you’ve made several lifestyle changes recently, CBD might not be the sole reason for constipation.

4. Dosage

Higher doses of CBD can affect the gut’s natural rhythm and interact with receptors in the digestive system. In rare cases, this might slow things down rather than speed them up.

If you’ve started on a high dose, try reducing it slightly and see if symptoms improve.

Does CBD Affect the Digestive System?

Yes, CBD interacts with the endocannabinoid system (ECS), which plays a role in regulating digestion. The ECS has receptors throughout the gastrointestinal tract, and cannabinoids like CBD may influence:

  • Gut motility (how quickly food moves through the system)

  • Inflammation in the intestines

  • Stomach acid secretion

  • Appetite and gut-brain communication

While most people report neutral or positive digestive effects, sensitive individuals may notice changes—especially in the early days of use.

How to Manage or Prevent Constipation from CBD Oil

If you suspect CBD is contributing to constipation, here’s what you can do:

  • Stay well hydrated – aim for at least 6–8 glasses of water a day

  • Review your carrier oil – consider trying a different product

  • Lower your dose and increase gradually

  • Eat a high-fibre diet with plenty of fruits, vegetables, and whole grains

  • Stay active – regular movement helps stimulate digestion

  • Take CBD with food, which may help your body tolerate it better

If symptoms persist or become severe, stop using the product and speak to your GP or pharmacist.

When to Seek Medical Advice

Occasional digestive changes are normal when starting new supplements, but if you experience:

  • No bowel movements for more than 3 days

  • Severe bloating or pain

  • Nausea or vomiting

  • Rectal bleeding

...then it’s important to speak to a healthcare professional. These symptoms may indicate a more serious issue unrelated to CBD.

Final Word

CBD oil is unlikely to cause constipation, but it can happen—especially if you’re sensitive to the carrier oil, dehydrated, or taking high doses. Most people tolerate CBD well, but like any supplement, side effects vary from person to person.

If you experience digestive changes, take a step back, review how you’re using the product, and make small adjustments. For most users, any side effects settle quickly with the right approach.