Can Chocolate Cause Diarrhea?
Digestive HealthDiarrhea

4 Reasons Chocolate Can Cause Diarrhea

Certain ingredients in chocolate, like milk or sweeteners, can cause stomach upset for some people.
4 Reasons Chocolate Can Cause Diarrhea
Everyday Health
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Updated on August 6, 2025
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There’s a reason so many of us love chocolate: It’s tasty, sweet, and certain varieties even contain health-supporting antioxidants. The treat can cause unexpected side effects for some, though, such as diarrhea.

Diarrhea after eating chocolate isn’t inevitable. But if you know you have an existing intolerance, allergy, or sensitivity to an ingredient in a chocolate product, then it’s possible consuming it will trigger symptoms.

If you regularly get diarrhea after eating chocolate, here are four potential reasons.

1. Food Intolerance

Unprompted diarrhea after eating chocolate isn’t common. Instead, a food intolerance to one of the ingredients in a chocolate bar may be to blame for your bathroom troubles.

Take dairy, for instance. Chocolate can contain milk, and if you have lactose intolerance — a condition where your body’s lactase enzymes aren’t able to break down the lactose in dairy products — you may have digestive troubles like diarrhea.

Besides diarrhea, other symptoms of lactose intolerance include:

  • Gas
  • Nausea
  • Bloating
  • Abdominal pain and cramping
If you find other dairy products, like chocolate milk, also cause digestive distress, lactose intolerance could be to blame.

2. Food Allergy

While an allergy to chocolate itself isn’t common, chocolate can cause diarrhea if you’re allergic to an ingredient in the treat.

For instance, many chocolate bars contain nuts. Nuts are one of the most common food allergens. Milk, wheat, and soy are other common allergens that may be included in a chocolate treat, too.

Besides diarrhea, other symptoms of an allergic reaction to look out for include:

  • Tingly or itchy mouth
  • Skin rashes, like hives or eczema
  • Swelling of the lips, face, tongue, or throat
  • Congestion
  • Wheezing or trouble breathing
  • Lightheadedness, dizziness, or fainting
  • Abdominal pain
  • Nausea and vomiting
Some people can have an extreme allergic reaction called anaphylaxis. This is when your throat closes up and makes it difficult to breathe. Seek medical care immediately if this happens to you.

3. Caffeine Sensitivity

Another ingredient that may cause digestive problems for some people is caffeine.

This may be the reason eating too much dark chocolate can give you diarrhea: The cocoa in chocolate, particularly dark chocolate, contains caffeine, a substance that stimulates your central nervous system to make you feel alert.

But if you’re sensitive to caffeine or consume it in excess, it can lead to diarrhea.

To avoid diarrhea from the caffeine in chocolate or other products like coffee or tea, keep your intake to under 400 milligrams per day.

4. Sweeteners

Here’s another reason chocolate can cause diarrhea: It can contain artificial sweeteners, like sorbitol or mannitol, which can lead to watery stools for some people.

Another type of sugar called fructose, which naturally occurs in fruits, may also be added to chocolate. It can likewise cause diarrhea.

The Takeaway

  • Certain ingredients in chocolate products, such as milk or sweeteners, can cause diarrhea for some people.
  • Some kinds of chocolate, like dark chocolate, contain caffeine. When consumed in excess, caffeine can trigger diarrhea.
  • An intolerance or allergy to certain ingredients in chocolate, such as milk or nuts, can cause digestive upset, including diarrhea. If you’re having other symptoms of a food allergy, such as hives, itching, or swelling of the face, tongue, lips, or throat, seek emergency medical care immediately.
EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
  1. Self-Care Guide for Living With Lactose Intolerance. Cleveland Clinic. November 5, 2024.
  2. Lactose intolerance: Symptoms & causes. Mayo Clinic. August 20, 2024.
  3. Food allergy: Symptoms & causes. Mayo Clinic. August 30, 2024.
  4. Caffeine. MedlinePlus. September 8, 2021.
  5. Common Causes of Chronic Diarrhea. International Foundation for Gastrointestinal Disorders.
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Sylvia E. Klinger, DBA, MS, RD, CPT

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Sylvia Klinger, DBA, MS, RD, CPT, is an internationally recognized nutrition expert who is relentlessly passionate about helping people fall in love with creating and enjoying deli...

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Kathleen Ferraro

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Kathleen Ferraro is a writer and content strategist with a master’s degree in journalism from Northwestern University’s Medill School and nearly a decade of experience in health, w...

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