What could excessive burping and diarrhea together suggest?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Excessive burping and diarrhea are common digestive symptoms that may point to underlying conditions such as small intestinal fungal overgrowth (SIFO), thyroid disorders, or food intolerances like lactose or gluten sensitivity. These symptoms occur when digestion is disrupted, causing gas buildup and changes in bowel movements.

Because the causes vary widely—from minor dietary triggers to conditions requiring medical treatment—identifying the root issue early can prevent complications and guide you to the right care. A quick, free symptom check can help you understand what may be driving your symptoms and clarify your next steps, all in just a few minutes online.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Excessive burping and diarrhea occuring together may be linked to a few different health issues. One possibility is small intestinal fungal overgrowth. This condition occurs when there is too much fungus in the small intestine, which can lead to symptoms like gas and diarrhea.

Another potential cause is related to the thyroid gland. The thyroid helps control how your body uses energy, and if it is not working right, it can affect your gut and cause symptoms like diarrhea.

Food intolerance is another distinct possibility. Sorbitol intolerance is an example. Sorbitol is a type of sugar found in some foods. If your body has trouble digesting it, you might experience gas and diarrhea.

If you notice these symptoms, you can get personalized insights by taking our free AI-powered symptom checker and then discuss the results with a healthcare provider to find out what might be causing them and how to feel better.

(References)

Erdogan A, & Rao SS. (2015). Small intestinal fungal overgrowth. Current gastroenterology reports, 25786900.
Ebert EC. (2010). The thyroid and the gut. Journal of clinical gastroenterology, 20351569.
Hyams JS. (1983). Sorbitol intolerance: an unappreciated cause of functional .... Gastroenterology, 6847853.

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