Is defecation syncope dangerous or just embarrassing?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Defecation syncope is a sudden loss of consciousness during or immediately after a bowel movement. While it may feel embarrassing, it can also be dangerous—particularly when tied to underlying conditions like heart disease, low blood pressure, or neurological disorders. Fainting on the toilet also raises the risk of serious injury from falls.

Because defecation syncope can signal something more serious, it's important not to ignore it. The fastest way to understand what may be causing your symptoms—and what to do next—is to take a free, instant, online symptom check. In just a few minutes, you'll get personalized insights to help guide your next steps, whether that means self-care, seeing a doctor, or seeking urgent care.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if fainting after bowel movements is serious Discover causes of defecation syncope See if bowel-movement fainting needs care Find OTC options for fainting-related symptoms Find a specialist for fainting episodes Discover home remedies to reduce fainting risk Understand what’s causing your defecation-related fainting

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Explanation

Defecation syncope is when a person faints during or right after a bowel movement. This happens because the body has a sudden drop in blood pressure or heart rate, which can make someone feel dizzy or faint. While it may seem embarrassing, it can also be dangerous.

According to the medical literature, defecation syncope can sometimes be linked to serious conditions. One study found that defecation can trigger events like a pulmonary embolism, which is a blockage in the lungs. This shows that while fainting during defecation might seem harmless, it could be a sign of something more serious.

It's important for people who experience this regularly to talk to a doctor. If you're experiencing symptoms like fainting or dizziness during bowel movements, you can start by using a free symptom checker to better understand what might be happening. They can help figure out if there is a bigger problem and how to manage it. So, while defecation syncope might be embarrassing, it is important to pay attention to it and not ignore it.

(References)

Komatsu K, Sumiyoshi M, Abe H, Kohno R, Hayashi H, Sekita G, et al. (2010). Clinical Characteristics of Defecation Syncope Compared .... Circulation journal : official journal of the Japanese Circulation Society, 20032564.
Kollef MH, & Schachter DT. (1991). Acute pulmonary embolism triggered by the act of defecation. Chest, 1989798.
Whitley NT, & Stepien RL. (2001). Defaecation syncope and pulmonary thromboembolism in .... Australian veterinary journal, 11491217.

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