Question 1

Why do runners get stitches in their side during exercise?

Accepted Answer

A stitch, or exercise-induced transient abdominal pain (ETAP), is caused by friction between the two layers of the peritoneum, a membrane lining the abdominal cavity. When the torso bounces during running, it can disturb the lubricated glide between these membrane layers, creating irritation along pain-sensing nerves, especially on the right side where the liver's weight increases friction.

Question 2

What drinks cause side stitches when running?

Accepted Answer

High-sugar beverages consumed before running significantly increase stitch risk. Sugary drinks and fruit juice cause the stomach to distend and empty slowly, pulling on visceral ligaments and increasing friction in the peritoneal membrane. Plain water in moderate amounts produces almost no stitches, while concentrated drinks produce symptoms in nearly all runners.

Question 3

Can posture affect how often you get stitches while running?

Accepted Answer

Yes, posture plays a major role in stitch susceptibility. A forward-curved or slouched upper spine compresses the upper abdomen and shifts organs against the peritoneal membrane, increasing friction during running. Runners who maintain an extended thoracic spine, lifted sternum, and tall posture typically experience fewer or no stitches.

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The Two-Thousand-Year-Old Pain Beneath the Ribs