Clarissa Brincat is a freelance writer specializing in health and medical research. After completing an MSc in chemistry, she realized she would rather write about science than do it. She learned how to edit scientific papers in a stint as a chemistry copyeditor, before moving on to a medical writer role at a healthcare company.
We've all been there — you're just starting to find your running rhythm on the treadmill, or maybe you're hustling to catch a train, when you're suddenly struck by a sharp pain in your side, just under your rib cage.
For decades, after this theory was first proposed in 1941, scientists and sports doctors believed that a side stitch is caused by inadequate blood flow to the diaphragm, the large muscle that sits under the ribs and draws air in and out of the lungs. This lack of blood could cause a painful cramp or spasm. This idea was based on the theory that blood travels away from the diaphragm and concentrates in the muscles of the limbs when we exercise.
By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.Some have suggested that having a poor fitness level may raise the risk of side stitches, but Lavender questions this idea because highly trained athletes also get these pains. Still other scientists have proposed that the pain of a stitch stems from the intestines, as a result of poor blood flow to the gut during exercise.
Nowadays, peritoneum irritation is thought to be the source of the pain we think of as a side stitch, Lavender said. This theory is supported by the fact that side stitches become more likely if you eat or drink right before exercise. When your stomach is full, it pushes against the peritoneum, forcing its two layers closer together and increasing friction between them, the authors of the 2000 study wrote.
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