Side stitches plague up to 70 percent of runners annually, making this sharp abdominal pain one of the most common exercise complaints. Researchers call the condition exercise-related transient abdominal pain, or ETAP. Despite its frequency, the exact cause remains debated among sports medicine experts.
Three leading theories explain why your side hurts during runs. The phrenic nerve, which controls your diaphragm, may become irritated by your breathing pattern. Blood flow around the diaphragm might shift during intense exercise, causing cramping. Poor posture while running can also trigger the pain by straining abdominal muscles.
When a stitch strikes mid-run, several techniques provide relief. Slowing your pace reduces stress on your core. Stretching by raising your arms overhead and leaning toward the opposite side of the pain creates space in your abdomen. Applying gentle pressure to the cramped area while taking deep breaths often eases the discomfort within minutes.
Prevention requires a multi-pronged approach. Practice mindful breathing during training runs, focusing on controlled inhalation and exhalation patterns. Avoid eating large meals or drinking excessive fluids one to two hours before running, as a full stomach increases cramping risk. Strengthening your core through targeted exercises stabilizes your torso and reduces stitch frequency.
Proper posture matters significantly. Running with your shoulders relaxed and your spine aligned reduces unnecessary strain on your abdominal muscles. Stay adequately hydrated throughout the day, not just immediately before exercise. Dehydration can increase your susceptibility to stitches.
Gradual progression in your training prevents sudden physical stress that triggers ETAP. If you're new to running or increasing your mileage, build intensity slowly over weeks. This allows your body to adapt and your breathing to become more efficient.
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