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Causes of Left Side Abdominal (Stomach) Pain. Finding the Cause of Abdominal Pain. Left side abdominal pain may arise from the internal organs of the gastrointestinal and urinary tract, chest, pelvic cavity, abdominal wall muscles, bones (ribs, spine, pelvis), vessels, nerves or skin.
Intense workouts may cause abdominal contractions and side cramps. Menstrual cramps are one common cause of side cramps. Running cramps may be caused by a spasm of the diaphragm muscle. Side cramps can be caused by abdominal exercises. Indigestion from food can cause side cramps.