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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.
The second cause of side stitch is probably the most common. It's a stretching of the ligaments attached to the liver, pancreas, stomach, and intestines. These ligaments are put under stress when you walk vigorously. The bouncing action causes them to stretch, thereby causing pain.