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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.
What Causes a Side Stitch? The pain is caused by a spasm of the diaphragm muscle. The diaphragm is a dome shaped muscle that separates the thoracic (lung) cavity from the abdominal cavity and moves up and down when you inhale and exhale.