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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.
Causes of sudden, severe abdominal pain. Some of the possible causes of sudden, severe abdominal pain include: appendicitis â swelling of the appendix that causes agonising pain in the lower right-hand side of your abdomen. a bleeding or perforated stomach ulcer â a bleeding, open sore in the lining of your stomach. acute cholecystitis â an inflamed gallbladder, often caused by gallstones.