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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 most common causes include the following: 1  Urinary tract infection. 2  Side effect of medication: Examples include alpha-blockers, calcium channel blockers, antidepressants, antihistamines, sedatives, sleeping pills, narcotics, caffeine-containing preparations, and water pills (diuretics).