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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 primary cause of GERD is a compromise of the sphincter where the esophagus enters the stomach. This allows stomach acid to rise up the esophagus, irritating unprotected tissue and causing discomfort. Common causes of sphincter compromise include stomach ulcers, bacterial imbalance, hiatal hernia and stress.