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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.
A side stitch causes an intense, stabbing pain under the lower edge of the ribcage and although it can occur on both sides of the abdomen, research has found that it occurs more frequently on the right side. The pain is usually brought on by vigorous exercise and activity. Side stitches occur more frequently in sports that require a lot of up and down movement, like running, jumping and horse riding. They also occur more frequently in novice or amateur athletes.