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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 cause of abdominal pain for a woman with a regular menstrual cycle is abdominal cramps; however, you mention that you are not on your period right now. The other causes of one sided abdominal pain in a woman are conditions affecting the ovaries such as cysts or torsion. They can cause one sided abdominal pain or cramping. Another possibility is a urinary tract infection. A urinary tract infection can migrate up the the kidneys and cause one sided back pain. It is also usually associated with fevers. Another possibility is constipation.