Your lower left abdomen is known a your iliac or lumbar region. "Suffering from lower left abdominal pain can go both ways. On one end it could be absolutely nothing at all, but a small gas build-up in your intestines (trapped wind,) constipation, or as a result of hard exercise (stitch on the side.) All you would need are simple medication and rest to make the pain go away. But on the other hand, it could also be an indication of a graver medical condition. According to health care providers, people who complain of lower left abdominal pain could be in danger of: bowel cancer, Crohn’s disease, ectopic pregnancy, food poisoning, and hernia, to name a few". hope this helps -Nat

It could be diverticulitis, which can be quite painful. This small pockets in your bowel which get infected. If you have that, the doc will give you some medicine for the infection and a low bulk diet for a week or two. It could be a problem with ovaries on that side. Both can become life threatening if they get worse. It could be a kidney stone if it is higher and to the back. Please visit your friendly doc for a proper diagnosis