My lower left side of my abdomen. hurts what could it be?

Abdominal Pain: Most often first thought is diverticulitis or diverticulosis. Sharp, stabbing, lower left abdomen. If not sure best to be seen by a doctor because it could also be abscess, infection, bowel torsion, etc...

Many things : Many different things may lead to left lower abd pain. Commonly it involves disorders of the colon. It may be as benign as gas / pain or serious conditions such as diverticulitis or even malignancy. You should see a physician.

Many possibilities: Could be gastrointestinal (gi), urologic or gynecologic. Some of this depends on your age and what makes your symptoms better or worse. From a GI standpoint, does moving your bowels make your symptoms better or worse? Does eating affect symtoms? Is there a change in your bowel pattern? Weight loss? Blood in the stool? If any of these are present, it is likely the problem is GI in origin.