What to do if I have severe left lower abdominal pain?

Abdominal pain. Severe abdominal pain should be evaluated in the emergency room. The most likely causes are constipation or diverticular disease although intestinal obstruction is also possible. If female, then ovarian issues could cause pain. At the emergency room, bloodwork, abdominal xrays and a ct scan of the abdomen and pelvis would most likely be completed and should give the diagnosis and treatment.