The common cause of pain in the lower left corner of the belly is infection, which occurs in the pelvic cavity or cystitis, etc. Pain can also occur, as well as fever, and in severe cases, pelvic effusion, which requires systematic anti-infective treatment. The actual fact is that you will be able to get a good deal of time and effort to get a good deal of time and effort. In addition, colitis is a disease that occurs mainly in the rectum and sigmoid colon, the patient will have pain during the attack, usually there will be obvious abdominal distension, there will be blood in the stool, or mucus-purulent stool, repeated attacks will also lead to the loss of nutrients, the patient will lose weight, fiber colonoscopy can be clearly diagnosed, in ordinary times should pay attention to a light diet, away from stimulating food, regular Regular checkups should be performed.