Left mid-abdominal pain can be caused by diseases of the descending colon, left kidney, ureter and other organs. Since visceral sensation is different from skin and the location of visceral pain is more ambiguous, left mid-abdominal pain is most likely to be related to diseases of the above organs. If there is any pain or other discomfort, it is recommended to consult a doctor promptly to avoid delay in treatment. 1. Kidney: Kidney stone, renal infarction, pyelonephritis, renal rupture, etc., which can be accompanied by left lower back pain and left mid-abdominal pain. 2. Ureter: ureteral stones, etc. 3. Intestinal tract: colon tumor, colitis, diverticulitis, small intestine with enteritis, intestinal obstruction and other diseases. 4. Skin and muscle injuries and neuropathy in the left mid-abdomen can also cause insidious pain in the left mid-abdomen. If there is insidious pain in the left mid-abdomen, you need to go to the hospital for laboratory tests, abdominal ultrasound, gastroenteroscopy, abdominal CT and other tests. If necessary, a thorough examination is needed. Ask your doctor to determine the cause of the condition to avoid delaying treatment.