Pain when getting up from the lower left side of the abdomen may be related to muscle strain, intestinal inflammation or intestinal tumor, left ureteral stone, left adnexitis (female) and other diseases. 1. Muscle strain: muscle injury caused by excessive exercise, heavy physical labor or improper exertion will cause pain and discomfort if the muscle is pulled when getting up. 2. Enteritis or intestinal tumor: when the mucosa of the left half of the intestinal lumen is congested and edematous due to various reasons or when there is tumor lesion, it will also be manifested as pain and discomfort in one side of the abdomen. 3. Ureteral stones on the left side: due to the obstruction of stones in the ureter, causing irritation to the wall of the ureter, which will produce one side of the lower back and abdominal pain. 4. Left-sided adnexitis: adnexitis is a relatively common gynecological disease, due to the infection leads to local tissue adhesion, after the activity will appear pulling pain. As there are many causes of pain, the specific situation needs to be analyzed by a doctor’s interview and laboratory results.