Pain in the lower left side of the stomach can be seen in many diseases, may be ureteral stones, ulcerative colitis or sigmoid descending colon tumor, need to be combined with clinical symptoms to diagnose, can carry out fiber colonoscopy and pathological examination to confirm the diagnosis, usually pay more attention to diet, diet is light, can drink more water, appropriate physical exercise. If it is a stone, extracorporeal lithotripsy or lithotomy should be performed if necessary. If it is a woman, gynecological diseases are not excluded, so we must pay attention to this situation and go to the hospital for examination and treatment as soon as possible, so as to reduce the pain caused by the disease. The early detection and early treatment, attention to diet and rest during the disease, keep a happy mood, regular rest, can help to relieve the disease, as soon as possible to get rid of the torture of the disease, restore health.