Tightening pain in the stomach is called abdominal cramps, the main consideration of the following aspects of the cause: 1, may be due to dietary hygiene, eat a bacterial infection of food or spoiled, expired food caused by toxins, mucosal stimulation and thus the formation of gastrointestinal spasms will appear abdominal cramps. 2, consider parasitic infection of the intestinal tract has a parasite, the parasite activity of intestinal stimulation, the occurrence of the drilling-like pain, the common The common parasites are roundworms.3. Considering dysmenorrhea, women will have severe abdominal pain before and during menstruation, mainly due to the pain caused by endometrial shedding or due to endometriosis.4. Perforation of the intestinal tract due to various aspects, common intestinal ulcers, parasites, and ulcerative colitis, when there is a perforation of the local stimulation leads to severe pain.