The symptoms of vague pain in the stomach are mostly considered to be digestive system diseases, and the common causes include chronic gastroenteritis, intestinal mucositis and colorectal cancer. Because the abdomen is a concentrated area of digestive system tissues, pathological changes in local organs and tissues may cause ulcerative damage or infiltrative damage to the surface mucosa and internal tissues, which may cause continuous pain when the patient is stimulated by gastrointestinal fluid or external substances. Patients with this condition also suffer from loss of appetite, diarrhea, watery stools, black stools, pus and other adverse symptoms. However, the possibility of cystitis, abdominal aortic aneurysm, localized neurological injury, etc., is not excluded, because in addition to the digestive system, there are other systems in the abdomen, such as the urinary system, the blood system, the nervous system and other tissues.