The stomach is always vaguely painful, consider the following causes: First, intestinal tumors, especially large intestinal lesions, usually there will be pain, because the development of tumors easily involved in the plasma membrane, patients in pain at the same time there will also be obvious abnormal bowel movements, unshaped stools or blood in the bowel movements, serious will also appear obstruction, usually there will also be diarrhea and constipation alternately, there are many patients are due to a Many patients have a history of polyps, which are easy to ignore and need to undergo colonoscopy and other examinations when necessary. Second, patients with ulcerative colitis, more often seen in young people, is a common inflammatory disease of the intestines, after eating unclean food will lead to the aggravation of symptoms, should pay attention to dietary regimen, regular colonoscopy.