In men, vague pain on the left side of the abdomen is generally considered to be a gastrointestinal tract disorder caused by irregular diet or eating cold food. For this kind of patients need to pay attention to the diet, generally can be self-healing. In addition, colitis can also cause symptoms of left-sided abdominal pain, these patients are usually accompanied by diarrhea, bloating symptoms, need to go to a regular hospital for examination, under the guidance of doctors, oral anti-inflammatory drugs and immune regulating drugs for treatment. The majority of patients with colitis are young men, because it is an autoimmune disease, so in daily life, pay attention to their own body, a light and healthy diet, regular work and rest, can effectively avoid the occurrence of such diseases. When elderly men have vague pain on the left side of the abdomen, it is not excluded that there is a tumor in the colon or rectum, and these patients also have symptoms of irregular bowel movements and inability to eat. The elderly patients with such symptoms must go to a regular hospital for examination in time to find out the cause and treat the symptoms under the guidance of a doctor.