There are several reasons for the vague pain on the left side of the belly button: first, consider enteritis, intestinal obstruction, intestinal flatulence, gastrointestinal dysfunction and constipation and other intestinal diseases. Second, there is no muscle strain, such as rectus abdominis muscle, the left rectus abdominis muscle strain can also lead to vague pain in the left side of the abdomen. Third, there is no skin herpes zoster, some elderly comrades in the abdomen herpes zoster, herpes zoster is not completely issued in the skin under the phenomenon of pain. In addition, the left side of the abdominal pain should also consider the presence of left ureteral stones, to the hospital for urine tests and ultrasound examination to make a clear diagnosis.