The left side of the belly button is hard and throbbing when pressed may be touching the intestinal dry stool, intestinal tumors, abdominal aortic aneurysm, and so on. 1. Touching the bowel dry stool: if the patient’s abdominal fat is less, just press to the sigmoid colon at the dry stool and abdominal aortic pulsation, there will be hard and a jumping feeling. 2. Intestinal tumor: due to the formation of intestinal occupation mass, when the intestinal tumor is more rich in blood vessels, when pressed to the intestinal tumor, there can be hard and a jumping sensation. 3. Abdominal aortic aneurysm: this disease is mainly caused by abdominal trauma, infection and other reasons, with the fluctuation of blood vessels, patients will have hard and throbbing sensation when pressing to the abdominal aortic aneurysm. The left side of the belly button press hard and a jump may also be other reasons, need to timely to the specialist, follow the doctor’s advice systematic treatment.