Below the belly button is a little hard and throbbing, which can be seen in thin people, but also to consider intestinal distension, intestinal obstruction, abdominal aortic aneurysm, intestinal tumors and other possibilities. Thin people can feel the abdominal aortic pulsation around or below the navel, if the pulsation is regular, to consider the possibility of this; if the pressure has pain and pulsation is obvious to exclude the possibility of abdominal aortic aneurysm, the need to do further abdominal aortic ultrasound to assist in the diagnosis. Functional dyspepsia, gastrointestinal flatulence, physical examination will also appear abdominal fullness, gastrointestinal accumulation of gas caused by a little hard below the navel, functional problems can be relieved after dietary adjustments and disappearance of the symptoms. The existence of intestinal obstruction, the contents of the intestinal tract retention will also appear below the navel touch hard, reflexive throbbing, such as the combination of vomiting, abdominal pain, stop defecation and exhaust symptoms, to consider the possibility of intestinal obstruction, the need to go to the hospital as soon as possible to do imaging and other related tests to make a clear diagnosis. Colonic space-occupying lesions, such as tumors, can also cause the navel to become hard to touch, and may be accompanied by abdominal pain, change in stool pattern, occult blood and other symptoms. These are only some of the common causes. If the symptoms persist, it is necessary to go to the gastroenterology department of the hospital for further colonoscopy and other related tests to make a clear diagnosis, and follow the doctor’s instructions to standardize the treatment.