The bag in the navel hurts when pressed may be umbilical hernia, abdominal aortic aneurysm, intestinal obstruction, etc., and you need to go to the hospital in time to identify the disease and then treat it. 1. Umbilical hernia: Umbilical hernia is an extra-abdominal hernia in which the contents of the abdominal cavity protrude from the umbilicus at a weak point, and the incidence of this disease is higher in infants. Congenital developmental abnormalities, obesity, abdominal trauma, ascites and other factors can lead to the occurrence of umbilical hernia, the patient often shows abdominal mass, coughing or crying can be aggravated, often accompanied by abdominal pain, vomiting and other symptoms. 2. Abdominal aortic aneurysm: Abdominal aortic aneurysm refers to the permanent expansion of the abdominal aorta, usually the diameter of the aorta is more than 50% larger than normal defined as aneurysm. The aneurysm can be ruptured when the patient’s blood pressure rises, coughing hard, or heavy physical labor. The main symptoms are abdominal pain, pulsatile abdominal mass, numbness of limbs, etc. 3. Intestinal obstruction: Intestinal obstruction occurs when intestinal contents are discharged for various reasons, and the main symptoms are nausea and vomiting, abdominal mass, and anus stops defecation.