A bulge in the navel after gallstone surgery may be an incisional hernia. After gallstone surgery may be due to long-term application of hormones, immunosuppressive drugs or advanced age, malnutrition, hypoproteinemia, anemia, diabetes mellitus and obesity, resulting in poor healing of the incision, appearing as a bulge in the belly button incision from which intra-abdominal organs and/or tissues protrude outward. It is also possible that the inflammatory reaction of the incision makes the healed scar tissue tensile strength decrease, and the internal organs may also protrude from the middle when the pressure in the abdominal cavity increases. After gallstone surgery there is a bulge on the navel should go to a regular hospital, by the doctor according to the symptoms, signs and ultrasound, CT examination to determine the specific cause of the disease, for the cause to give the correct treatment.