Adults with bulging meatballs in the navel may be due to umbilical hernia, navel inflammation or intestinal obstruction and other diseases. 1. Umbilical hernia: Umbilical hernia is usually caused by a defect in the tissue under the umbilicus, which allows the patient’s small intestine, contents or other organs to enter the damaged area, resulting in a bulge of meatballs in the navel. Often patients also accompanied by abdominal pain. 2. Umbilicitis: Umbilicitis is usually due to Staphylococcus aureus infection, adults with umbilicitis will cause swelling, itching, hot and humid umbilical region. Some patients also have erosion around the navel, as well as emit a bad odor. 3. Intestinal obstruction: Intestinal obstruction can also cause the adult belly button protruding meatballs, which is mainly due to intestinal obstruction, so that the abdominal cavity to form a greater pressure, resulting in the protrusion of the navel area. Adult belly button protruding meatball also seen in other causes, it is recommended to consult a doctor in a timely manner, under the guidance of a professional doctor to standardize the treatment, to avoid delays in the condition.