A swollen bag in the navel is considered to be related to umbilical hernia, infection in the navel, lipoma and other causes. 1. Umbilical hernia: such as cirrhosis, ascites, previous laparoscopic surgery in the umbilicus part of the suture effect is poor, can lead to high intra-abdominal pressure or abdominal wall strength weakening, easy to make the abdominal cavity large omentum, intestinal tubes, etc. to the abdominal wall weak parts of the body surface protruding, which can be manifested as a swollen umbilicus a bag. 2. Navel infection: when the navel infection and lead to abscess, can lead to the phenomenon of a swollen navel. At this time, you need to incise and drain the way for treatment, to be thoroughly drained, the wound will gradually re-heal. 3. Lipoma: belongs to a kind of superficial benign tumor. It usually occurs in the limbs and trunk, which can lead to a swollen bag in the navel. When the tumor is small, no treatment is needed. However, if the tumor is large, it can be surgically removed. When the umbilicus is swollen a bag, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for targeted treatment.