Umbilical

An umbilical hernia is a weakness that develops in the abdominal wall through and around the belly button, called the umbilicus. A bulge or sac containing fat or intestine pushes out through that weakness, sometimes causing an "outie" belly button. Most patients with umbilical hernias first notice a belly button bulge or discomfort. Over time these hernias can get larger and more uncomfortable as the hernia sac gets pushed out from inside the abdomen. 

Umbilical hernias carry the risk of becoming stuck or “incarcerated,” which could cause strong pain, nausea, vomiting, or the inability to pass gas from the rectum. This is an emergency, and if this happens, you should contact your doctor immediately or go to the emergency room.