An<unk>  is a health condition where the abdominal wall behind the navel is damaged. It may cause the navel to bulge outwards—the bulge consisting of abdominal fat from the greater omentum or occasionally parts of the small intestine. The bulge can often be pressed back through the hole in the abdominal wall, and may "pop out" when coughing or otherwise acting to increase intra-abdominal pressure. Treatment is surgical, and surgery may be performed for cosmetic as well as health-related reasons.
Umbilical hernia
Paraumbilical hernia
Omphalocele
Rectocele
Umbilical granuloma
Retrocolic hernia
Spigelian hernia
Persistent cloaca