1. An umbilical hernia is a protrusion of abdominal contents through the abdominal wall near the umbilicus.
2. It can be congenital, due to incomplete closure of the umbilical ring, or acquired later in life due to risk factors like obesity, pregnancy, or ascites.
3. Physical exam reveals a soft, reducible mass at the umbilicus that increases in size with straining; complications include incarceration or strangulation which require surgery.