An umbilical hernia is a bulge that appears at the belly button. It occurs when the abdominal wall muscles do not close around the hole left by the umbilical cord. Pressure within the abdomen can cause part of the intestines or tissue to push through the opening, creating a bulge. Umbilical hernias are common in children, but adults can also develop them. The hernias typically resolve independently as a child ages. However, surgery may be necessary for adults and older children with larger or painful hernias. When the umbilical cord forms, it creates a hole in the abdominal wall that later becomes a belly button. When fatty tissue or part of the intestines pushes through this hole, it causes a bulge at the belly button called an umbilical hernia. Pressure in the abdomen can result in an umbilical hernia. Laughing, crying, and coughing can cause this pressure in infants and children. For adults, the pressure may result from chronic coughing, physical strain, or pregnancy with more than one baby. The main symptom of an umbilical hernia is the characteristic lump at the belly button. The lump is generally painless in infants and young children. It can change in size as the pressure in the abdomen comes and goes. Adults with umbilical hernias may not experience any symptoms except mild discomfort if the hernias are small. However, as the hernias increase in size, both adults and children can experience pain, skin discoloration, and symptoms of intestinal obstruction. Symptoms of obstruction can include nausea and vomiting. Umbilical hernias in infants or children under age 5 may not require any treatment. Surgery may be necessary for children older than age 5 and adults who are experiencing complications. Surgery in children typically involves closing the abdominal hole with stitches. For adults or older adolescents with larger hernias, a mesh can help support the abdominal wall(UMBILICAL HERNIOPLASTY). This mesh can reduce the chances of the umbilical hernia recurring.