A hernia is a condition in which part of an organ protrudes through the muscle wall. Common hernias include inguinal hernias (hernia in the groin), umbilical hernias (hernia at the belly button), ventral hernias (refers to hernias in the front of the abdomen), incisional hernias (hernias that are present from prior abdominal incisions), epigastric hernias (hernia in the upper middle of the abdomen