There are six common types of hernias. Inguinal hernia occurs in the inner groin. Femorial hernia happens in the outer groin and upper thigh. Incisional hernias develop through a scar in the abdomen. Ventral hernias are in the abdominal or ventral wall. Hernias at the belly button area are called Umblicial. Hiatial hernias happen along the upper stomach inside the abdomen.