Surgical correction of inguinal hernias is called a hernia repair. Other risk factors include inguinal hernias, Klinefelter syndrome, and mumps orchitis. Most indirect inguinal hernias in the abdominal wall are not preventable. Symptoms may or may not be present in some inguinal hernias. Surgical correction is always recommended for inguinal hernias in children. In 2015 inguinal, femoral and abdominal hernias affected about 18.5 million people. These include inguinal hernias, injury, hydroceles, and varicoceles among others. It is unclear if inguinal hernias are associated with heavy lifting. Symptomatic epigastric hernias are repaired with surgery. This is also where weakness can form, and cause inguinal hernias. Inguinal hernias, in turn, belong to groin hernias, which also includes femoral hernias. About 5% of hiatal hernias are paraesophageal. Most abdominal hernias can be surgically repaired, but surgery has complications. Sliding hernias are the most common type and account for 95% of all hiatal hernias.