“A hernia occurs when part of an internal organ or body part protrudes through an opening into another area where it ordinarily should not be located. There are many different types of hernias, but the most common is when a portion of the intestine protrudes through a weak area in the muscular wall of the abdomen. This causes an abnormal bulge under the skin of the abdomen, usually near the groin or the navel.

Overall, hernias are common, though some types are more common than others. Inguinal hernias affect around 25% of all men. Hiatal hernias affect around 20% of people in the U.S. and 50% over the age of 50. Congenital hernias occur in about 15% of newborns, mostly umbilical. Incisional hernias make up about 10% of hernias, and all other types make up another 10%.

Most aren’t serious, but they can be. They can also become more serious over time. A hernia becomes serious when it gets stuck in the hole that it’s pushed through and can’t go back in. This can become painful, and in severe cases the tissue can become cut off from blood supply, causing necrosis (tissue death). Since hernias tend to worsen over time, most will need surgical repair sooner or later.”

Cleveland Clinic (Hernia: What it is, Symptoms, Types, Causes & Treatment)