A movement of one part of the body into another part through an abnormal opening or an opening that is unusually large. Hernias often result in an unsightly, and sometimes painful, bulge outside the body. In some cases, the hernia can be pushed manually back into place inside the body. In others, this is not possible. If not treated, hernias tend to increase in size. In the more serious cases, blood supply can be affected causing sections of the bowel to die. Then, abdominal contents can leak out, resulting in infection and serious complications.