A hernia is tissue from inside the abdomen that bulges out through a weak spot in the muscles of the abdominal (belly) wall. The weak spot may have been present since birth or may develop after surgery or from violent or ongoing coughing, lifting heavy objects, or aging.
There are several types of hernias:
A person with a hernia often feels pain, pressure, or burning or feels like something has given way.
WebMD Medical Reference from Healthwise