An inguinal hernia is a condition defined by the protrusion of internal abdominal tissue or an organ, most commonly a section of the intestine or fatty tissue, through a weakened area in the lower abdominal wall. This typically manifests as a bulge in the groin region, which lies between the lower abdomen and the upper thigh. The primary cause of an inguinal hernia is the weakening of the muscles in this specific area of the abdomen.