A hernia occurs when part of an organ (usually the intestines) protrudes through a weak point or tear in the thin muscular wall that holds the abdominal organs in place.

There are several types of hernias, based on where it occurs:

• Inguinal hernia -- appears as a bulge in the groin or scrotum. This type is more common in men than women.
• Femoral hernia -- appears as a bulge in the upper thigh. This type is more common in women than in men.
• Incisional hernia -- can occur through a scar if you had abdominal surgery.
• Umbilical hernia -- a bulge around the belly button. Happens if the muscle around the navel doesn't close completely.

Usually, there is no obvious cause of a hernia, although they are sometimes associated with heavy lifting.

Hernias can be seen in infants and children. This can happen when the lining around the abdominal organs does not close properly before birth. About 5 out of 100 children have inguinal hernias (more boys than girls). Some may not have symptoms until adulthood.

If you have any of the following, you are more likely to develop a hernia:

• Family history of hernias
• Cystic fibrosis
• Undescended testicles
• Extra weight
• Chronic cough
• Chronic constipation, straining to have bowel movements
• Enlarged prostate, straining to urinate

• Groin discomfort or groin pain aggravated by bending or lifting
• A tender groin lump or scrotum lump
• A non-tender bulge or lump in children

A doctor can confirm the presence of a hernia during a physical exam. The mass may increase in size when coughing, bending, lifting, or straining. The hernia (bulge) may not be obvious in infants and children, except when the child is crying or coughing.