A hernia occurs when an organ in the abdomen displaces due to the weakening of the muscles that surround the particular organ. There are several causes of hernia. Some of them are- consuming tobacco, smoking, poor nutrition, chronic constipation, etc. A hernia can occur in the abdomen, upper thigh area, belly button, or groins. Although rare, a hernia can occur in an infant also due to the weakness in the muscles during birth, but in general, it occurs later in life.