WHAT YOU NEED TO KNOW: An umbilical hernia is a bulge through the abdominal muscles in the area of the navel (belly button). The hernia may contain tissue from the abdomen, part of an organ (such as the intestine), or fluid. Umbilical hernias usually happen because of a hole or a weak area in the muscles of the abdominal wall. This can happen at any age. Umbilical hernias happen more often in women than in men. You may be more likely to have a hernia if other family members have them.
In this article. The cause of the inflammatory bowel diseases (IBD), ulcerative colitis, and Crohn's disease, is not known. Studies suggest they are caused by a combination of things, including genes, environmental factors, and problems with the immune system.
The exact cause of irritable bowel syndrome is unknown. It is believed to be due to a number of factors, including alteration in the gastrointestinal (GI) tract motility, abnormal nervous system signals, increased sensitivity to pain, and food intolerances. The following are risk factors thought to cause IBS: 1  Abnormal movements of the colon and small intestines (too fast or slow, or too strong) 2  Hypersensitivity to pain from a full bowel or gas. 3  Food sensitivities, possibly caused by poor absorption of sugars or acids in food.