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.
Irritable bowel syndrome. Irritable bowel syndrome (IBS) is a disorder that leads to abdominal pain and bowel changes. IBS is not the same as inflammatory bowel disease (IBD). The reasons why IBS develops are not clear. It can occur after an infection of the intestines. This is called postinfectious IBS. There may also be other triggers, including stress. The intestine is connected to the brain using hormone and nerve signals that go back and forth between the bowel and the brain. These signals affect bowel function and symptoms.