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.
1 IBS occurs in 5% to 20% of children. 2  IBS also has developed after episodes of gastroenteritis. 3  It has been suggested that IBS is caused by dietary allergies or food sensitivities, but this has not been proven.  Genetics also is suggested as a potential cause of IBS, but so far a hereditary link has not been found.