The organs behind the navel are mainly the small intestine, colon and peritoneum, and most of the pain behind the navel is caused by diseases in these organs. Once there is inflammation in the small intestine, not only will there be pain in the navel area, but also indigestion, bloating, diarrhea and other manifestations. The main role of the colon is to absorb water and promote the formation of stool. When there is pain around the navel, you should be alert to diseases of the colon, such as ulcerative colitis, colon cancer, intestinal tuberculosis, etc. There is a layer of peritoneum behind the intestine, and once the peritoneum becomes inflamed, the patient will not only experience pain, but also have fever and other symptoms.