The main causes of constant pain on the left side of the navel include flatulence, inflammation of the intestines, polyps and neurosis. This organ has small intestine, transverse colon, etc., the possibility of cancer is small. 1. Intestinal flatulence: because of cold or improper diet can cause local intestinal flatulence, causing the place often have hidden pain, exhaust, defecation can be relieved on their own after. 2. Intestinal inflammation: mainly associated with infections such as bacterial enteritis and the immune system, such as ulcerative colitis, intestinal Crohn’s disease, etc., because of intestinal mucosal thickening, edema, often with hidden pain, accompanied by abnormal defecation. 3. Polyps: polyps in the intestinal tract can cause hidden pain, local mucosal ulceration or peripheral irritation, can also cause blood in the stool and other symptoms. 4. Neurosis: there is no organic lesion in itself, but it will cause corresponding symptoms after mental tension and anxiety. The left side of the navel often has hidden pain, also can not completely exclude the possibility of cancer. As the main organs in this place are small intestine and transverse colon, small intestine cancer is very rare, and transverse colon cancer can not be ruled out completely. In addition, due to the inability of visceral nerves to localize the pain, there is also the possibility of tumors in other organs, such as renal cancer, pancreatic cancer, and so on. Therefore, if you have recurring pain on the left side of navel, you should consult a doctor in time, complete the examination, make a clear diagnosis, and carry out standardized treatment under the guidance of clinicians.