Pain in the left side of the navel for two months may be caused by small intestinal lesions, colon lesions, urinary system diseases, etc. It is recommended to consult a doctor in a timely manner to find out the cause of the disease and follow the doctor’s instructions for treatment. 1. Small bowel lesions: some small bowel diseases, such as inflammation of the small bowel, small bowel tumors, etc., may lead to symptoms of pain in the left side of the navel for two months, you can carry out colonoscopy, abdominal CT and other tests. 2. Colon lesions: anatomical location of the colon on the left side of the navel, generally descending colon, descending colon common lesions, such as ulcerative colitis, descending colon tumors, etc., may cause pain on the left side of the navel for two months, at this time, it is recommended to perform colonoscopy. 3. Urological diseases: when the left side of the kidney, ureter and other diseases caused by kidney or ureteric fluid, it is likely to occur in the left side of the navel pain symptoms for two months, CT, ultrasound and other tests. The left side of the navel pain may also be other reasons, it is recommended that timely medical treatment, so as not to delay the condition.