Pain in the middle of the navel is often caused by the following reasons: 1, bladder disease, such as congestive cystitis, bladder polyps or malignant tumors, sometimes also due to overfilling of the bladder, can go to the hospital urology department for examination, need to check the blood routine, urinary routine, ultrasound of the bladder or lower abdominal CT, according to the results of treatment. 2, may be caused by acute enteritis, when eating too much inappropriate food or drinking alcohol, can appear acute enteritis, then need to actively adjust the diet structure, if necessary, you can take oral antispasmodic drugs and regulate the intestinal flora drugs for treatment, sometimes can be hot compresses. 3, if women, may be caused by gynecological diseases, such as uterine fibroids, adenomyosis, etc., need to check the gynecological ultrasound and so on.