The pain in the belly when urinating requires further examination at the hospital to clarify the possible causes: 1, cystitis, which can cause pain in the small abdomen when urinating, accompanied by painful urination, incomplete urination and other symptoms, which is due to inflammation leading to congestion and erosion of the bladder mucosa, with the process of pressure changes in the bladder mucosal irritation and cause pain. For example, pain in the small abdomen can occur when holding urine or during urination. 2. Bladder stones, during urination, stones can cause irritation of the mucosa with the flow of urine, resulting in pain. 3. Tumors, polyps and other lesions in the bladder can cause local mucosal destruction, which can cause local pain or urine bleeding during urination, requiring cystoscopy to clarify.