If the stomach hurts when urinating, then the possible causes: a. Suffering from urinary tract infections, such as cystitis, urethritis, can appear pain in the lower abdomen when urinating, accompanied by frequent urination, urinary urgency, stinging pain in urination, accompanied by a sense of incomplete urination. Severe patients may also have symptoms of hematuria in the naked eye, or fever. Routine urine tests and urine culture tests are needed to further confirm the diagnosis. Second, the presence of bladder or urethral stones can cause pain in the urethra or small abdomen when urinating. If the stone is located in the bladder, it may block the urethral orifice with the flow of urine during urination, and interruption of urination may occur. After changing position, normal urination can be resumed. Ultrasound examination of the urinary system is needed to confirm the presence of urinary stones. Third, bladder tumors can cause pain in the abdomen during urination. Patients often have a history of hematuria, and CT examination of the bladder area is needed to rule out bladder tumors.