If you have pain in your stomach during urination, you may have cystitis or have bladder stones, bladder tumors and other diseases. If the pain is recurrent or lasts for a long time, accompanied by hematuria, painful urination, or accompanied by frequent urination, urinary urgency, etc., you need to go to the hospital for examination: 1. When acute cystitis occurs, the bladder mucosa is acutely congested and edematous, and pain can occur with increased bladder tension in the process of holding urine, and in the process of urination, the pressure in the bladder drops sharply, and the mucosal crinkling can also occur with small abdominal pain and painful urination 2, when there are bladder stones, the stones flow with the urine during urination, stimulating the bladder mucosa to produce symptoms of small abdominal pain, and may also be accompanied by bleeding in urination and other manifestations; 3, if there is a bladder tumor, it may cause hidden pain in the small abdomen during urination, and may also cause persistent pain or bleeding and other manifestations when holding urine or not urinating, which requires further Cystoscopy should be performed to clarify.