If you have pain in the abdomen after urination, it is recommended that you go to the hospital for relevant examinations to clarify the possible causes: 1. Acute urethritis or cystitis, you can have pain in the abdomen after urination, accompanied by symptoms such as urinary frequency, urinary urgency, painful urination, etc. Serious patients may have blood in the urine. Pain in the small abdomen after urination, and may also appear as straining to urinate or interruption of urination, serious patients can also appear flesh-eye hematuria, can be accompanied by urinary frequency, urinary urgency and other urinary tract irritation symptoms, need to carry out ultrasound examination of the urinary system to exclude the presence of stones; 3, when suffering from bladder tumor, bladder polyps can also appear pain in the small abdomen after urination, can also be manifested as bright red flesh-eye hematuria, tumor volume is small abdominal pain is not obvious, but with When the tumor volume is small, the pain is not obvious, but with the increase of tumor volume and local compression, the pain can be gradually aggravated, and it can also be persistent pain.