The first is due to urinary tract infection, accompanied by frequent and urgent urination, and requires a routine urine test at the hospital. Second, due to urethral stones, urethral stones can cause stinging pain after urination and blood, accompanied by poor urination, can be found through the urinary ultrasound bladder or rear urethra stones, can be clearly diagnosed. Thirdly, due to malignant tumor in the urethra, the above symptoms will also appear, and cystourethroscopy is needed to make a clear diagnosis.