There is blood after urination, which belongs to the condition of bleeding at the end of urination. This symptom may be caused by the injury of bladder neck, bladder triangle or internal orifice of urethra. The most common causes are cystitis, urethritis, and male prostatitis. In order to make a clear diagnosis, routine urine tests can be performed. If the white blood cells are significantly higher, cystitis and urethritis can be diagnosed. At the same time, male patients need to do prostate B-ultrasound prostate fluid analysis to make a clear diagnosis. After a clear diagnosis, timely treatment will be given according to the cause of the disease. After the inflammation improves, the symptoms of blood after urination will also improve.