Generally, urinary bleeding in men may be caused by urethral stones, metastasis of malignant tumors, kidney diseases and so on. 1. Urethral stones: when the stone is stuck in the ureter or urethra, it is easy to cut through the wall of the tube, thus causing bleeding. If the stone is stuck in the ureter, it will cause back pain, nausea and vomiting. If the stone is stuck in the urethra, it will easily cause urethral pain and discomfort. 2. Metastasis of malignant tumor: malignant tumor patients may have metastasis in kidney, bladder, ureter and other parts in the late stage, and metastasis will cause blood in urine if it destroys blood vessels. 3. Kidney diseases: common kidney diseases include glomerulonephritis, etc. Due to the kidney lesions, the red blood cells inside the blood gush into the urine, which can easily cause urinary bleeding. In addition, male urinary bleeding can also be seen in other diseases, it is recommended that patients go to the hospital in a timely manner, follow the doctor’s instructions for treatment.