Men with blood in the urine, there may be urinary tract infection, trauma, urinary stones (tumor), blood diseases and other reasons. 1. Urinary system infection: acute cystitis, urethritis, seminal vesiculitis, prostatitis and other infectious diseases, may cause urethral congestion, capillary rupture, resulting in men with blood in the urine. 2. trauma: penis or abdomen by external pressure, bumps and other factors, may also cause the urethra blood vessel rupture, which leads to men have blood in urine. 3. Urinary stones (tumors): ureter, stones, kidney stones, bladder cancer, prostate cancer and other diseases can also cause men to have blood in urine. 4. Blood diseases: hemophilia, leukemia, thrombocytopenia, etc. affect the normal blood clotting function, may also lead to men with blood in urine. There may be other reasons for men to have blood in urine, so it is recommended to go to the hospital in time for examination and treatment according to the doctor’s prescription.