Hematuria is one of the common symptoms in urology, and the cause of blood in urine for men depends on the specific situation and whether it is accompanied by other symptoms. Common causes are as follows: 1, inflammation of the urinary tract: in addition to hematuria, it is often accompanied by bladder irritation symptoms such as urinary frequency, urinary urgency, urinary pain, etc. In addition, for older men, it may also be caused by prostatic hyperplasia; 2, urinary stones: in addition to hematuria, there is severe pain in the lower back and abdomen, the pain can be dissipated to the lower abdomen, accompanied by nausea and vomiting; 3, urological tumors: especially bladder cancer, kidney cancer, common in older Men, manifesting as simple hematuria without other symptoms, which is often called painless whole carnal hematuria, this situation should be paid special attention to; 4, the kidney itself medical diseases: such as glomerulonephritis, etc., often appear after the cold hematuria, often accompanied by proteinuria, swelling and other symptoms. Therefore, for men with blood in urine, they should go to the urology department or nephrology department of regular public hospitals for further consultation and treatment in time to discover the cause early.