Hematuria is one of the common clinical symptoms. Hematuria in men may be caused by the following: i. Inflammation, in addition to hematuria, is often accompanied by frequent urination, urinary urgency, and painful urination, which is considered to be a urinary tract infection. If it is also accompanied by progressive difficulty in urination, incomplete urination, weakness in urination, thin urine line, for older male patients, it may be caused by prostate enlargement. If a young or middle-aged man also has perineal swelling and pain, fever, etc., it may be caused by acute prostatitis. Second, urinary stones, in addition to hematuria, are accompanied by severe pain in the lower back and abdomen, accompanied by nausea and vomiting, etc. Third, if it is only hematuria without other obvious symptoms, that is, painless carnal hematuria, for elderly people, they should be especially careful, it may be urinary tract tumor, commonly bladder cancer, some may also be renal pelvis cancer and kidney cancer. Fourth, it may be caused by diseases of the kidney itself, such as nephritis or taking anticoagulant medication, accompanied by internal diseases, such as hypertension, blood disorders, immune system diseases, etc. Therefore, men with hematuria should still go to the urology department or nephrology department of a regular hospital for further examination to clarify the cause.