The following diseases are commonly seen with hematuria: i. Urinary tract infections and urinary stones. In addition to hematuria, these diseases are usually accompanied by symptoms such as urinary frequency, urinary urgency, urinary pain and lumbago. Some patients can be accompanied by fever, chills and other systemic symptoms. Second, urological tumors, mostly appearing in middle-aged and elderly people. Third, various kinds of nephritis, especially IgA nephropathy, are prone to recurrent episodes of hematuria after infection. Fourth, certain systemic diseases, such as hematological system diseases, coagulation disorders, and overdose of application of certain anticoagulant drugs, such as aspirin and warfarin, etc. Certain physiological conditions are also prone to hematuria, such as strenuous exercise, cold and fever, when hematuria is usually transient. To identify the source of hematuria, you need to go to the hospital for routine urine tests, urological ultrasound, and if necessary, erythrocyte phase contrast morphology, urological CT, or cystoscopy.