Hematuria in children should be taken seriously, hematuria is one of the most common manifestations of urological disorders in pediatrics, and the common causes of hematuria are urinary tract infection, urinary stones, kidney diseases, etc. 1. Urinary tract infection: urinary tract infection is usually accompanied by frequent urination, urinary urgency and diabetes. 2. Urinary stones: in addition to hematuria often accompanied by low back pain, abdominal pain and other symptoms, abdominal ultrasound or urological plain film or CT helps to check. 3. Kidney disease: divided into kidney disease, glomerulonephritis and so on. It is recommended to first determine the cause of blood in the urine, so it is necessary to check the urine routine, color Doppler ultrasound of the urinary system to find out the cause and then treat the symptoms. In addition problems such as trauma, systemic blood system diseases, and even tumors may also lead to hematuria. Once a child develops persistent hematuria, parents should take the child to the hospital as soon as possible so as not to delay treatment.