Routine urine examination, if it is found to contain blood, it is called hematuria and further examination is needed to clarify the cause of hematuria. Possible causes: 1. Urinary tract infection, which can be manifested as hematuria when there is acute congestion and edema of the mucosal epithelium, accompanied by a little bleeding, mixed with the urine. This is also accompanied by urinary tract irritation symptoms, such as urinary frequency, urinary urgency, painful urination, etc. Routine urine examination, in addition to the presence of blood, is also accompanied by an elevated white blood cell count and bacterial count for identification.2. The presence of stones in the urinary system, such as kidney stones, bladder stones, urethral stones, etc., may result in local mucosal rupture and bleeding, followed by a urinalysis that reveals hematuria. Ultrasound examination of the urinary system is needed to rule out the presence of stones.3. If a patient is of advanced age and has a tumor of the urinary system, the symptoms of bleeding on urinalysis can also occur. It is also accompanied by back pain and lumbar trapped in the area where the tumor is located, so CT examination of the urinary system is needed to confirm the diagnosis.