There are many possible causes of occult blood in routine urine tests, and further examination is needed to clarify. 1. Nephrogenic hematuria, such as glomerulonephritis or occult glomerulonephritis, can manifest as simple positive urine occult blood, without any conscious symptoms, and without abnormal urine volume or pain, which is often difficult to diagnose, and a kidney puncture biopsy is necessary to reach a final diagnosis. 2. The most important thing is to have a good understanding of the patient’s condition and to make sure that the patient has a good understanding of the condition. The tumor can be accompanied by occult blood and discomfort such as pain in the lower back and abdomen, which requires further CT examination of the urinary tract to rule out.