A red blood cell microscopy of 7 to 9 usually suggests microscopic hematuria. Microscopic hematuria means that blood cannot be seen in the urine on visual observation, and red blood cells are seen under the microscope after the urine is centrifuged. The most common causes of microscopic hematuria are urinary tract infections, stones, tumors and other related diseases. 1. Urinary tract infection: refers to pathogen infection in the urinary system, the main symptoms are painful urination, frequent urination, urinary urgency, treatment can be given to anti-infection (amoxicillin), regular testing of routine urinalysis. 2. Urinary stones: refers to the stones occurring in the urinary system, the main symptom is pain (waist or abdomen), the general treatment is to take out the stones, can be extracorporeal lithotripsy or surgical removal of stones. 3. Urological tumor: the main symptom of urinary tumor is painless and intermittent hematuria, which needs to improve the examination of the urinary system and make a clear diagnosis. Patients with microscopic hematuria may also be other reasons, it is recommended to go to the hospital in time to identify the cause of the disease and timely treatment.