High erythrocytes in urine microscopy indicates that hematuria may exist. There are many reasons for high erythrocytes in urine microscopy, including physiological and pathological reasons. Physiological causes can be seen after excessive exercise, while pathological hematuria is commonly found in urinary tract infections, tumors of the urinary system, and renal diseases. 1. Urinary tract infection: acute cystitis, acute pyelonephritis and other diseases can cause hematuria. 2. Urological tumors: Urological tumors can easily occur in any part of the urinary system, which may also lead to high erythrocytes in urography, and the manifestation of which is characterized by painless hematuria of the naked eye. 3. Renal diseases: such as glomerulonephritis, acute nephritis patients may have symptoms of hematuria. Urine microscopy red blood cell elevation of the etiology is very complex, need to be combined with the patient’s accompanying symptoms to improve the relevant examination, a clear diagnosis and systematic treatment. It is recommended that patients with hematuria consult a doctor in time and follow the doctor’s instructions for treatment.