High erythrocytes in urine sediment may be caused by nephritis, urinary stones, urinary tumors and other pathological factors, or physiological factors such as strenuous exercise. 1. Nephritis: glomerulonephritis, interstitial nephritis and other diseases may appear hematuria, positive urinary occult blood, urine sediment microscopy shows high erythrocytes, but also can be accompanied by edema, hypertension and other clinical manifestations, renal puncture biopsy and other tests can assist in the definitive diagnosis. 2. urinary stones: bladder stones, ureteral stones and other diseases may appear hematuria, positive urinary occult blood, urine sediment microscopy shows high erythrocytes, may also be accompanied by abdominal pain, nausea, dysuria and other symptoms, urinary ultrasound / CT and other tests can be used to assist in the definitive diagnosis. 3. Urological tumor: Kidney cancer, bladder cancer and other diseases may also have hematuria, positive urinary occult blood, high red blood cells in urine sediment microscopy, accompanied by symptoms such as fatigue, emaciation, waist pain, etc. Abdominal CT and other examinations can assist in definite diagnosis. Physiological factors such as strenuous exercise, usually eliminate the triggers, after appropriate rest can return to normal. There are many causes of high urinary sediment erythrocytes, it is recommended to consult a doctor in a timely manner to clarify the diagnosis, to avoid delaying the condition.