High erythrocytes more than 400, usually refers to more than 400 erythrocytes per microliter in the urine sediment, the cause of which may be urinary tract infection, urinary stones, urinary tract tuberculosis and so on. 1. Urinary tract infections: such as urethritis, cystitis, nephritis, etc. can appear in the urine sediment red blood cells, urethritis, cystitis at the same time can be accompanied by frequent urination, urinary urgency, urinary pain and other symptoms, nephritis, in addition to red blood cells can be seen in the urine can also be seen proteinuria. 2. urinary stones: such as urethral stones, bladder stones, ureteral stones, kidney stones, etc. Red blood cells can be seen in the urine, ureteral stones, kidney stones are also manifested as renal colic, bladder stones are mainly manifested as urinary interruption and urinary pain. 3. Urinary tuberculosis: such as renal tuberculosis, red blood cells can appear in the urine, hematuria visible to the naked eye, clinical also manifested as urinary frequency, urinary urgency, urinary pain, urinary incontinence, lumbar discomfort, and low-grade fever, night sweats (abnormal sweating after going to sleep, waking up sweating stops) and other symptoms. Urine erythrocyte increase may also have other causes, such as urological tumors, etc. It is recommended to go to the hospital in a timely manner, identify the cause of the disease under the guidance of physicians to receive targeted treatment.