Urine red blood cells 20,000 / ul is considered to have hematuria, is generally more serious, but whether it is serious mainly depends on the cause of red blood cells in the urine. If it is physiological causes such as hematuria caused by strenuous exercise, it is usually not serious; if it is pathological causes such as glomerulonephritis, urinary stones, urinary tumors, etc., if the condition is mild and the treatment effect is good, it is not serious at this time, and if the condition is severe and the treatment effect is not good, it will be more serious. 1. Physiological reasons: if normal people who usually exercise less, exercise hematuria may occur after suddenly increasing the amount of exercise, but this is only transient, does not need special treatment, usually not serious. 2. Pathologic causes: (1) Glomerulonephritis: manifested by hematuria, proteinuria, hypertension and edema. If the pathological type is light, the treatment effect is good and the condition is relieved, hematuria is not serious at this time; if the pathological type is heavy and the treatment effect is poor, it is more serious at this time. (2) Urinary stones: When kidney stones or ureteral stones are present, the stones rub against the mucous membrane causing bleeding of the mucous membrane and hematuria. It can be treated by means of lithotripsy drugs or surgery. If the treatment effect is good, it is not serious at this time; if the treatment effect is poor and continues to damage the kidney, it is more serious at this time. (3) Urological tumors: renal tumors can also cause painless hematuria when invading renal calyx and renal pelvis. It is more serious at this time. There may be other reasons for red blood cells in urine, so it is recommended that patients go to regular hospitals in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.