What causes red blood cell elevation in urine?

The human body shows a lot of factors that increase red blood cells in urine. For example, after recent fatigue, staying up late, and strenuous exercise, it can show physiological increase in red blood cells. After a certain amount of rest and conditioning, it can return to normal. If there is urinary system infection, it will also cause increase in red blood cells in urine, but at the same time it will be accompanied by increase in white blood cells. After anti-inflammatory symptomatic treatment, it has an effect. There are also urinary system abnormalities, such as left renal vein syndrome, also known as nutcracker syndrome, there will also be elevated red blood cells in the urine, accompanied by elevated protein in the urine, color Doppler blood vessel examination of the kidney can find specific lesions, requiring surgery. There are urinary stones or tumors, but also show elevated red blood cells in urine, systematic examination can find the primary disease causing red blood cells in urine, if found specific diseases, should be treated in time.