Naked eye hematuria is a change in the color of urine, which can be washed meat, blood, soy sauce color, etc., and the number of red blood cells in the urine is related to the common causes of acute cystitis and acute glomerulonephritis in children; adults cause hematuria due to common iga-nephropathy, acute glomerulonephritis, renal stones, etc.; older people most commonly seen causes of oncological causes, need to go to nephrology department for a clear diagnosis, and symptomatic treatment. The most common causes in the elderly are tumors. There are also some rare causes, such as polycystic kidney rupture bleeding, hemophilia, abnormal blood clotting function, etc., which can lead to hematuria. Some special causes can also appear red urine, common after strenuous exercise, muscle pressure, high temperature work, cold, frostbite hematuria, is caused by rhabdomyolysis, urine routine will appear positive protein, occult blood, but negative microscopic examination of red blood cells, the main reason is that myoglobin caused by the red urine. The main reason is that myoglobin causes redness in the urine. After hematuria occurs, you can drink more water and urinate more often as the basis of treatment, and consult the hospital in a timely manner.