If there is hematuria recognizable to the naked eye, or microscopic hematuria found on physical examination, does it mean that you have glomerulonephritis? Actually, it is not. There are many possible reasons for the appearance of hematuria. First, it may be due to contamination, like hemorrhoids, bleeding from menstruation or uterine or vaginal causes that contaminate the urine, and you can have blood-colored urine, but this is not true hematuria; second, it may also be due to red urine caused by taking certain drugs, vegetables, pigments, dyes, reagents, and other pigment-containing substances, such as tuberculosis patients who use rifampin after Red-orange urine. Red urine may occur after consuming red dragon fruit. Again, diseases other than kidney disease, such as urinary tract bacterial infections, kidney tuberculosis, kidney stones, bladder stones, bladder tumors, or urinary system abnormalities, may also form hematuria.