Urinary tract infection can cause bleeding from the mucous membrane of the urinary tract, which can be manifested as red urine. Generally, if 1ml of blood is mixed in 1000ml of urine, it can be manifested as light red urine, and it is called carnal hematuria. Mucosal erosion and congestion caused by urinary tract infections, the amount of bleeding is often greater than 1ml, so it will show the symptoms of bleeding and flesh-eye hematuria. Sometimes acute mucosal inflammation manifests itself as widespread oozing and bleeding, and it can also manifest itself as red urine or blood clots, which are a manifestation of urinary tract infection. When there is bleeding bacteria are more likely to multiply, so the symptoms of urinary tract infection tend to worsen, with intense urinary frequency, urinary urgency, painful urination, and even with elevated body temperature and other manifestations. It is recommended to go to the hospital immediately when there is bleeding in the urinary tract infection, and after giving urine culture to clarify the infecting bacteria, use antimicrobials to control the infection as soon as possible to avoid prolonged symptoms or serious bleeding.