In patients with urethritis who have blood in the urine, bleeding is considered to occur due to inflammation causing a break in the mucosal area of the urethra. If there is a small amount of bleeding, there may usually be a light red urine, or even an increase in abnormal red blood cells only found in a routine urine test. However, if the broken area injures small blood vessels, or if the urethritis is episodic causing an upper urinary tract infection such as cystitis, it may lead to the appearance of hematuria in the naked eye, or even a blood clot in the urine. Patients with UTI who have blood in the urine should be given sensitive anti-infective treatment promptly, while drinking more water and urinating more often. Usually 1-2 days after giving sensitive anti-infection treatment, the condition of blood in urine, as well as the urinary tract irritation signs of frequent, urgent and painful urination can be significantly relieved.