Blood urine still appears after treatment of urinary tract infection may be caused by incomplete treatment of urethritis, recurrence of cystitis and nephritis. 1. Urethritis: Urethritis is caused by gonococcus and non-gonococcus and other pathogens infection, the patient’s main symptoms are hematuria, frequent urination, urinary urgency and so on. If the patient is not cured when treated, it will lead to hematuria symptoms still exist, so the patient’s urinary tract infection is still hematuria after treatment. 2. Cystitis: Cystitis is caused by a variety of factors such as bacterial infection, and patients will experience symptoms such as urinary urgency, painful urination, hematuria, and lower abdominal pain. Cystitis is easy to recur, patients may have recurrence after treatment, so patients still have hematuria after treatment of urinary tract infection. 3. Nephritis: the cause of nephritis is not clear, it is considered to be caused by viral, bacterial and other pathogens infection, patients will have symptoms such as hematuria, proteinuria, edema and so on. Since nephritis is not a disease of urinary tract infection, patients still have hematuria after treatment of urinary tract infection. There may be other reasons why patients still have hematuria after treatment of urinary tract infection, and they should go to the hospital in time for examination and treatment as prescribed by the doctor.