Girls who urinate red may have hematuria appeared, and related to cystitis, stone disease, urinary tract tumors such as bladder cancer and other diseases. 1. The causative agent of cystitis is mostly Escherichia coli. The main manifestations include frequent urination, urinary urgency, painful urination, and a feeling of incomplete urination even after emptying. At the same time, there will be terminal hematuria, and sometimes hematuria throughout. 2. Stone disease is generally related to the body’s metabolic abnormalities, age, gender, dietary habits and so on. The main manifestations include pain in the kidney area, hematuria, nausea, vomiting and bladder irritation. 3. Bladder tumor may be related to smoking, long-term exposure to industrial chemicals and other triggers. Its main manifestations include urinary frequency, urgency, urinary pain and intermittent painless hematuria. Hematuria is the most common manifestation. The specific cause of the disease, but also need to go to the regular hospital to consult the doctor to determine.