The sudden appearance of symptoms of hematuria in women should be alert to the possibility of diseases such as urinary system infections, urinary system stones and urinary system tumors. 1. Inflammation of the urinary system: such as cystitis, urethritis and other diseases, may lead to the symptoms of blood in the urine. 2. Urinary stones: such as bladder stones, urethral stones, etc., in the process of urination, can damage the mucous membrane of the urinary system, triggering the symptoms of blood in urine. 3. Urinary system tumor: such as bladder cancer, kidney cancer and other diseases, can also trigger the symptoms of blood in urine. Besides, hematuria may also be related to external injury, coagulation dysfunction and other causes. It is suggested that patients should seek medical examination as soon as possible and carry out targeted treatment under the guidance of doctors.