The possible causes of sudden urinary frequency and bleeding in women are: first, acute cystitis or urethritis. This can appear suddenly frequent urination, blood in the urine with painful urination and other symptoms, the patient feels incomplete urination repeatedly need to urinate, and the pain can be progressively aggravated or accompanied by fever, chills and other symptoms. It is recommended to go to the hospital for routine urine tests and urine culture tests to clarify the presence of infection. Second, urinary tract stones. Such as kidney stones, bladder stones, etc. may cause sudden bleeding, accompanied by strong urinary tract irritation, frequent and urgent urination, and pain in the area where the stones are located, such as lumbago, abdominal pain or small abdominal pain, etc. It is necessary to go to the hospital for ultrasound examination of the urinary system to rule out the presence of urinary tract stones. Third, urinary tract tumor. This is when the tumor growth center necrosis occurring rupture can suddenly manifest as hematuria, because of more bleeding can be related to certain stimulation can be accompanied by frequent urination, but generally not accompanied by any pain, it is recommended to go to the hospital for urological CT examination to exclude the presence of tumor.