If women often urinate frequently at night, the possible causes are as follows: 1. overactive bladder syndrome, the cause is unknown, mainly with excessive and frequent contraction of the bladder forced urinary muscle, resulting in patients with frequent urination as the main symptom, and only manifested as frequent urination, not accompanied by painful urination, back pain or fever and other symptoms, urine routine, urine culture test does not exist bacterial infection. 2. urinary tract infection, urinary tract infection occurs Afterwards, the sensitivity of the bladder mucosa increases, and the storage of a small amount of urine can produce the phenomenon of frequent urination. This situation is usually accompanied by painful urination or a sense of incomplete urination, and after anti-infection treatment, the phenomenon of frequent urination at night can be improved. 3, bladder prolapse, mainly seen in women after multiple childbirth or postmenopausal women, there is often a relaxation of the pelvic floor muscle, which can lead to bladder prolapse, resulting in increased residual urine in the bladder, the patient will have the phenomenon of frequent urination at night, and at the same time can be accompanied by each time This can lead to increased residual urine in the bladder and frequent urination at night, which can be accompanied by low urine output or weakness in urination.