A cystocele occurs when the bladder descends inferiorly towards the vagina and perineum. This happens when the wall between the bladder and the anterior vaginal fascia weakens. Depending on the degree of descent, prolapse can be graded as Grade I (level of vagina), Grade II (level of vaginal introitus), and Grade III (perineum through the vaginal opening). Some of the risk factors include pregnancy and childbirth, age, and repetitive straining.