A cystocele or bladder prolapse occurs when the tissues and muscles that hold the bladder in place are stretched or weakened. This causes the bladder to move from its natural position and press against the front wall of the vagina, forming a bulge. A cystocele often occurs together with a prolapse of the urethra (urethocele). Both conditions can result in Stress Incontinence. In advanced cases, prolapse may cause blockage of urine.