Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Cystocele ?
    ### Response:
    A cystocele occurs when the muscles and supportive tissues between a womans bladder and vagina weaken and stretch, letting the bladder sag from its normal position and bulge into the vagina or through the vaginal opening. In a cystocele, the bladder tissue remains covered by the vaginal skin.
    