Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Polycystic ovarian syndrome ?
    ### Response:
    Polycystic ovarian syndrome (PCOS) is a health problem that can affect a woman's menstrual cycle, ability to have children, hormones, heart, blood vessels, and appearance. Women with this condition typically have high levels of  hormones called androgens, missed or irregular periods, and many small cysts in their ovaries.
    