The harm of polycystic ovary syndrome is mainly that it can cause patients to develop menstrual disorders, infertility, obesity, acanthosis nigricans and hairy, acne and so on. 1. Menstrual disorders and infertility: Polycystic ovary syndrome is often associated with ovulation disorders, and the lack of ovulation can lead to infertility. At the same time, ovulation disorder can cause menstrual disorders, manifested as scanty menstruation or amenorrhea. 2. Obesity: patients with polycystic ovary syndrome may have insulin resistance and hyperandrogenism, which may cause obesity. 3. acanthosis nigricans: related to the abnormal function of adrenal endocrine, mainly manifested as thickening of skin and pigmentation in labia and axilla. 4. Hairiness and acne: mainly related to hyperandrogenemia in patients with polycystic ovary syndrome. If there is any discomfort, it is recommended to consult a doctor in time for diagnosis and treatment.