Polycystic ovary syndrome is characterized by the following features: 1) ultrasound examination reveals bilateral ovaries with more than 12 follicles in each ovary; 2) anovulation or sporadic ovulation; and 3) an increase in androgenic hormones. Polycystic ovary syndrome can be diagnosed if two of the above three conditions are met. However, patients with polycystic ovary syndrome have normal ovarian function and do not have abnormally high follicle stimulating hormone (FSTH), whereas premature ovarian failure is characterized by changes in menstruation, scanty menstruation, or decreased menstrual flow, as well as corresponding hot flashes and excessive sweating, insomnia and excessive sleepiness, and decreased libido, and other symptoms, and laboratory tests show abnormally high levels of follicle stimulating hormone. Follicle stimulating hormone is abnormally elevated, so the two are completely different things.