Premature ovarian failure (POF), also known as premature ovarian insufficiency, primary ovarian insufficiency (this is the most accurate term as some women may still conceive), premature menopause, hypergonadotropic hypogonadism is defined as failure of the ovary to function adequately in a woman younger than 40 years, in its role either as an endocrine organ or as a reproductive organ, a condition characterized by amenorrhea, hypoestrogenism, and elevated serum gonadotropin levels (which demonstrate that the ovaries are no longer responding to circulating FSH by producing estrogen and developing fertile eggs) in women younger than 40 years. This condition occurs in approximately 1% of women and it has important physical and psychological consequences/impact in those patients.