The signs and symptoms of<unk>  can be seen as part of a continuum of changes leading to menopause.<unk>  contrasts with age-appropriate menopause in the age of onset, degree of symptoms and sporadic return to normal<unk>  function. As some women retain partial<unk>  function, symptoms may not be as severe as regular menopause. In others, particularly with coexistent depression, symptoms such as decreased quality of life can be severe. Hormonally,<unk>  is defined by abnormally low levels of estrogen and high levels of FSH, which demonstrate that the ovaries are no longer responding to circulating FSH by producing estrogen and developing fertile eggs. The ovaries will likely appear smaller than normal. The age of onset can be as early as 11 years.<unk>  can be seen as part of a continuum of changes leading to menopause that differ from age-appropriate menopause in the age of onset, degree of symptoms, and sporadic return to normal<unk>  function. A contrasting problem can be when a girl never begins menstruation due to a genetic condition causing<unk>  amenorrhea.
Primary ovarian insufficiency
Functional hypothalamic amenorrhea
Gonadotropin-resistant ovary syndrome
Androgen insufficiency syndrome
Hypergonadotropic hypergonadism
Polycystic ovary syndrome
Anovulation
Lactational amenorrhea