Oligomenorrhea & Amenorrhea

Pregnancy
Menopause or perimenopause
Polycystic ovary syndrome
Hypothalamic amenorrhea, eg, stress, weight change, exercise
Hyperprolactinemia
Hypothyroidism or hyperthyroidism
Diabetes mellitus
Premature ovarian failure
Other endocrine causes: Cushing’s syndrome, Addison’s disease, hypopituitarism (pituitary tumor), androgen-secreting tumor (adrenal, ovarian), congenital adrenal hyperplasia, acromegaly, Turner syndrome
Anorexia nervosa
Endometrial scarring (Asherman’s syndrome)
Anabolic steroids