title: Adolescent menstrual irregularity.
abstract: Amenorrhea and oligomenorrhea in the adolescent female are often the result of anovulation due to an immature hypothalamic-pituitary-ovarian axis. A careful history, physical examination and selected laboratory tests can help to differentiate this type of transient menstrual irregularity from the large number of endocrine and anatomic abnormalities that also present in this age group.
mesh_terms: D000293:Adolescent; D000310:Adrenal Gland Neoplasms / Q000150:complications; D000312:Adrenal Hyperplasia, Congenital / Q000150:complications; D000728:Androgens / Q000378:metabolism; D000856:Anorexia Nervosa / Q000150:complications; D000858:Anovulation / Q000150:complications; D003276:Contraceptives, Oral / Q000009:adverse effects; D005260:Female; D006059:Gonadal Dysgenesis / Q000150:complications; D006628:Hirsutism / Q000150:complications; D006801:Humans; D007006:Hypogonadism / Q000150:complications; D007030:Hypothalamo-Hypophyseal System / Q000503:physiopathology; D008572:Menarche; D008599:Menstruation Disturbances / Q000209:etiology*; D010049:Ovarian Diseases / Q000150:complications; D010053:Ovary / Q000503:physiopathology; D005082:Physical Exertion; D010906:Pituitary Hormone-Releasing Hormones / Q000172:deficiency; D010911:Pituitary Neoplasms / Q000378:metabolism; D011085:Polycystic Ovary Syndrome / Q000150:complications; D011388:Prolactin / Q000378:metabolism; D013315:Stress, Psychological / Q000150:complications; D014599:Uterus / Q000002:abnormalities; D014621:Vagina / Q000002:abnormalities
chemical_list: D000728:Androgens; D003276:Contraceptives, Oral; D010906:Pituitary Hormone-Releasing Hormones; D011388:Prolactin