Menstrual disorders in adolescence: pathophysiology and treatment.

Menstrual problems including amenorrhea, oligomenorrhea, irregular cycles, abnormal uterine bleeding or dysmenorrhea represent 50% of adolescents' gynecologic complaints. Irregular and anovulatory cycles are common during the first postmenarcheal years and may reflect a normal transient step of ovarian hyperandrogenism, but they may also result from hormonal abnormalities affecting the adrenals, the ovaries or the pituitary. Amenorrhea may be a sign of late puberty or of a problem affecting the hypothalamus, the pituitary or the ovaries. Evaluation includes a complete physical examination, basal hormonal determinations of the hypothalamic-pituitary-ovarian function, of the thyroid, of the androgens and of the nutritional and growth parameters. This first evaluation must be completed by a karyotype analysis in case of primary amenorrhea or by the measurements of free testosterone, androstanediol glucuronide and testosterone glucuronide in case of hirsutism, and may be followed by X-rays, echography or dynamic tests depending on the first results. Therapy will always be directed towards the etiology of the disease. Abnormal uterine bleeding is generally the result of anovulatory cycles and responds to hormonal therapy, but a systemic illness, a local pathology or a complicated pregnancy must always be excluded. In case of dysmenorrhea, endometriosis must be excluded. Simple dysmenorrhea is generally suppressed by antiprostaglandins.