Oligomenorrhea Classification and external resources ICD-10 N91.5 ICD-9 626.1 DiseasesDB 14843
Oligomenorrhea (or oligomenorrhoea) is infrequent (or, in occasional usage, very light) menstruation. More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year. Also, menstrual periods should have been regularly established previously before the development of infrequent flow. The duration of such events may vary.
Oligomenorrhea can be a result of prolactinomas (adenomas of the anterior pituitary). It may also be caused by thyrotoxicosis, hormonal changes in perimenopause, Prader-Willi Syndrome, and Graves disease. "Endurance exercises such as running or swimming can affect the reproductive physiology of women athletes. Female runners, swimmers and ballet dancers menstruate infrequently in comparison to nonatheletic women of comparable age or not at all (amenorrhea). The degree of menstrual abnormality is directly proportional to the intensity of the exercise. For example, Malina et al., (1978) have shown menstrual irregularity is more common, and more severe among tennis players than among golfers" (modified by a student paper written by A. Lord) Breastfeeding has also been linked to irregularity of menstrual cycles due to hormones which delay ovulation.
Women with polycystic ovary syndrome (PCOS) are also likely to suffer from oligomenorrhea. PCOS is a condition in which the ovaries become filled with small cysts. Women with PCOS show menstrual irregularities that range from oligomenorrhea and amenorrhea on the one hand to very heavy, irregular periods on the other. The condition affects about 6% of premenopausal women and is related to excess androgen production.
Eating disorders can also result in oligomenorrhea. Although menstrual disorders are most strongly associated with Anorexia nervosa, Bulimia nervosa may also result in oligomenorrhea or amenorrhea. There is some controversy regarding the exact mechanism for the menstrual dysregulation, since amenorrhea may sometimes precede substantial weight loss in some anorexics; thus some researchers hypothesize that some as-yet unrecognized neuroendocrine phenomenon may be involved, and the menstrual irregularities may be related to the biological undergirding of the disorders, rather than a result of nutritional deficiencies.
- ^ a b c thefreedictionary.com > oligomenorrhea This dictionary, in turn, is citing: Gale Encyclopedia of Medicine. 2008
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- ^ Frisch RE, Gotz-Welbergen AV, McArthur JW et al. (1981). "Delayed menarche and amenorrhea of college athletes in relation to age of onset of training". JAMA 246 (14): 1559–1563. doi:10.1001/jama.246.14.1559. PMID 7277629.
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- ^ http://www.duofertility.com/en/my-fertility/medical-info/causes-of-infertility/female-infertility/ovulatory-dysfunction/egg-production/oligomenorrhea.
- ^ Malina RM, Spirduso WW, Tate C, Baylor AM (1978). "Age at menarche and selected menstrual characteristics in athletes at different competitive levels and in different sports". Med Sci Sports 10 (3): 218–22. PMID 723515.
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Female diseases of the pelvis and genitals (N70–N99, 614–629) InternalAdnexaEndometritis · Endometriosis · Endometrial polyp · Endometrial hyperplasia · Asherman's syndrome · Dysfunctional uterine bleedingmenstruation: flow (Amenorrhoea, Hypomenorrhea, Oligomenorrhea) · timing (Menorrhagia, Menometrorrhagia, Metrorrhagia) · pain (Dysmenorrhea, PMS)GeneralVaginitis (Bacterial vaginosis, Atrophic vaginitis, Candidal vulvovaginitis) · Leukorrhea/Vaginal discharge · Hematocolpos/HydrocolposSexual dysfunction (Dyspareunia, Hypoactive sexual desire disorder, Sexual arousal disorder, Vaginismus)Other/generalPelvic inflammatory disease · Pelvic congestion syndrome External Menstrual cycle Events and phases Life stages TrackingSignsSystems Suppression Disorders Related events In culture and religion
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