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A menstrual disorder is an irregular condition in a woman's menstrual cycle.

Disorders of ovulation

Menstrual disorder
Specialty	Obstetrics and gynaecology

Infrequent or irregular ovulation (usually defined as cycles of >/=36 days or <8 cycles a year) is called oligoovulation.

Anovulation is absence of ovulation when it would be normally expected (in a post-menarchal, premenopausal woman). Anovulation usually manifests itself as irregularity of menstrual periods, that is, unpredictable variability of intervals, duration, or bleeding. Anovulation can also cause cessation of periods (secondary amenorrhea) or excessive bleeding (dysfunctional uterine bleeding).

Disorders of cycle length

Menstrual disorder
Specialty	Obstetrics and gynaecology

Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer.

Metrorrhagia refers to frequent, but irregular, menstruation. If the bleeding is also heavy, it may be called menometrorrhagia.

Oligomenorrhea is the medical term for infrequent, often light menstrual periods (intervals exceeding 35 days).

Menstrual disorder
Specialty	Obstetrics and gynaecology

Amenorrhea is the absence of a menstrual period in a woman of reproductive age. Physiologic states of amenorrhoea are seen during pregnancy and lactation (breastfeeding). Outside of the reproductive years there is absence of menses during childhood and after menopause.

Disorders of flow

Hypomenorrhea is abnormally light menstrual periods.

Menorrhagia is an abnormally heavy and prolonged menstrual period. If these heavy periods occur at short intervals, menometrorrhagia may be diagnosed. Causes may be due to abnormal blood clotting, disruption of normal hormonal regulation of periods or disorders of the endometrial lining of the uterus. Depending upon the cause, it may be associated with abnormally painful periods (dysmenorrhoea).

Dysmenorrhea

Menstrual disorder
Specialty	Obstetrics and gynaecology

Dysmenorrhea (or dysmenorrhoea), cramps or painful menstruation, involves menstrual periods that are accompanied by either sharp, intermittent pain or dull, aching pain, usually in the pelvis or lower abdomen.

See also

• Premenstrual syndrome (PMS)
• Pelvic inflammatory disease
• Adenomyosis
• History of sexual or physical abuse
• Fibroids
• Ovarian cysts
• Endometriosis

External links

• Oligomenorrhea at Penn State
• NIH

• Gynecology
• Menstruation