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Anovulation



Anovulation
Classification & external resources
ICD-10 N97.0
ICD-9 628.0
eMedicine med/146 
MeSH D000858

In medicine, anovulation is absence of ovulation when it would be normally expected (in a post-menarchal, premenopausal woman).

Additional recommended knowledge

Causes

Anovulation can result from a variety of factors:

Some anovulatory women may have two or more contributing conditions.

Treatment

Anovulation can generally be reversed by ameliorating the causal factors (except in cases of permanent pituitary or ovarian failure).

Associated conditions

For most women, alteration of menstrual periods is the principal indication of chronic anovulation. Ovulatory menstrual periods tend to be regular and predictable in terms of cycle length, duration and heaviness of bleeding, and other symptoms. Ovulatory periods are often accompanied by midcycle symptoms such as mittelschmerz or premenstrual symptoms. In contrast, 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). Mittelschmerz and premenstrual symptoms tend to be absent or reduced when a woman is anovulatory.

Chronic anovulation is a common cause of infertility.

In addition to the alteration of menstrual periods and infertility, chronic anovulation can cause or exacerbate other long term problems, such as hyperandrogenism or osteopenia. It plays a central role in the multiple imbalances and dysfunctions of polycystic ovary syndrome.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Anovulation". A list of authors is available in Wikipedia.
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