Editing Anovulation (section)

=== Primary ovarian insufficiency ===
POI was previously referred to as premature ovarian failure (POF) and diagnosed when menopause occurred before age 40 but occurs in only 1 percent of all women.<ref name="ChavarroRich-Edwards2007">{{cite journal|last1=Chavarro|first1=Jorge E.|last2=Rich-Edwards|first2=Janet W.|last3=Rosner|first3=Bernard A.|last4=Willett|first4=Walter C.|year=2007|title=Diet and Lifestyle in the Prevention of Ovulatory Disorder Infertility|journal=Obstetrics & Gynecology|volume=110|issue=5|pages=1050–1058|doi=10.1097/01.AOG.0000287293.25465.e1|issn=0029-7844|pmid=17978119|s2cid=6719868}}</ref> The [[ovaries]] can stop working in about 5% of cases. This may be because the ovaries do not contain eggs. However, a complete blockage of the ovaries is rarely a cause of [[infertility]]. Blocked ovaries can start functioning again without a clear medical explanation. In some cases, the egg may have matured properly, but the [[Ovarian follicle|follicle]] may have failed to burst (or the follicle may have burst without releasing the egg). This is called [[Luteinised unruptured follicle syndrome|luteinized unruptured follicle syndrome]] (LUFS). Physical damage to the ovaries, or ovaries with multiple cysts, may affect their ability to function. This is called ovarian dystrophy.