Causes of Luteal Phase Defect The luteal phase is usually about 12 to14 days long. During this time, your ovaries produce a hormone called progesterone. This hormone tells the lining of the uterus, called the endometrium, to grow. If you become pregnant, the developing baby attaches to this thickened lining. If you do not become pregnant, the lining eventually sheds, and you have a period. A luteal phase defect can occur if:-- The lining of the uterus does not properly respond to the progesterone.-- Your ovaries do not release enough progesterone.
Luteal phase defect has been linked to many health conditions, including:ObesityThyroid disordersAnorexiaEndometriosisPolycystic ovarian syndromeExtreme amounts of exerciseHyperprolactinemia (excess of a hormone that's responsible for milk production in breasts)