Luteal Phase Deficiency (LPD) is also called Luteal Phase Defect, but I don't particularly like to think of the human body as "defective" so I prefer deficiency.  LPD is a hormonal condition that involves deficiency of progesterone, which makes the luteal phase (the portion of the cycle after ovulation and before menstruation) a bit too short. This may contribute to low basal body temperatures during this phase, which can make implantation and pregnancy difficult. In fact, infertility and miscarriage are common symptoms of LPD and progesterone deficiency.

If this is the first time you're hearing about LPD, then you probably have a lot of questions. What causes it? How can you tell if you have it? And what can you do to treat it? Not to worry, I'm going to break it all down for you right now.

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