A member asked:

What may be the cause of long menstruation period, that usually last for 18 days?

A doctor has provided 1 answer

Low progesterone : Menstruation is sloughing of endothelial lining. This requires drop in estrogen levels and surge in Progesterone levels. When the Progesterone surge is inadequate, the lining does not slough off quickly completely-it drags out. See your doctor for further evaluation.

Answered 1/9/2015

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