A member asked:

What are the causes of irregular periods in nulligravid woman?

A doctor has provided 1 answer
Dr. Gerard Honore answered

Specializes in Fertility Medicine

Ovulation: Ovulation is necessary to have normal spontaneous menstrual periods. After ovulation the hormone Progesterone rises; if no pregnancy occurs, Progesterone falls and a period begins. In anovulation there is no Progesterone rise: menstruation cannot occur, so periods are irregular or absent altogether.

Answered 7/1/2016

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