Who gets endometriosis?

Endometriosis can happen in any girl or woman who has menstrual periods, but it is more common in women in their 30s and 40s.

You might be more likely to get endometriosis if you have:
Never had children
Menstrual periods that last more than seven days
Short menstrual cycles (27 days or fewer)
A family member (mother, aunt, sister) with endometriosis
A health problem that blocks the normal flow of menstrual blood from your body during your period