More than five million women in the United States have endometriosis. It is one of the most common health problems for women. It can occur in any teen or woman who has menstrual periods, but it is most common in women in their 30s and 40s.
The symptoms of endometriosis stop for a time during pregnancy. Symptoms also tend to decrease with menopause, when menstrual periods end for good. In some cases, women who take menopausal hormone therapy may still have symptoms of endometriosis.
This answer is based on source information from The National Women's Health Information Center.