Risk factors

Several factors place you at greater risk of developing endometriosis, such as:

• Never giving birth
• Starting your period at an early age
• Going through menopause at an older age
• Short menstrual cycles — for instance, less than 27 days
• Heavy menstrual periods that last longer than seven days
• Having higher levels of estrogen in your body or a greater lifetime exposure to estrogen your body produces
• Low body mass index
• One or more relatives (mother, aunt or sister) with endometriosis
• Any medical condition that prevents the passage of blood from the body during menstrual periods
• Disorders of the reproductive tract

Endometriosis usually develops several years after the onset of menstruation (menarche). Signs and symptoms of endometriosis may temporarily improve with pregnancy and may go away completely with menopause, unless you're taking estrogen.