Endometriosis growths are benign (not cancerous). But they can still cause problems.
Endometriosis happens when tissue similar to the lining on the inside of your uterus or womb grows outside of your uterus or womb where it doesn't belong. Endometriosis growths may swell and bleed in the same way the lining inside of your uterus does every month — during your menstrual period. This can cause swelling and pain because the tissue grows and bleeds in an area where it cannot easily get out of your body.
The growths may also continue to expand and cause problems, such as:
- Blocking your fallopian tubes when growths cover or grow into your ovaries. Trapped blood in the ovaries can form cysts.
- Inflammation (swelling)
- Forming scar tissue and adhesions (a type of tissue that can bind your organs together). This scar tissue may cause pelvic pain and make it hard for you to get pregnant.
- Problems in your intestines and bladder