Doctors don't know why endometrial tissue grows outside of the uterus, causing the painful condition known as endometriosis, but they have several theories.
Doctors don't know why endometrial tissue grows outside of the uterus, but they have several theories. Heredity plays a role, and some endometrial cells may be present from birth.
Another theory suggests that menstrual blood containing endometrial cells flows back through the fallopian tubes and into the pelvic cavity instead of out of the body. These cells are thought to stick to organs and keep growing and bleeding over time. Cells could also move to the pelvic cavity other ways, such as during a C-section delivery. A faulty immune system may fail to get rid of the misplaced cells.
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