What Causes Endometriosis?
The exact cause of endometriosis remains unknown, though several different theories have been put forward.

One popular theory is that endometrial tissue has the ability in some cases to replace other types of tissues outside the uterus, a process called metaplasia.

Another theory, retrograde menstruation, suggests that menstrual tissue flows backwards through the fallopian tubes where it implants and grows.

Most researchers, however, agree that endometriosis is exacerbated by oestrogen.

Studies have shown that first-degree relatives of women with this disease are more likely to develop endometriosis themselves. And when there is a hereditary link, the severity of endometriosis tends to be worse in the next generation.