* The reason of retrograde menstruation is also unknown.* It should be clear that having retrograde menstruation can not be the only reason behind endometriosis because there are many women who have this kind of menstruation but not all of them have endometriosis.
* There is another possibility that the lining the inside of the organs in the pelvis has primitive cells that can transform into a different kind of cells including endometrial cells and this is called coelomic metaplasia.
* It is so probable that the transmission of endometrial cells during certain surgeries like caesarian deliveries can be causing endometriosis (it becomes evident in cases where endometriosis is found in surgical operations scars).
* The theory of how endometriosis is found in rare places outside the pelvis such as the brain or lungs is that cells might have been carried with the lymph liquid.
.jpg)
