Our expert says:
There is certainly a growing body of evidence to suggest that tampon use may in fact be associated with retrograde menstruation and hence endometriosis. However, the exact mechanism remains to be explored and is in my opinion not simply an obstructive process i.e. blocking the outflow of blood, but may also be due to a slight change or shift in the angle of the cervix, which may alter the position of the canal and thereby increase outflow pressure.
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