Heavy bleeding can sometimes be a symptom of endometriosis, but often it’s a symptom of another condition called ‘adenomyosis’. Adenomyosis is often seen alongside endometriosis. It’s a very similar disease but instead of the spots or lesions being outside the uterus, as is the case with endometriosis, they’re embedded in its muscular walls, making the uterus larger and more ‘bulky’. The increase in size means that there is more womb-lining to be shed during a period, making bleeding heavier. Read more about adenomyosis here.