An investigation by the ABC's Four Corners program has unveiled serious allegations against a renowned Melbourne gynaecologist.

Former patients of Dr Simon Gordon have shared their stories of going through multiple surgeries for "severe" endometriosis, only to later discover that their pathology results showed little or no evidence of disease.

Endometriosis affects around one in seven girls and women in Australia, and getting a diagnosis can take, on average, six to eight years. For many, it's already been a long battle just to have their pain believed.

Now, these allegations against a prominent specialist have left some patients questioning the system they turned to for help.