Endometriosis is a common gynecological disease and can cause pelvic pain and infertility; although the latest represent a small but significant percentage of up to 50% of the testing female infertility using laparoscopy. Its pathogenesis is poorly understood though several theories are now offered which attempt to explain its appearance, such as genetic factors that could make women susceptible to this entity. The mechanisms that explain the pathophysiology of infertility are tubal blockage, pelvic adhesions and ovarian endometriomas distort anatomic relationships and limit access and mobility of the fimbriae to the ovary. The most widely used method for diagnosis of endometriomas is ultrasound. This article presents a literature review on the pathophysiology, aetiology, clinical manifestations, diagnosis and treatment of endometriosis and endometriomas in the area of infertility.