Determining the effectiveness of cognitive behavioural therapy in improving quality of life in patients undergoing endometriosis surgery: a study protocol for a randomised controlled trial.

Introduction: Endometriosis can cause chronic pain and subfertility thereby negatively affecting quality of life (QoL). Surgical removal of endometriosis lesions leads to improved health-related QoL, although not to the level of QoL of healthy controls. Pain intensity and cognitions regarding pain can play a crucial role in this health-related QoL following surgical treatment.