Risk Factors for Non-response to Hormonal Medical Therapy in Patients With Endometriosis

Inclusion Criteria: * age between 18 and 50 years; * patients with endometriosis-related pain symptoms (dyspareunia, dyschezia, dysmenorrhea, chronic pelvic pain, dysuria, periovulatory pain, with at least one of these symptoms presenting Numerical Pain Rating Scale intensity \> 5); * indication for administration of oral hormonal medical treatment for endometriosis; * acquisition of informed consent. Exclusion Criteria: * patients with contraindications to oral hormone treatment * current or previous pelvic infections * history of malignancy or current suspicion of gynecologic malignant lesions * previous pelvic surgery (hysterectomy, salpingectomy, ovarian cyst removal, myomectomy, surgery for endometriosis, bowel resections) * positive history of other causes of chronic pelvic pain * post-menopausal status