Endometriosis is a chronic benign gynecological condition affecting 5 to 10% of women of reproductive age, often responsible for pelvic pain, digestive symptoms, and infertility, leading to a significant reduction in quality of life. Despite its high prevalence, the long-term outcomes of different medical and surgical treatments remain poorly documented. The IFEMENDO study is a prospective, observational, single-center, non-interventional cohort conducted at the Endometriosis Center of Clinique Tivoli-Ducos in Bordeaux, France. The objective is to evaluate the long-term efficacy of various therapeutic strategies-both medical and surgical-in terms of symptom improvement, quality of life, recurrence, and fertility outcomes. Women with histologically or radiologically confirmed pelvic endometriosis are invited to participate. Data are collected through standardized questionnaires at baseline and at 1, 3, 5, 7, and 10 years after inclusion, either via the secure NO ENDO online platform or in paper form. The study will contribute to a better understanding of the natural history of endometriosis and the long-term effectiveness of different treatment approaches, ultimately supporting improvements in clinical management and patient care.