Diagnostic and Prognostic Markers of Endometriosis in Menstrual Blood

Inclusion Criteria: For all participants: Women 18-45 of age who * Have their period * Have given their written consent * Have already used a menstrual cup as a method of hygienic protection * Residing or working in Ile de France (Paris Metropolitan area, France) For participants with endometriosis: * diagnosis of endometriosis established by surgery or imaging (ultrasound and/or MRI) * presence of one or more painful symptoms \> 3 on a visual scale (dysmenorrhea and/or dyspareunia and/or chronic pelvic pain) and/or infertility * for the surgery subgroup: planned surgery in the next 3 months For participants without endometriosis: * painful symptoms \< or equal to 3 on a visual scale (for dysmenorrhea and dyspareunia and chronic pelvic pain), * absence of intense period pain in adolescence (leading to taking pills to control this pain and/or peri-menstrual school absenteeism) Exclusion Criteria: For all participants: * Autoimmune diseases * Chronic diseases other than endometriosis (diabetes, hypertension) * A person who is the subject of a judicial safeguard measure (by declaration) * Infectious diseases (HIV, HBV, if known) * History of menstrual toxic shock syndrome For patients with endometriosis: * endometriosis surgery within the last 3 months.