Validation Study for Endometriosis PRO

Inclusion Criteria: * Women with endometriosis confirmed by laparoscopy or laparotomy within five years before the baseline visit * Good general health (except for findings related to endometriosis) as proven by medical history * Patient has experienced endometriosis symptoms (i.e. pain) in the past 4 weeks, as assessed by a numerical rating scale (NRS) Exclusion Criteria: * Any diseases or conditions that might interfere with the conduct of the study or the interpretation of the results * Undiagnosed abnormal genital bleeding * Abuse of alcohol, drugs, or medicine (e.g., laxatives) * Simultaneous participation in another clinical trial. Participation in another clinical trial prior to study entry that might have an impact on the study objectives, at the discretion of the investigator. * Major surgery scheduled for the study period, except therapeutic surgical procedure for endometriosis * Close affiliation with the study site; e.g. a close relative of the investigator, dependent person (e.g. employee or student of study site) * Inability to cooperate with the study procedures for any reason, including the following examples: language comprehension, psychiatric illness, inability to get to the study site * Previous enrollment to this study * Regular use of pain medication due to other underlying diseases * Known pregnancy