Endometriosis manifests itself in a variety of ways and shares symptoms with other conditions. As a consequence, diagnosis can be difficult and is sometimes delayed. Information on endometriosis is available at the following webpages: NHS.UK: https://www.nhs.uk/conditions/endometriosis/ The Royal College of Obstetricians and Gynaecologists: https://www.rcog.org.uk/en/patients/patient-leaflets/endometriosis/ The National Institute for Health and Care Excellence: https://www.nice.org.uk/guidance/conditions-and-diseases/gynaecological-conditions/endometriosis-and-fibroids Endometriosis UK: https://www.endometriosis-uk.org/