Endometriosis is a condition that affects women, usually during their reproductive years. In women with endometriosis, the tissue that lines the uterus starts to grow outside of the uterus. This can cause pain during their periods or during sex, and constant pain in the pelvis. Endometriosis can decrease a woman's quality of life and requires long-term treatment to control the symptoms.

For some women with endometriosis, symptoms can return after they stop treatment. Or, they may not be able to tolerate the current long-term treatment options.

In this study, researchers will find out more about the safety of long-term treatment with dienogest in a large number of Chinese participants. This study will enroll patients from post-menarche to menopause with clinically or surgically diagnosed endometriosis. All of the participants will take dienogest based on their doctor's instructions. They will then visit their doctor's office 3 times over 6 months. During these visits, their doctors will ask them if they have any health problems and about their quality of life. Their doctors will also do tests to measure the pain caused by their endometriosis and any other symptoms.

Inclusion Criteria:

• Signed informed consent.
• Post-menarcheal age through menopause.
• Have clinically or surgically diagnosed endometriosis according to routine clinical practice.
• Decision for the treatment with Visanne was made as per physician's routine treatment practice.

Exclusion Criteria:

• Patients participating in an investigational program with interventions outside of routine clinical practice.
• Any contraindication according to Visanne Chinese label

Chinese patients from post-menarche to menopause diagnosed with endometriosis, either surgically or clinically, and prescribed with Visanne by a physician according to China's health authority approved label.

Availability of this study's data will later be determined according to Bayer's commitment to the EFPIA/PhRMA "Principles for responsible clinical trial data sharing". This pertains to scope, timepoint and process of data access. As such, Bayer commits to sharing upon request from qualified researchers patient-level clinical trial data, study-level clinical trial data, and protocols from clinical trials in patients for medicines and indications approved in the US and EU as necessary for conducting legitimate research. This applies to data on new medicines and indications that have been approved by the EU and US regulatory agencies on or after January 01, 2014.

Interested researchers can use www.vivli.org to request access to anonymized patient-level data and supporting documents from clinical studies to conduct research. Information on the Bayer criteria for listing studies and other relevant information is provided in the member section of the portal.