**Chinese EOPD Registry Study** This study is about creating a database of people in China who have early-onset Parkinson's disease (EOPD). Parkinson's disease is a condition that affects the brain, and EOPD means it starts before age 50. **Key Points:** - **Participation:** This study involves taking clinical tests, giving blood samples, and answering questions about lifestyle factors like smoking or drinking. - **Eligibility:** You can join if you're diagnosed with Parkinson's and it started before age 50, but not if your family has a history of the disease. - **Compensation/Risks:** The description does not mention compensation or specific risks. Doctors will use different tests to understand the disease better, including scales for sleep, movement, and other symptoms. Blood samples will help researchers look at genes, which are like instructions in our body. They will also ask about environmental factors, like exposure to chemicals. This research helps scientists learn more about what causes EOPD and how it affects people in China.