Longitudinal Endpoint Assessment of Disease Burden in HD

Who May Qualify: - Be 18 years of age or older; - Be willing and able to provide willing to sign a consent form electronically; - Self-report, when answering as a participant, that you have been diagnosed with HD by a doctor, or have undergone genetic testing and been found to carry the gene mutation responsible for HD but have not been clinically diagnosed with HD (prodromal HD); - Have the ability to answer online questions or direct someone else to enter answers for them; - Have the ability to ambulate independently and take care of some of your personal needs; - Have the ability to read and understand English; - Be willing to create a unique identifier based on personal demographic information; - Reside in the United States or its territories. Surveys can only be completed in the US. If you move outside of the US, you will no longer be able to participate; - Own or have access to an electronic device and secure internet connectivity Who Should NOT Join This Trial: \- Always talk to your doctor about whether this trial is right for you.