HD symptoms usually manifest cognitively, physically or emotionally. The symptoms vary widely from person to person, even within the same family. Which symptoms appear first vary greatly among patients.  During the course of the disease, some symptoms appear to be more dominant or affect capability.  For some, involuntary movements may be more dominant, even in the early stages of the disease, while for others these movements may be less evident and emotional/behavioural symptoms more evident. Below are the most common symptoms of HD.