Movement disorders are a group of neurological disorders impacting the production and control of movements. People experience excess movements (hyperkinetic) or paucity of voluntary and automatic movements (hypokinetic), unrelated to weakness or spasticity (Fig. 6.1). Movement disorders include some of the most common neurological diseases and diseases that can affect people of any age and gender. The basal ganglia and cerebellum, which were historically considered to primarily have motor function, are the main structures implicated in movement disorders. However, studies have continuously shown that the basal ganglia and cerebellum play a substantial role in different non-motor functions including cognition and behavior, and accordingly, movement disorders include a variety of non-motor symptoms in addition to the traditional motor features (Wichmann, 2018). In fact, several movement disorders include non-motor features in the diagnostic criteria (i.e., progressive supranuclear palsy and corticobasal degeneration).