Freezing of gait (FOG) is a common and debilitating symptom in patients with Parkinson's disease (PD), characterized by sudden and brief episodes of inability to produce effective forward stepping. FOG is a major risk factor for falls, and greatly contributes to reduced mobility and quality of daily life. Treatment of FOG has been perceived as a very challenging task. Although various treatment approaches exist, including pharmacological and surgical options, evidence is inconclusive for many approaches and no clear treatment protocols are available until now.