Parkinson's disease is the second most common neurological illness, associated with early prominent death of dopaminergic neurons leading to a movement disorder with classical parkinsonian motor features and further non-motor complications. Freezing of gait is among the most disabling, complex and less known symptoms, in terms of clinical expression, pathogenesis and treatment. It is expressed as sudden and brief episodes of inability to produce effective stepping, as if feet are glued to the floor. Consequently, freezing is a major concern in Parkinson’s disease management due to its link to falls and poor quality of life. Nevertheless, it is surprisingly difficult to assess in daily clinical practice, as it is mainly self-reported by patients or caregivers and particularly troublesome to be elicited and estimated in hospital settings.