People with Parkinson's disease are at risk of falling due to gait disturbances, loss of motion control including freezing and jerking, autonomic system disorders such as orthostatic hypotension, fainting, and postural orthostatic tachycardia syndrome; neurological and sensory disturbances including muscle weakness of lower limbs, deep sensibility impairment, epileptic seizure, cognitive impairment, visual impairment, balance impairment, and side effects of drugs to treat PD.[13][14]