Many people with mid-stage to advanced Parkinson’s disease (PD) experience “freezing.” Freezing is the temporary, involuntary inability to move. Not all people with PD experience freezing episodes, but those who do have a greater risk of falling. The problem can occur at any time. Some people are more prone to freezing episodes than others. Usually, freezing only lasts a few seconds, but it is one of the more frustrating and often dangerous symptoms of PD.