Movement disorders aren’t always identified as irregular movements. Freezing in Parkinson’s disease (or motor block) happens when there is a brief temporary inability to move. Many patients with Parkinson’s also experience “Freezing of Gait” (FOG), a disturbance in a patient’s ability to walk. Irene Malaty, MD, Associate Professor of Neurology at the University of Florida, explains the causes and symptoms of freezing for the National Parkinson’s Foundation.