The characteristic signs and symptoms of progressive supranuclear palsy include: 
A loss of balance while walking. A tendency to fall backward can occur very early in the disease.
An inability to aim your eyes properly. You may not be able to look downward, or experience blurring and double vision. This difficulty with focusing the eyes can make some people spill food or appear disinterested in conversation because of poor eye contact.
 Additional signs and symptoms of progressive supranuclear palsy vary and may mimic those of Parkinson's disease and dementia. They generally get worse over time and may include: 
Stiffness (especially of the neck) and awkward movements
Falling, especially falling backward
Slow or slurred speech
Problems with swallowing, which may cause gagging or choking
Sensitivity to bright light
Sleep disturbances
Loss of interest in pleasurable activities
Impulsive behavior, or laughing or crying for no reason
Difficulties with reasoning, problem-solving and decision-making
Depression and anxiety
A surprised or frightened facial expression, resulting from rigid facial muscles
Dizziness
