Hi there
I would like to advice you first to check easily is it a compress Patten or stretch Patten
can you till us more on the sign and symptoms please
ie radiating pain to where?
Then from there I might be able to advice you
 
			
			 
							Hi there
I would like to advice you first to check easily is it a compress Patten or stretch Patten
can you till us more on the sign and symptoms please
ie radiating pain to where?
Then from there I might be able to advice you
 
			
			 
							Have you looked at the person's posture? The flexion pattern that Parkinson's patients tend to adopt can lead to strain on the soft tissue structures of the neck causing local and distant pain.
They often develop a kyphosis, (flexion) of the thoracic spine and lower cervical, with compensatory hyperlordosis (extension) of the upper C spine in order to achieve functional head position.
Thoracic extension and neck retraction exercises are generally where I'd advise you to start. If he truly has nerve root impingement then these will help too.
Check out Robin McKenzies neck retraction exercises as found in his book "Treat your own neck".