Rosemary, this is no joke. i also have a lot of shoulder pain. Have him checked out by his neurologist and a ortopedic because this could come from a previous injury and manafested into some form of reflex sympathic Dystrophy. It can really do a" whammy" on your PD. Some days when your'e stressed out...the PD can feel like mega pain but it basically has to do with the injury. Debbie Z /PDer /5/95 42years young! Hope this helps out your friend! Tell him all is not lost!!