I suffer from Cervical Dystonia which is uncontrollable muscle spasm in the left side of my neck. It came where I experience severe whiplash in my neck from a car wreck. I also suffer from a extensive nerve damage from another car wreck. This condition is called Reflex Sympathetic Dystrophy or RSD for short. I received a lot of nerve damage in both of my arms from where the turn signal went thru one hand and my arm was broke into. My arm was broken so bad that it severed the nerves in my arm. I hope this will help answer some questions. You can also look up Dystonia and it will list the different kind of Dystonia that people suffer from.