Dystonia is a neurological condition believed to be caused by a chemical
imbalance in the brain. It is one of the most common movement disorders
affecting more than 40,000 people in the UK. I googled and read that it's "a
neurological movement disorder characterized by involuntary muscle
contractions, which force certain parts of the body into abnormal, sometimes
painful, movements or postures. Dystonia can affect any part of the body
including the arms and legs, trunk, neck, eyelids, face, or vocal cords.
If dystonia causes any type of impairment, it is because muscle contractions
interfere with normal function. Features such as cognition, strength, and
the senses, including vision and hearing are normal. While dystonia is not
fatal, it is a chronic disorder and prognosis is difficult to predict."

I've never heard of the name but something about it sounds a little
familiar.

Does anyone know more about it?

Mary