Noun
English Wikipedia has an article on:dystoniaWikipedia
dystonia (countable and uncountable, plural dystonias)
(pathology) A disabling neurological disorder in which prolonged and repetitive contractions of muscles cause jerking, twisting movements and abnormal postures of the body
I burned out my drawing hand by using it too much. The common word for it is writer's cramp. The fancy words for it are focal dystonia. The symptom in my case was a pinky finger that went spastic when I tried to draw. Scott Adams
About half of patients have associated dystonia, including cervical dystonia, writer's cramp, spasmodic dysphonia, and cranial dystonia, and 20% of the patients had associated parkinsonism. Source: Internet
Meige syndrome movement disorder that can involve excessive eye blinking (blepharospasm) with involuntary movements of the jaw muscles, lips, and tongue (oromandibular dystonia). Source: Internet
In addition, the person's affected limbs may be rigid or have muscle contractions causing strange repetitive movements ( dystonia ). Source: Internet
Motor functions may slow as rigidity and dystonia appear. Source: Internet
The tremor may be the initial sign of dystonia localized to a particular part of the body. Source: Internet