In a second subtype, SD symptoms are accompanied by a voice tremor. A third subtype involves a primary voice tremor that is so severe the patient experiences adductor voice stoppages during the tremor. SD may also be referred to as Laryngeal Dystonia. For causes, treatments, research information, etc. Writer's cramp is a task-specific focal dystonia of the hand.
Symptoms usually appear when a person is trying to do a task that requires fine motor movements.
The symptoms may appear only during a particular type of movement, such as writing or playing the piano, but the dystonia may spread to affect many tasks. People with simple writer's cramp have difficulty with only one specific task. The symptoms usually begin between the ages of 30 and 50 years old and affect both men and women. For causes, treatments, research information, etc. The spasms may spread to involve twisting contractions of other parts of the body.