Dystonia is caused by incorrect signals from the brain to the affected body part but the causes for this are not yet fully understood.

  • Simple writer’s cramp is thought to usually be caused by over-use of the hand, poor writing posture or poor pen hold.
  • Dystonic writer’s cramp is thought to be affected by dystonia in other parts of the body.
  • Musician’s dystonia is thought to be caused by the repetitive hand movements, which result in remapping of the receptive fields in the cortex of the brain.