Dystonia: Medical Definition, Symptoms, and Causes

Dystonia is a neurological movement disorder characterized by sustained or intermittent involuntary muscle contractions causing twisting, repetitive movements, or abnormal postures.

Medical Classification

Often termed a "muscle tone disorder" due to abnormal co-contraction of agonist/antagonist muscles.

Common Presentations

• Focal: One body part (cervical dystonia/torticollis, blepharospasm, writer's cramp)
• Segmental: Adjacent regions
• Generalized: Multiple areas, often childhood-onset
• Task-specific: Only during certain activities (musician's dystonia)

Causes

• Idiopathic (primary)
• Genetic (DYT1, DYT6, etc.)
• Acquired: stroke, TBI, drugs (antipsychotics → tardive dystonia), hypoxia, Wilson's disease

Treatment

• Botulinum toxin injections (focal)
• Oral medications (anticholinergics, baclofen, benzodiazepines)
• Deep brain stimulation (refractory generalized)
• Physical/occupational therapy, sensory tricks