what is dystonia ?

Dystonia is a neurological movement disorder, in which sustained muscle contractions cause twisting and repetitive movements or abnormal postures.[1] The disorder may be hereditary or caused by other factors such as birth-related or other physical trauma, infection, poisoning (e.g., lead poisoning) or reaction to pharmaceutical drugs, particularly neuroleptics.[1] Treatment is difficult and has been limited to minimizing the symptoms of the disorder, since there is no cure available.

Classification
Types of dystonia
    Generalized
    Focal
    Segmental
    Sexual
    Intermediate
    Psychogenic
    Acute Dystonic Reaction
Generalized dystonias
    Normal birth history and milestones
    Autosomal dominant
    Childhood onset
    Starts in lower limbs and spreads upwards
    Also known as "idiopathic torsion dystonia" (old terminology "dystonia musculorum deformans")
Focal dystonias