Dystonia

Dystonia is a condition of neurological movement disorder, in which the muscle sustained and a contractions caused the body to be twisted and performing repetitive movements or abnormal postures.

The disorder may be hereditary or caused by other factors such as birth-related or other physical trauma, infection, poisoning, or reaction to pharmaceutical, particularly neuroleptics

Source: http://www.flashnews4u.com/2010/07/desiree-jennings-health-bizarre-symptoms-and-muscle-disorder/