Episodes are relatively short-lived, lasting anywhere from 5–30 minutes, and in most cases disappear completely after cessation of the physical<unk> . Most patients will experience 1 to 5 episodes per month, but some can have attacks daily. The muscles most often affected are usually in the legs and feet (75% of reported cases), but the upper body muscles such as the arms, face, neck, and trunk have also been observed to be affected during the episodes of dystonia. Age of onset is usually sometime in childhood, but can range from 1–30 years old. In one study it was found that the mean age of onset was around 8 years. Similarly in the study, the legs were the most common affected part of the body and the attacks were reported as stiffening and cramps by those affected. During an episode of PED patients find walking nearly impossible. Cerebral spinal fluid analysis showed a two-fold increase of homovanillic acid and 5-hydroxyindoleacetic acid immediately following<unk>  compared to normal levels. This indicated that increased dopaminergic transmission could contribute to PED and other<unk>  dyskinesias. Neurological examinations, EEG, and brain imaging are all normal in PED patients.
Paroxysmal exercise-induced dystonia
Dopamine-responsive dystonia
Paroxysmal kinesigenic choreoathetosis
Potassium-aggravated myotonia
Post-encephalitic parkinsonism
Benign fasciculation syndrome
Levodopa-induced dyskinesia
Myotonia congenita