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Historical features suggestive of a functional etiology
| Onset at a precise moment in time |
| Waxing and waning course; even temporary complete remission |
| Change in the nature of the movement over time |
| Migration of the disorder around the body |
| Paroxysmal nature |
| Presence of the disorder only in certain circumstances |
| History of stress, anxiety or depression |
| History of prior possible functional disorders |
| Secondary gain |
| Fatigue |
| Disability exceeds the symptoms |
