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In page Sydenham's chorea:

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There is usually a loss of fine motor control, which is particularly obvious in handwriting if the child is of school age. Speech is often affected (dysarthria), as is walking; legs will suddenly give way or flick out to one side, giving an irregular gait and the appearance of skipping or dancing. Underlying the abnormal movements is often low tone (hypotonia) which may not become obvious until treatment is started to suppress the chorea. The severity of the condition can vary from just some instability on walking and difficulty with handwriting, to the extreme of being wholly unable to walk, talk, or eat (chorea paralytica).[citation needed]