Why may Tourette syndrome get progressively worse in some children as they age, while others simply grow out of it?

Tics often get worse when a person feels stressed, tired, anxious, or excited. They can become better when a person is calm or focused on an activity. Usually they aren't a severe problem. If a child has Tourette syndrome, the tics usually start when he or she is between 5 and 10 years old. Tourette Syndrome is neither a progressive nor degenerative disorder; rather, symptoms tend to be variable and follow a chronic waxing and waning course throughout an otherwise normal life span. It usually starts during childhood, but the tics and other symptoms usually improve after several years and sometimes go away completely. There's no cure for Tourette's syndrome, but treatment can help manage symptoms.

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