Realize that with tourette's it's not voluntary, and it's extremely distressing most of the time. Tourette's often follows a distinct pattern. Starting as a child most get very subtle tics, blinking, facial twitches, then as the years progress they get more complicated. They typically peak in early adolescence and then almost vanish. Those of us with comorbid conditions such as OCD are more likely to have them continue into adulthood.
I have a moderate case of Tourette's, which has resurfaced after a few years of becoming more subtle. My mother also had the condition, though her's vanished in early adolescence and she doesn't have any comorbid conditions. It is genetic, so look for tics in your family. Technically in the DSM4, you cannot be diagnosed with Tourette's with Autism, UNLESS you have primary inherited tourette's.
The reason why is that Tourettism is associated with other disorders. Tourettism is the appearance of tics without primary Tourette's. ASDs, Schizophrenia, and a few other disorders can cause tics. This doesn't mean that you have Tourette's however.
In my case I have primary Tourette's with secondary OCD and Autism.
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Severe Tourette's With OCD Features.
Reconsidering ASD, I might just be NVLD.