Parkinson's is virtually unheard of in teenagers, so it could be benign essential tremor, which although bothersome, is of no medical significance. Is it a shakey, fine tremor or does the whole thumb actually jerk?
Sometimes, in people your age, isolated twitching can be something known as benign fasiculation syndrome. It's not serious . (Note the word "benign"!) Fasciculations are muscle twitches.
If it continues and is really bothering you, see your doctor just to put your mind at ease if nothing else!
zuzu
[This message has been edited by zuzu8 (edited 06-08-2003).]
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twitch/tremor in left thumb. what could it be? 
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