on action my thumb shakes? what are the causes?!
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You're describing a tremor, of which there are many types.
Tremors can be basically divided into intention and resting tremors. (Though even that is a vague division). What you're describing is an intention tremor since the shaking happens on action. Many intention tremors are benign and associated with aging or heredity, but not all of them are.
Find yourself a neurologist. There are tons of simple maneuvers they'll put you through which will help diagnose the tremor.
Good luck!
Other Answers:
could have a trapped nerve or have your hand in a position that traps it for a couple of seconds
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