You may use a certificate of citizenship or a naturalization certificate, to prove that you are a US citizen. But both the documents are not the same. A US citizenship certificate is granted to a person who acquires or derives citizenship from his US citizen parents.
Causes Of Twitching Of Fingers And Thumb. 1  Carpel tunnel syndrome causes twitching of muscles as the median nerve through the carpel tunnel becomes compressed. 2  A less disconcerting cause is muscle cramps that happen when small muscles in the hand contract.
If you suspect carpal tunnel syndrome is the cause of your involuntary thumb twitching, your best bet is to see a doctor, but there are a few tests you can do at home just to make sure: Tapping over carpal tunnel area â if this tapping results in sharp pain radiating towards your fingers, chances are you have CTS.