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.
1 In doing so, it often leads to twitching of the thumb or index finger. 2  Carpel tunnel syndrome is common in people that perform repetitive movements with the hand or wrist either for their occupation or hobby such as a designer, painter, factory worker or golfer.