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.
Often, patients wake up to find their affected finger or thumb in a locked flexed position, which creates a restless sleep pattern. Furthermore, trigger fingers and thumbs creak upon flexion and extension. The cause of trigger finger or thumb is repetitive movement, with increased degrees of motion, time and clenching.