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.
When finger twitching is persistent, the cause can be serious underlying disease. It can due to an abnormality in nerve or in muscles of hands and fingers. Sometimes, continuous finger twitching can be due to a brain related problem. In view of its seriousness, continuous twitching of finger needs to be evaluated by the physician.