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.
The exact cause is not known. The symptoms can include pain, stiffness, clicking and a small lump in the palm at the base of the affected finger or thumb. If you think you may have trigger finger, make an appointment to see your GP, so they can examine your hand and offer advice about treatment.