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 Hypocalcemia: It is caused due to a deficiency of calcium. 2  The low concentration of calcium leads to an electrolyte imbalance, which causes your index finger to twitch. 3  Again, dietary changes, supplements, and pharmaceutical drugs can cure the ailment.