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.
Smoking and working with vibrating machinery increases the risk of developing Raynaud's syndrome. As the blood vessels leading to the fingers and toes spasm, they become narrower, decreasing the supply of blood and oxygen to the area. This causes the fingers to turn white and feel numb or tingling. Although rare, a severe case can cause the arteries to permanently narrow or become blocked, leading to deformities of the fingers due to lack of blood.