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.
Nervous system conditions that can cause muscle twitching include: 1  Amyotrophic lateral sclerosis (ALS-Lou Gehrig's disease). 2  Neuropathy or damage to the nerve that leads to a muscle. 3  Spinal muscular atrophy.