Hi
Welcome to the MedHelp forum!
The involuntary movements in your right index finger could be due to use of vibratory tools. This collectively causes Hand-Arm Vibration Syndrome or HAVS. Injury to motor component of nerves can also cause involuntary movements of the hand/finger. Pinched spinal nerve at lower cervical vertebrae too can be a cause.
The other possible causes are systemic lupus erythematosus or lupus, polycythemia rubra vera, anti-cardiolipin antibody syndrome, stroke or transient ischemic attack, thyroid disease, and disorders of calcium, glucose or sodium metabolism. Rare causes include Sydenham's chorea, Huntington's disease, and Wilson's disease. However, almost all of the above mentioned conditions cause numerous other symptoms apart from the involuntary movements. Brain stem or cerebellar disease including MS, spinocerebellar degenerations, vascular disease, and tumors can also be a cause.
Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP for primary examination followed by proper referral.
Take care!
cud b your nerves in your finger mayb u messed one up that wud cause it to move with out u doing it u shud see a doc