My fingers are involuntary but sometimes they flicker so much. What might be the reason. Hand Arm Vibration Syndrome Causes and Prevention NASP The vibration source position in this study (a) on the index finger Download Scientific Diagram Spot these Signs of Hand Arm Vibration Syndrome Is your finger shaking or vibrating? , This could be a sign of a nerve or muscle issue, and getting it checked early can make a big difference. , Call 786 615 9879 to book your evaluation,