ToolBox Talk #42: HAND ARM VIBRATION SYNDROME (HAVS) As the majority of our operations involves working with our hands in some capacity whether it is hitting a hammer, using power tools, What's causing your shaky hands? Harvard Health When Should You See an Orthopedic for Thumb Twitching? My fingers sometimes shake. Especially if I move one next to the other, like pinky next to index or index next to the middle finger. Is this an essential tremor? : r EssentialTremor Hand Arm Vibration Syndrome Causes and Prevention NASP