Dear doctor, I have a strange tingling in my right hand. When the left side of my thumb (below the joint) rubs against anything, this triggers a tingling (like a minor electric discharge) in the right side of my ring finger (below the nail). It is not painful but very disturbing. It started 6 months ago, lasted 1-2 months, went away, then came back a month ago - every time with no obvious reason. FYI I am a vegetarian but have sufficient B12 level. And otherwise in good health, 40-year old male. Any idea? Should I shrugg this off for now or should it be investigated quickly? Thanks a lot for a first advice.