I'm on lithium and it makes my hands tremble like crazy, sometimes people notice that and ask questions. I don't mind discussing it with my friends, but I don't want to explain this whole thing to people I don't know that well. I wonder if there's some easy answer to quench their curiosity? 

I know I can always say that I have Parkinson's, but I don't want to misrepresent people who actually have it.