My mom's hands shake some, but it's because she's an alcoholic. So, you know, there are lots of reasons it can happen, so I wouldn't pry, either. What I do when I encounter a situation like that is ask, "Can I help with that?" whatever the task may be. Like I offer to open doors for people in wheelchairs (or moms with strollers), and I offer to help little old ladies who can't reach the top shelf in the grocery store (I usually volunteer my husband or my son for that one cuz I'm short, too). I don't just DO it without asking, though. Otherwise, it's none of my business why my friend/coworker/stranger has an obvious tremor/wheelchair/shortness. :)
If they want to tell me, as a result of my offering, then I might then be willing to listen. Of course, if I had a good friend with an obvious tremor, I'd be really concerned about her health and have to ask about it. It'd be my duty as her friend.
Karen

