The guy I used to work with trembling hands only when he tried to do some really close work like soldering, so I had to do it for him...............
Coincidentally, I also used to work with a fellow with trembly hands. It was what you might call a very fine tremor — not terribly dramatic, but constant and affected his ability to do detailed or close work. I forget his explanation (it was many years ago!) but he’d had it for his entire adult life. His mind was quite sharp. Nice guy and a wonderful colleague! I hadn’t thought about him until this Merkel mystery . . .