Which herbs cause hand tremors?

None? I am not aware of any "herbs" causing a hand tremor. Unless you are taking an herbal that has a stimulant in it that may cause some tremor, i just don't know of any. So sorry!
Tremor. High amount of caffeine, thephylline ( tea), theobromine (chocolate) and other stimlants can accentuate tremor if the body isn used to it. Herbs rich in these xanthine alkaloids may also lead to tremor.