system
What causes shaky hands with nervousness?
human
I will think about something (ususally things in the future I have to do or second quessing the past) and feel nervous inside and them my left hand will shake.  The nervousness inside will subside.  I have this happen maybe every other day.  What can be the problem?
gpt
Dear friend, it appears from your description of your problems that you are having anxiety related to your thoughts and excessive preoccupation over the same. I feel you are having a underlying anxiety disorder like generalised anxiety disorder etc. For which treatment is available both medicines and psychotherapy.  You should consult a psychiatrist near by and discuss your problems.