why does this happen + also myasthenia gravis

does anyone else get really shaky in the arms?? sometimes feels like muscle spasms. i went to my primary care doctor and she said it’s nothing to be concerned about seeing it happens on both sides but i definitely think it’s my left arm more. i’ll be typing on my laptop and it just shakes.

my mom got diagnosed with myasthenia gravis about a year ago, for those who don’t know its a neuromuscular autoimmune disorder. it’s not genetic or hereditary but i honestly feel like it traumatized me, making me realize if this can happen to my mom who has been healthy her entire life then it can happen to anyone. by all means i do not think i have this but its left me paranoid constantly about my own health.

with that being said does anyone else’s arms just kind of get jittery from time to time?