Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
These twitching or pulse in stomach especially in mid abdomen is present in everyone as there is an underlying large artery
known as aorta
. These pulsation are more in thin and slim persons.So I don't think there is nothing to worry
I hope I have answered your query and this will help you. Remain in touch and get-well soon.