What could it possibly mean when your eyelids are involuntarily twitching?

Happy 4th of July! : )

Now to the most relevant question of the day. Lol.
I know this condition is something for a doctor to eventually diagnose. But I’m curious about whether anyone here had the same experience. Involuntary eyelid twitching. On and off. In my left eye. Could it be because of too much staring at the computer for hours? What could be the worst case scenario here? Thanks!