Sure....
But Galilean peasants thought that it was demons, or even death. It's not what you or I think but what ancient peasants thought.
And Hysteria could imitate scores of serious physical conditions, and the right person could 'cure' these conditions instantly, sometimes by just attending. I've seen it happen many times.
They just didn't have the right meds,there is also psychosis which I witnessed in amsterdam but we know what triggered that.
I read somewhere that muhammad had seizures and people saw it as something magical,times change but superstition not much.