For a few years now, the word “trigger” in popular use has expanded to include things that would previously been called “squick.” And it’s kind of too bad, and too bad “squick” has remained subcultural, because it’s really useful to distinguish the thing that grosses you out and upsets you a and just makes you want to nope out — from the thing that will (re)traumatize you. Squick is that first thing, in the subcultures where it’s used.