I don't have trauma in my past, but sometimes I can get triggered by things that are too noisy or chaotic, or too much action going on. Sometimes if three things are asking for my attention at the same time, I feel triggered. When I say this, I basically mean my anxiety goes up really fast and my mood goes down and can stay down for a while depending on what happens next. I think their definition is too narrow, but maybe I have been using the term wrong for two years.