http://theconversation.com/whats-the-difference-between-traumatic-fear-and-moral-anger-trigger-warnings-wont-tell-you-77365 To trigger something is therefore not just to bring it about in some general sense, but to cause it in a way that is mechanical and automatic, like a reflex. Pollen is an asthma trigger because it sets off muscle contractions in the airways among people who are sensitiveContinue Reading