triggeringadjective
uk/ˈtrɪɡ.ər.ɪŋ//ˈtrɪɡ.ɚ.ɪŋ/specializedcausing someone to feel upset and frightened because they are made to remember something bad that has happened in the past:
For people with PTSD, loud noises can be triggering.
a triggering experience