triggering

US /ˈtrɪɡ.ɚ.ɪŋ/
UK /ˈtrɪɡ.ɚ.ɪŋ/
1.

kích hoạt

causing a strong emotional reaction of fear or worry because someone is made to remember something bad that has happened in the past:

:
For people with PTSD, loud noises can be triggering.