How triggers are formed

We don't know precisely how triggers are formed. Some researchers believe that our brains store memories from a traumatic event differently from memories of non-traumatic event.

Past traumatic events may be interperted by the brain as current. This causes the body to experience symptoms similar to the original trauma (such a the fight and flight response).

We also know that triggers can cause an emotional reaction before a person realizes why they have become upset. Often triggers have a strong sensory connection (a sight, sound, taste, or smell), or are connected in some way to a deeply ingrained habit (for example, a recovering alcoholic who associates a particular activity with drinking).

Some refer to this as "traumatic coupling," where a trigger is connected to a traumatic experience, causing you to relive symptoms.