What Is a Trigger?

‘I remember my friend trying to talk to me about something quite small, but as soon as they started, I could feel myself getting tense. It was like I’d already decided they were criticising me, even though they weren’t. I stopped really listening and felt this rush of anger come up. My tone changed, I became defensive, and before I knew it, I’d snapped at them and said some awful things. Afterwards, I knew my reaction didn’t match what had actually happened, but in the moment, it felt completely real and justified. Why does this happen?’ (Client)

This is something that can happen often, and it can leave us feeling shame, confusion, and upset. So why does this happen?

It may be that you have been triggered.

A trigger is anything that brings up a strong emotional reaction—often quickly and sometimes unexpectedly. It can be a situation, a tone of voice, a memory, or even a look from somebody.

In the example above, the trigger was receiving feedback that felt like an attack on her sense of self. Although this wasn’t the reality, the memory of being criticised and judged as a child was quickly activated.

A trigger is not just about what is happening in the present moment—it’s about how that moment connects to something familiar from the past. It may be:

The child who was never heard or validated
The teenager who learned that conflict was unsafe, after witnessing frequent arguments
The person who felt invisible growing up and alone
The person who had many unmet emotional needs
The person who felt bullied or never “good enough”

These triggers can create reactions that feel so intense because something much deeper has been activated.

Triggers can show up in different ways:

Feeling disproportionately upset when someone doesn’t reply to a message
Reacting strongly to criticism, even when it’s mild
Shutting down or becoming defensive during conflict
Tension in the room which makes you scan everyone and everything

On the surface, these reactions can feel confusing and frustrating. You might find yourself thinking, “Why am I reacting like this?” or “Why has that made me so angry?”

When we begin to look a little closer, triggers often start to make sense. They are not random. They are usually rooted in earlier experiences—times when we may have felt rejected, criticised, ignored, or overwhelmed.

The nervous system holds onto these experiences, even if we are not consciously thinking about them. These memories don’t always show up as clear events, but rather through our emotional responses to present situations that mirror the past.

So, when something in the present feels similar, the body responds as if it is happening all over again.

This is why triggers can feel so immediate and intense. It’s not just about now—it’s also about then, and all the other times you may have felt this way. In those moments, you may feel as though you have been taken back to a younger version of yourself.

Understanding this can begin to shift how we respond to ourselves. Instead of judging or criticising our reactions, we can approach them with curiosity:

“What does this remind me of?”
“When have I felt like this before?”
“What might this part of me need right now?”

This doesn’t mean staying stuck in the past. It means recognising the connection between past and present so that we can respond differently.

This is key—learning to respond rather than react. A reaction is often automatic and impulsive, whereas a response is more considered and intentional, shaped by awareness and choice. 

Triggers are not a sign that something is wrong with you. They are signals—indicating that something important has been touched. They aren’t just disruptions to get past. Although avoiding them may feel protective in the moment, real change often comes from being willing to explore them. With support and awareness, they can become a pathway to healing rather than something we try to shut down.

When we learn to notice them, rather than avoid or suppress them, they can become an opportunity not just for understanding, but for healing.

Over time, with awareness and support, those reactions can soften. What once felt overwhelming can begin to feel manageable—not because the world has changed, but because your relationship with yourself has.  We can then begin to create the possibility for calmer and more secure ways of relating to ourselves and others.