What happens in your brain when you have hypnosis for anxiety

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Anxiety has a way of taking over, both our mind and body. The heart races and the chest tightens. Breathing becomes shallow. There's a block in the throat, hands tremble, thoughts spin. And a feeling of sickness.

For some, anxiety shows up around specific events - a presentation, a social situation. For others, it builds for no clear reason. Regardless, most of us experience it at some point.

Your brain's alarm system—and why it won't turn off

You might know of the amygdala. A small, almond-shaped structure deep in the brain, and its job is to keep us safe by constantly scanning for danger, a little like an installed (and working) smoke detector.

When it detects a threat - whether real or not - it triggers a cascade. It releases CRH (corticotropin-releasing hormone) locally, which activates the hypothalamus, which in turn signals the release of stress hormones such as cortisol and adrenaline. These create the fight or flight response that is often talked about. Your heart rate increases, breathing quickens, blood rushes to your muscles - and away from functions like digestion that aren't needed right now. Your pupils dilate to take in more light, and your body releases glucose for quick energy. All of this happens before your thinking brain has even had time to assess whether there's actual danger.

For people living with anxiety, this alarm system can become overactive - like the smoke detector going off every time you make toast. The system is working exactly as it should, just working overtime.

Your brain is simply trying to protect you, but sometimes, it needs a little help recalibrating.

What hypnosis does within your brain

So what happens during hypnosis as part of a hypnotherapy session?

There seems to be a decrease in the activation of the amygdala and other areas associated with fear responses. The overactive alert system quietens down. You're creating conditions where it can finally rest.

Studies show that during hypnosis, activity decreases in the dorsal anterior cingulate cortex and connectivity increases between the prefrontal cortex and the insula (Jiang et al., 2017). What does this mean? The part of your brain that constantly monitors for threats becomes less active. Meanwhile, the parts that help you regulate emotions work together more effectively.

A comprehensive analysis of multiple studies found that people receiving hypnosis reduced anxiety more than about 79% of those in control groups, with benefits improving over time. At follow-up appointments, participants who'd received hypnosis showed even greater improvements, outperforming about 84% of control participants (Valentine et al., 2019).

This isn't about ‘fixing’ you or controlling your brain. It's about helping your brain rediscover its natural capacity for calm - something that was always there, just overshadowed by that overactive alarm system.

Three brain networks finding their rhythm

To understand the effects more deeply, it’s useful to know about three interconnected networks in your brain.

Your Executive Control Network is like your wise decision-maker. Centred in the prefrontal cortex, it helps you focus attention, make decisions, and choose how to respond rather than simply react. When you're anxious, this network can become overwhelmed.

Your Salience Network is your alert system and includes the amygdala. Its job is to notice what's important and decide what needs your attention. It processes emotional information and helps you determine what's relevant. When anxiety is high, this network can become hypervigilant, flagging everything as urgent.

Your Default Mode Network is your wandering mind - the voice that narrates your life, reviews the past, and imagines the future. For many people with anxiety, this network gets stuck in loops of worry, replaying fears and catastrophizing about what might go wrong.

Here's what the research shows: during hypnosis, these three networks begin to communicate differently (Hoeft et al., 2012; Jiang et al., 2017). During hypnosis specifically, the connections between your executive control and the constant self-monitoring of your default mode network actually decrease, creating space for focused attention without that running commentary of worry. Meanwhile, the connection between your prefrontal cortex and the areas that process body sensations strengthens, improving emotional regulation (Jiang et al., 2017).

It's like three people finding a better way of working together, each doing their job without overwhelming the others. We're still learning exactly how these brain changes translate into lasting relief, but the research shows that people who receive hypnosis show a reduction in anxiety, and this can be more effective when used alongside other psychological interventions (Valentine et al., 2019).

Why this matters for your journey

You might be wondering: why does all this neuroscience matter? Why not just focus on the experience itself?

Because understanding what's happening is helpful. When you know that hypnosis creates measurable changes in your brain — changes that researchers have been able to observe in controlled studies, particularly among people who respond well to hypnosis — it helps you trust what you're experiencing. This isn't just 'relaxation' or 'positive thinking'. This is about finding new patterns of response.

Research has shown that hypnotherapy is effective in treating anxiety. It reduces sympathetic nervous system activation (the system that fires you up) and increases the parasympathetic nervous system (the system that helps you rest and restore, often known as ‘rest and digest’) (Leo et al., 2024; Hammond, 2010). Your body shifts from a state of constant alert to one where healing becomes possible.

This is why hypnosis and hypnotherapy can feel so different from simply trying to relax. You're not fighting against your anxiety or trying to control your brain. You're creating conditions - through focused attention, guided imagery, and carefully chosen suggestions - where your nervous system can find its way back to balance.

A possible next step?

Your brain has an extraordinary capacity for change and healing. Sometimes it just needs a guide to help it remember what it already knows.

If you're living with anxiety, you have a brain that's working hard to protect you. And that same brain, with the right support, can learn to feel safe again.

The next time you notice anxiety rising in your body, try this: place one hand on your heart and take a slow breath. Simply acknowledge what's happening without judgement. "My alarm system is activated right now. And that's okay. I'm safe.”

This small act of awareness - of noticing without needing to fix - is where change begins.

And if you're curious about how hypnotherapy might support your journey, do get in touch.

References

Hammond, D. C. (2010). Hypnosis in the treatment of anxiety- and stress-related disorders. Expert Review of Neurotherapeutics, 10(2), 263-273.

Hoeft, F., Gabrieli, J. D., Whitfield-Gabrieli, S., Haas, B. W., Bammer, R., Menon, V., & Spiegel, D. (2012). Functional brain basis of hypnotizability. Archives of General Psychiatry, 69(10), 1064-1072.

Jiang, H., White, M. P., Greicius, M. D., Waelde, L. C., & Spiegel, D. (2017). Brain activity and functional connectivity associated with hypnosis. Cerebral Cortex, 27(8), 4083-4093.

Leo, D.G., Keller, S.S. & Proietti, R. (2024). Close your eyes and relax: the role of hypnosis in reducing anxiety, and its implications for the prevention of cardiovascular diseases. Frontiers in Psychology, 15, 1411835.

Valentine, K. E., Milling, L. S., Clark, L. J., & Moriarty, C. L. (2019). The efficacy of hypnosis as a treatment for anxiety: A meta-analysis. International Journal of Clinical and Experimental Hypnosis, 67(3), 336-363.