Anxiety and Panic Attacks: What Your Body Is Actually Doing and What You Can Do About It

Why the Distinction Matters

People often use "anxiety" and "panic attack" interchangeably, as though they are simply different intensities of the same thing. In my clinical work I see this confusion cause real harm — not because the words matter in themselves, but because misreading what is happening in your body leads to responses that make things worse rather than better. Sitting still and waiting it out is the right move for one; actively grounding yourself is more useful for the other. Getting clear on which is which is not a luxury. It is practical.

I want to walk you through what each experience actually looks like — how it starts, what it does to your body, how long it lasts, and what the evidence tells us about responding to it. I am a psychologist, not your doctor, and nothing here replaces an individual assessment. But I can give you a map.

How Anxiety Begins and Why It Lingers

Closely related: aDHD in Adults and when the Ground Feels Like It's Moving.

Anxiety is a state of sustained threat appraisal. Your nervous system has concluded — rightly or wrongly — that something dangerous or uncertain is on the horizon, and it keeps that conclusion running in the background like an open browser tab. The onset is usually gradual. You notice a low hum of unease, a tightness in the chest, a restlessness in the legs, a mind that keeps returning to the same worry like a tongue to a sore tooth.

Physiologically, anxiety activates the hypothalamic-pituitary-adrenal axis. Cortisol rises, heart rate increases modestly, muscles hold a low-level tension, digestion slows. These changes are real and uncomfortable, but they unfold over hours or days. The amygdala — the brain's threat-detection centre — is sending a steady signal rather than a sudden one. Because the signal is continuous, the body never fully returns to baseline between spikes. That is why anxiety builds and lingers: the alarm is never fully switched off.

Common physical signs include persistent muscle tension (especially neck and shoulders), difficulty falling or staying asleep, fatigue from sustained vigilance, an unsettled stomach, and a quality of thought that feels circular and hard to interrupt.

How a Panic Attack Begins and Why It Peaks So Fast

A panic attack is a discrete, acute surge of fear or intense discomfort that reaches its peak within approximately ten minutes. This is not a description I invented — it is part of the clinical definition used in diagnostic practice. The onset can feel entirely unpredictable, even when one is apparently calm.

What happens physiologically is a sudden, full activation of the sympathetic nervous system — the fight-or-flight response firing at maximum intensity. Adrenaline floods the bloodstream. Heart rate can jump sharply. Breathing accelerates, which lowers carbon dioxide in the blood and produces tingling in the hands and face, dizziness, and a sensation of unreality. The body is behaving as though a physical threat is immediate and lethal. There is no sustained cortisol slow-burn here; this is a fast, explosive cascade.

The reason it peaks and then subsides is biochemical. The adrenal surge is powerful but short-lived. The body cannot sustain that level of activation for long; it is metabolically expensive. Most panic attacks resolve within twenty to thirty minutes. This is important to hold on to when you are in the middle of one and feel certain that something catastrophic is happening.

Telling a Panic Attack from a Heart Problem

This is perhaps the most important practical question I am asked. A panic attack and a cardiac event share several symptoms: chest pain, racing heart, shortness of breath, a sense of doom. Here is how clinicians and researchers describe the differences in pattern:

If you are in any doubt, call emergency services. A panic attack will resolve on its own; an untreated cardiac event will not. I am not asking you to diagnose yourself in the moment — I am asking you to err on the side of caution. Once you have had a medical evaluation and cardiac causes have been ruled out, you can work with a professional on interpreting future episodes.

What to Do in the Moment

The strategies that help depend on what you are dealing with.

For a panic attack, the most evidence-supported immediate strategy is controlled breathing with an extended exhale. Breathing out for longer than you breathe in activates the parasympathetic system and begins to slow the sympathetic response. Try four counts in through the nose, hold briefly, six counts out through the mouth. Do this for five cycles before evaluating whether it is helping.

For anxiety, the impulse to seek reassurance — asking someone to confirm you are safe, checking symptoms online, rereading that work email — tends to relieve discomfort briefly and then amplify it. What helps more is scheduled worry time: a specific fifteen-minute window, at the same time each day, where you allow yourself to engage with the concern fully. Outside that window, you practise redirecting attention when the worry arises, rather than engaging with it.

If you want a clearer read on where your anxiety sits right now, our Free Anxiety Test takes a couple of minutes and needs no sign-up.

When the Pattern Becomes Panic Disorder

A single panic attack, distressing as it is, does not constitute a disorder. What shifts the picture is what happens in the weeks that follow. If you find yourself persistently worried about having another attack, altering your behaviour to avoid situations where one might occur — avoiding exercise because it raises your heart rate, avoiding crowded spaces, stopping activities that brought you pleasure — this is the pattern that clinical practice identifies as panic disorder.

The mechanism behind this escalation is well understood. Fear of the sensations of panic leads to hypervigilance toward those sensations. Noticing a slightly elevated heart rate becomes threatening, which triggers anxiety, which raises heart rate further, which confirms the fear. This is the interoceptive fear cycle. Left unaddressed, it can narrow a person's life considerably.

Cognitive Behavioural Therapy, and specifically its component called interoceptive exposure — gradually and deliberately producing the feared physical sensations in a safe context — has the strongest evidence base for breaking this cycle. If you recognise this pattern in yourself, that is the direction worth exploring with a qualified professional.