What happens in the body during a panic attack - minute by minute

“I don’t know what happened. I was standing in a queue and suddenly it grabbed me.”

That is almost always how the description starts. Then comes the part people say more quietly: that they thought they were dying, that time stretched, that they lost track of where they were. And at the end, the question I hear from nearly everyone: “What was actually happening to me?”

This post answers exactly that. Not how we treat panic, and not breathing techniques — only what happens in the body, in order, from the first sign to the moment it collapses. In my experience this is one of the few explanations that genuinely eases the next attack. Not because it prevents it, but because it makes it comprehensible.

Second zero: the alarm goes off before you know

The first thing to understand is the lag. The decision to raise the alarm is not made in the part of the brain that thinks. It is made deeper and faster.

The amygdala is an almond-sized structure that continuously assesses whether something is dangerous. Information reaches it by two routes: a fast one straight from the senses, and a slower one through the cortex, where things get considered. The fast route is a few tens of milliseconds shorter. That sounds trivial, but it is the reason the body is already running the alarm while you are only starting to wonder what is going on. I wrote about these structures in more detail in the post on what happens in the brain during anxiety.

An important consequence: you cannot stop a panic attack by deciding to in the first second, because in that second it is not yet yours. The first moment is not your fault and not your choice.

The first ten seconds: adrenaline is already in the blood

The amygdala switches on the sympathetic branch of the nervous system and at the same time sends an order to the adrenal glands. They release adrenaline. The nerve part acts almost instantly, the hormonal part within seconds.

What happens in ten seconds: the heart beats harder and faster, the vessels in the skin and gut narrow, the vessels in the large muscles widen, the liver releases sugar into the blood, the pupils dilate, sweating increases, the muscles tense and wait for an order.

All of it is prepared for one thing: running or fighting. The body knows no difference between a bear and a queue at the till. It does exactly the same thing.

Ten seconds to one minute: the body supplies answers nobody needed

Here come the symptoms a person first notices. The heart pounds hard enough to be heard in the ears. The chest tightens, because the muscles between the ribs have gone taut and breathing has become fast and shallow. The hands shake. The mouth goes dry.

This minute also contains the pivotal turn that makes ordinary fright into a panic attack: you notice your own body and become frightened of it. The thought “something is wrong with me” is, to the amygdala, fresh evidence of danger. The alarm gets confirmed and grows louder. From here on the trigger is no longer outside; the trigger has become you.

Minute one to three: too much oxygen, not too little

This is the part almost everybody gets wrong. During panic a person breathes faster and deeper than necessary. So there is enough oxygen — there is too much. What is being lost is carbon dioxide.

As the level of carbon dioxide in the blood drops, the blood becomes slightly more alkaline and the vessels in the brain narrow. The result: dizziness, blurred vision, tingling in the fingers and around the mouth, and the feeling that you cannot get a proper breath. That last feeling is the most treacherous, because it convinces the person to breathe even harder — which deepens the whole thing.

If you have ever been told that during an attack you are “running out of oxygen”, you were told wrongly. The opposite is true.

Minute three to ten: the peak

The diagnostic description says a panic attack peaks within minutes. In practice that is most often between the third and the tenth minute. The peak is the part people describe with the strongest words: that they were certain they would die, go mad, or collapse in the middle of a shop.

At the peak, derealisation is common too — the world looks like a picture, sounds are distant, your own hands feel foreign. That is not a sign your mind is coming apart. It is the result of narrowed attention and altered blood flow in the brain. If it helps, picture the brain closing every programme so that one has enough power.

The peak also often brings an urgent sense that you must get out immediately, into fresh air, home. That impulse is logical: the system is prepared to flee, and it is demanding flight.

One more thing about the peak is worth knowing: this is where experience and measurement diverge most. A person is convinced their pulse is racing towards two hundred, while the reading often shows a hundred and twenty or thirty. They are not making it up. During an attack the perception of one’s own body is strongly amplified — the same pulse you would not even notice while running booms like a drum in the queue at the till.

Why the peak has to pass

To me this is the most important part of the whole story. A panic attack cannot drag on indefinitely, because the chemistry will not allow it.

Adrenaline has a very short life in the blood — measured in a few minutes, not hours. Enzymes break it down. At the same time the parasympathetic branch of the nervous system switches on, the opposite pole: it slows the heart, relaxes the vessels, brings digestion back. The body has a built-in brake that engages by itself.

So I can say something that sounds bold and is nonetheless true: the attack will run out even if you do nothing. Everything people do during an attack — go outside, splash water on their face, ring someone, breathe by a method — happens alongside a running-out that would have happened anyway. That is worth knowing, because otherwise a belief forms that “the cold air saved me”, and after that you cannot go anywhere without cold air.

Minute ten to thirty: the run-out

The curve falls, but not in a straight line. In this phase whole-body shaking is common — the muscles are burning off energy that was readied for running and never used. Many people cry here without being sad. Some feel a wave of heat, others a chill.

A second, smaller wave is also common: just as you think you are settling, everything briefly rises again. It is usually smaller than the first. It happens because you checked your heart and were frightened that it had not fully quietened.

What is interesting is how unevenly the individual symptoms retreat. The pulse settles relatively quickly, within minutes. Tingling takes longer, because the carbon dioxide level has to climb back. Tension in the shoulders and jaw can stay until evening — muscles readied for a leap do not relax the moment the danger is called off. That is why people afterwards keep asking whether it is really over. It is; the body simply tidies up in stages, not all at once.

The hours after: the tail of the attack

The attack ends; the exhaustion stays. Afterwards people often fall asleep, or walk around all day as though wrapped in wool. There is a simple reason: in ten minutes the body spent energy it usually spreads across a day, and after adrenaline comes cortisol, which lingers in the blood far longer.

In those hours a person is also more sensitive. The threshold for the next alarm is lower. That is why a second attack often comes the same day or the next morning, and why the day after an attack is not the right day for large decisions about your life.

If arousal stays high in between attacks as well, it shows at night. On how raised arousal wrecks sleep, I wrote in the post on hyperarousal and insomnia.

Why it feels as though it lasted an hour

Almost everyone I ask overestimates the duration. An attack that took twelve minutes by the clock is stored in memory as half an hour.

This is not exaggeration. Under strong arousal the brain records more densely — more frames per second, to put it crudely — and a denser recording is read back later as longer. People know the same effect after road accidents. So the clock and your sense of it are not in conflict; they are measuring different things.

Where this timeline does not hold

Now an honest limit, because it would be wrong to sell a curve as a law.

First: many attacks do not come as a single wave but in series. Three shorter ones over two hours, each with its own peak, are experienced as one attack lasting all morning. The curve in the picture then describes not the day but one wave inside it.

Second: studies using portable monitors found something that dents the word “sudden”. In a proportion of people, bodily changes began some tens of minutes before the moment the attack was noticed. So it did not begin at second zero; that is only when you saw it. The subjective start and the physiological start are not the same point.

Third: something that lasts two hours is, by description, usually not a panic attack but high anxiety. The difference is not in severity but in mechanism — and in what helps. Anyone expecting a two-hour anxious episode to pass in ten minutes like an attack will be frightened for no reason.

Fourth: in people with a traumatic history, panic often does not follow this scheme. Instead of arousal there can be freezing — a falling pulse, numbness, the sense of having left your body. I wrote about that in the post on trauma in the body.

And fifth: for some people this explanation will be no use at all. If it becomes a new instrument of control — timing the minutes, counting beats, checking whether it is “following the curve” — it has done harm. Then it is better to set the explanation aside and work on why everything has to be under control.

What this timeline changes in practice

Once someone knows the attack has a shape and an end, what they do during it changes. Instead of fighting the symptoms, the task becomes surviving a few minutes to the peak and letting the body do its work.

The reading of the symptoms changes too. Tingling is not a sign of a stroke but a consequence of breathing. Unreality is not madness but narrowed attention. Once a thought is given a different name it loses some of its force — on how that shift is made, I wrote about catastrophising.

And third: a first attack deserves one visit to a doctor. Not because the attack is dangerous, but so that something else is ruled out once and that worry is moved out of the way. On why normal test results do not mean you invented your symptoms, I wrote separately.

What to remember

A panic attack has a course: the alarm in the first second, adrenaline within ten, full symptoms in the first minute, a peak between minutes three and ten, then a decline and a long tail of fatigue.

The peak has to pass, because adrenaline breaks down and the opposing system switches on. That is not consolation, it is chemistry.

There is not too little oxygen but too much; most of the frightening sensations come from breathing too fast, not from disease.

And if it seemed to last an hour, you were not lying. Your memory simply measures differently from a clock.