Why a panic attack is not dangerous, even when it feels like a heart attack

“I know what you are going to say. That it isn’t dangerous. But you weren’t in that car.”

He was right. I wasn’t. And I know how empty the sentence “a panic attack cannot harm you” sounds when it is spoken by someone who was sitting in a quiet room at the time. So this time I will not repeat the reassurance. Instead I will explain why the body is not in danger during an attack — organ by organ, not in a soothing tone, but by describing what actually happens to each one.

That difference matters to me. “Don’t worry” is advice. “Your blood pressure rises during an attack rather than falling, which is why you cannot faint” is information. The first evaporates in ten seconds; the second stays.

An attack is not a fault, it is a false alarm

A panic attack is a response to danger that fires when there is no danger. The system switching on is the same one that would save you if a car appeared in front of you on the road. All of its parts are working as they should. The only error is that they are on at the wrong time.

So a panic attack is not a sign that something is wrong with your body. It is a sign that the alarm system is over-sensitive — which is a nuisance, not a disease of the organs. I wrote in more detail about the structures driving that alarm in the post on anxiety in the brain.

An important consequence follows: the body is not broken, it is at full readiness. Readiness is exhausting, but it does no damage.

The heart: why a hundred and thirty is nothing

The commonest fear is that the heart will give out. So let us look at what really happens to it.

Adrenaline raises both the rate and the force of contraction. During an attack the pulse often jumps to between a hundred and twenty and a hundred and fifty. That is the same pulse as someone running up to the third floor, or a child playing in a yard. A healthy heart handles that range without difficulty — in exercise stress tests doctors deliberately drive it higher still, and that counts as a safe investigation.

The only difference is that when you run up stairs you expect the pounding and give it no meaning. In a shop you do not expect it, so you read it as a sign. The signal is the same; the interpretation is different.

Skipped or unusually strong single beats are common too. These are mostly extra beats that practically everyone has, and which you notice during arousal because your attention has turned inward.

The lungs: why you cannot suffocate

The feeling of running out of air is among the most convincing lies the body can tell. During an attack the airways are open, the diaphragm is working, and the oxygen in the blood is saturated practically to the top.

The sensation comes from elsewhere. Because you are breathing fast, you are washing carbon dioxide out of the blood — and it is carbon dioxide that triggers the urge to breathe in the brain. When there is too little of it, a confused message appears: the body has no need for a breath, while you feel the breath you took was not deep enough. That is why people during an attack yawn or drag air in hard, which only deepens it.

Worth holding on to: this sensation is not a measurement. It is the result of breathing too fast, not of a shortage of air.

One more thing settles people more than most explanations: breathing is not voluntary. Even if you very much wanted to stop breathing, you could not — the brainstem would force an inhalation before you could do anything worse. Which means control of your breathing cannot be “lost”. It can breathe badly, panickily, far too fast. It does not stop.

Why you almost certainly will not faint

During an attack people often grab a shelf or sit down on the floor, convinced they are about to fall. But fainting happens when blood pressure falls and the brain briefly receives too little blood.

During a panic attack the opposite happens: pressure rises. That is exactly why fainting during panic is rare. The unsteadiness is real, but it comes from narrowed cerebral vessels due to fast breathing and from tensed legs, not from an approaching collapse.

There is one exception and it is only fair to mention it: in fear of blood, needles or injury, some people show a different response in which pressure and pulse drop. There, fainting really does occur. In an “ordinary” panic attack it does not.

Why you will not go mad or lose control

The second commonest fear, right after the heart: that the attack will grow into something permanent. That you will start screaming in the street, that you will not come back to yourself, that this is the beginning of mental illness.

Panic and psychosis are different phenomena with different mechanisms; an attack does not develop into psychosis. The sense of unreality that often appears in panic is the result of narrowed attention and altered blood flow, not of thinking falling apart. And loss of control is practically absent: during attacks people do not smash things, they most often try to get outside as quietly as possible so that nobody notices. If anything, there is too much control.

How a heart attack is experienced differently

I am not writing this part as a guide to investigations, but as a description of the difference in experience.

Panic has a steep onset and a peak within minutes, then it declines. The pain is often sharp, pinpoint, on the left side of the chest, changeable, and often grows when you think about it. It comes with tingling, unreality and a strong fear of dying. It usually lasts under half an hour.

Cardiac pain is more often described as pressure, weight or squeezing in the middle of the chest, which can radiate to the arm, jaw or back, and which increases with exertion rather than with thought. It does not pass in ten minutes and is more often linked to walking uphill than to a supermarket.

These are patterns, not rules. Which is why the last word on this distinction is neither yours nor mine, but a doctor’s.

What a doctor should look at once

I recommend that anyone who gets attacks has a basic check-up once. Not because panic is suspicious, but so that the question is closed.

A doctor will most often look at thyroid function, a basic blood count, an electrocardiogram, and will ask about medication, coffee, energy drinks and supplements. Some conditions do produce a bodily picture that resembles panic — an overactive thyroid, anaemia, rhythm disturbances, occasionally inhaled medicines.

If everything is normal, that does not mean you invented your symptoms. On why normal results so often disappoint, I wrote in the post on bodily symptoms with no finding. And on when a doctor should come before therapy, I explained separately.

The loop that keeps the attack alive

The key reason panic persists is not in the body. It is in how a bodily sign gets interpreted.

You feel a stronger heartbeat. You read it as a sign that something bad is happening. Fear rises. Fear means more adrenaline, adrenaline means a stronger heartbeat — which confirms the first interpretation. The loop closes, and every turn tightens it. This model is forty years old and is still the best supported explanation for why attacks recur in people who are entirely healthy.

Why “it is not dangerous” does not help on its own

Now the part I rarely read in articles. Reassurance often does not work, and sometimes it does harm.

If someone tells you “it is not dangerous” and you feel relief, the loop has broken for now — but memory records that you had to ask someone. Next time you will ask again. That way reassurance slowly becomes a safety behaviour, much like carrying a tablet in your pocket or constantly checking your pulse. It helps in the short term, and in the long term it tells the body: the danger was real, you only avoided it this time.

So I am not offering this explanation as a sedative but as the ground for something else — for being able to get through the next attack without checking. That difference is well described in the post on what a symptom is for.

Where this claim does not hold

And now against myself, because it would be irresponsible to leave “panic is not dangerous” without an edge.

First: it does not hold equally for everyone. In someone with known significant heart disease, a serious arrhythmia or poorly controlled high blood pressure, a surge of adrenaline is not a trivial event. There the judgement belongs to a cardiologist, not to a blog.

Second: panic and heart disease do not exclude one another. Quite the opposite — people with panic disorder turn up in clinics with chest pain more often, and among them are some who also have a cardiac problem. A diagnosis of panic disorder is not protection against a heart attack. If the pattern of the pain changes, if it appears on exertion, if it lasts longer, it needs looking at again, no matter how many times it has been “only panic” before.

Third: there are rare conditions in which a strong emotional shock really does affect the heart — broken heart syndrome, for instance, which occurs under extreme strain and is well known to doctors. That is not what is happening in a panic attack in a queue at the till, but it is a reason not to write absolute sentences.

Fourth: “not dangerous” is not the same as “not important”. Chronically raised arousal over years, poor sleep, avoidance and withdrawal from life do have consequences — for health, and for how small a person’s world becomes. The harmlessness of a single attack is not a reason to leave the thing alone.

And fifth: for some people this knowledge does not help. They know everything I have written and panic anyway. That is not stupidity. The belief in danger lives in the fast part of the brain, which does not learn from explanations but from experience — from getting through an attack and having nothing happen. So the explanation prepares the ground; it does not do the work.

What actually makes the difference

In my experience things shift when a person stops measuring the attack and starts letting it be. When they check once rather than three times a week. When, during an attack, they do not leave immediately but stay one minute longer than last time.

It also helps to drop the small safety moves nobody usually notices: leaning on a shelf, sitting near the exit, quietly checking your pulse with fingers on your wrist. Each one is tiny, but together they tell the body every time that you avoided something real. Once they fall away, experience finally gets a chance to prove something.

Every such experience is, for the fast part of the brain, evidence that words cannot substitute for: it was awful and nothing happened. That is how the fear of fear slowly comes undone. On how to catch the interpretation that drives the loop, I wrote about catastrophising.

What to remember

A panic attack is a false alarm from a real system. At a hundred and thirty the heart is doing what it does on a staircase. There is too much oxygen, not too little. Blood pressure rises during an attack, so fainting almost never comes. The sense of unreality is not madness.

It is worth having a basic check-up once and closing the question. If the pattern changes later, open it again.

And most importantly: the fact that an attack is not dangerous does not mean it is not severe. Terrifying and dangerous are not the same thing. You experienced the first. Your body survived the second because there was none.