The commonest sustained heart rhythm problem, and often silent. Finding it matters because of stroke, not symptoms.
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Atrial fibrillation is an irregular and often fast heart rhythm. Instead of the top chambers of the heart contracting in a coordinated way, they quiver — so the pulse becomes irregular, and blood moves less efficiently through the heart.
It is the commonest sustained rhythm disturbance in the UK, affecting more than a million people, and a substantial proportion of them do not know they have it.
The reason AF matters is not usually how it feels. It is that blood pooling in a quivering atrium can form a clot, and that clot can travel to the brain. Untreated AF raises the risk of stroke roughly five-fold, and AF-related strokes tend to be more severe and more disabling than others.
That is the whole argument for finding it. Someone with no symptoms at all still carries the stroke risk — which is why a pulse check is one of the highest-value thirty seconds in medicine.
Roughly a third of people with AF have no symptoms whatsoever. It is found on a routine pulse check, a blood pressure reading, a pre-operative ECG, or a smartwatch alert — and increasingly the last of those.
The absence of symptoms does not reduce the stroke risk. That is the single most important thing to understand about this condition, and it is why silent AF is worth finding.
Atrial fibrillation is diagnosed on an electrocardiogram showing an irregularly irregular rhythm with no distinct P waves. A description of symptoms, however clear, is not a diagnosis.
Paroxysmal AF — the kind that starts and stops — is easy to miss, because a standard ECG only captures the moment you are attached to it. Where symptoms are intermittent, longer monitoring is used: a 24-hour or 7-day tape, or a patch worn for a fortnight.
This is the commonest reason someone is told "your heart is fine" when it is not. A normal ECG on a good day excludes nothing if the palpitations happen twice a month.
Consumer devices detect AF reasonably well and are genuinely finding cases that would otherwise have been missed. They are a prompt, not a diagnosis — a positive reading needs confirming on a medical ECG, and false alarms are common.
Do bring the trace. Most devices export a single-lead recording, and it is far more useful than the notification alone.
Feel your own pulse for thirty seconds. A regular pulse makes AF unlikely at that moment; an irregularly irregular one is worth acting on. It costs nothing and it is how a great deal of AF is first suspected.
Thyroid function, full blood count, kidney function and electrolytes, and usually an echocardiogram to look at heart structure and valves. Thyroid is the one not to skip — treating an overactive thyroid can resolve the AF entirely.
We cannot diagnose atrial fibrillation remotely, and it would be wrong to suggest otherwise. AF is confirmed on an ECG, which requires equipment and a person in the room.
We do not start or manage anticoagulation remotely on a first consultation, and we do not diagnose AF from a description. Both need an ECG and, usually, cardiology input.
Call 999 immediately if you have:
Seek same-day assessment for:
Book a routine consultation for: occasional palpitations without other symptoms, a smartwatch notification you want interpreted, or a discussion about anticoagulation you have already been offered.
Take it consistently. Missing doses is where the risk lives. Do not stop it because you feel well, and do not stop it before a dental appointment or procedure without asking — stopping unnecessarily causes strokes.
Everything that matters most in AF, and we would rather say so plainly.
If you suspect AF, your NHS GP is the right first call. An ECG is a ten-minute appointment and it settles the question.
What paying does not buy is a diagnosis — that still needs an ECG somewhere with the equipment.
This page follows NICE NG196, Atrial fibrillation: diagnosis and management, and the stroke prevention framework it sets out.
The UK National Screening Committee does not currently recommend a national AF screening programme, on the grounds that the evidence for population screening is not yet sufficient. Opportunistic pulse checks during other appointments remain standard practice and are where most silent AF is found.
Reviewed against NICE NG196 and UK NSC recommendations current at the date shown above.
Yes, and this is the whole point. Around a third of people with AF feel nothing at all, and the stroke risk is the same.
Treating AF is mostly about preventing a stroke, not about how the rhythm feels.
Get it confirmed on a medical ECG. Consumer devices detect AF reasonably well but also produce false positives.
Export the trace and bring it — the recording is far more useful than the alert.
No. Aspirin is no longer recommended for stroke prevention in AF — it gives you much of the bleeding risk and very little of the protection.
This advice changed years ago and still circulates. If you are on aspirin for AF alone, that is worth reviewing.
Usually not. The decision is based on your stroke risk score, not on whether you are in AF at any given moment.
People with paroxysmal AF carry a similar stroke risk to those in it permanently, which surprises almost everyone.
Probably not, though it may help if it clearly triggers you. The population evidence linking caffeine to AF is weaker than its reputation.
Alcohol is the lever with real evidence behind it, and it is the one most people would rather not hear about.
The rhythm is rarely dangerous. The clot risk is. Most people live normally with well-managed AF.
Poorly controlled fast AF over months can weaken the heart, which is why rate control matters too.
It genuinely could, and it is worth checking in everyone with new AF. An overactive thyroid is a recognised and fully reversible cause.
It is a cheap blood test and it is missed often enough to be worth asking for by name.
Sometimes. Cardioversion restores normal rhythm, and ablation can prevent recurrence in selected people, with good results in younger patients with paroxysmal AF.
Neither automatically ends anticoagulation — that decision stays with your risk score.
Usually not, and stopping unnecessarily is a genuine cause of avoidable stroke.
Always ask rather than assume. Most dental procedures are safely done on anticoagulation.
August 30, 2026
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