Atrial Fibrillation: What the Evidence Actually Says
It substantially raises stroke risk, and that risk is largely preventable with anticoagulation once it is found.
Key takeaways
- Common symptoms: palpitations, breathlessness, fatigue, dizziness
- Often: causes no symptoms at all
- Most useful single change: Learn to check your own pulse for regularity.
- Commonest mistake: Assuming an irregular pulse without symptoms does not matter.
- See a doctor if any of the signs under "When to speak to a doctor" below apply to you.
What it is
An irregular and often fast heart rhythm caused by disorganised electrical activity in the atria. It sits within Heart Health. The figures come from the bodies named at the foot of this page.
The numbers, in one place
| Measure | Figure |
|---|---|
| Common symptoms | palpitations, breathlessness, fatigue, dizziness |
| Often | causes no symptoms at all |
| Main complication | stroke |
| Detection | pulse check, then an ECG |
| Treatment | rate or rhythm control, plus anticoagulation where risk warrants it |
What helps
These are the changes with the clearest evidence behind them. Start wherever it is easiest to start.
- Learn to check your own pulse for regularity
- Ask for a pulse check at routine appointments over 65
- Take anticoagulation exactly as prescribed if it is offered
- Reduce alcohol, which is a recognised trigger
What to avoid
What to steer clear of, and why it catches people out.
- Assuming an irregular pulse without symptoms does not matter
- Stopping anticoagulation without advice
- Ignoring palpitations that are new or persistent
Where to go next
- Atrial Fibrillation: The Practical To-Do List
- Popular Beliefs About Atrial Fibrillation, and What Is Actually Published
- Atrial Fibrillation — the reference entry
- Heart Attack Symptoms: What the Evidence Actually Says
- The Evidence on Heart Failure, Without the Hype
When to speak to a doctor
Call 999 for sudden weakness or numbness on one side, facial drooping, difficulty speaking, chest pain, or fainting. See a GP promptly for a new irregular pulse, palpitations that persist, or unexplained breathlessness. Anticoagulants raise bleeding risk: seek urgent help for a head injury, blood in urine or stool, or bleeding that will not stop.
Where this comes from
- NICE — Atrial fibrillation: diagnosis and management
- British Heart Foundation — atrial fibrillation
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
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