Atrial Fibrillation: Common Questions
An irregular and often fast heart rhythm caused by disorganised electrical activity in the atria.
Last revised
Atrial Fibrillation: the questions people actually ask, answered from published guidance.
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 get help" below apply to you.
What is Atrial Fibrillation?
An irregular and often fast heart rhythm caused by disorganised electrical activity in the atria.
Why does it matter?
It substantially raises stroke risk, and that risk is largely preventable with anticoagulation once it is found.
Common symptoms for Atrial Fibrillation?
Palpitations, breathlessness, fatigue, dizziness.
Main complication for Atrial Fibrillation?
Stroke.
What is the single most useful thing to do?
Learn to check your own pulse for regularity.
What is the most common mistake?
Assuming an irregular pulse without symptoms does not matter.
When should I see 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 to go next
- Atrial Fibrillation: Just the Figures
- Atrial Fibrillation: What the Evidence Actually Says
- Atrial Fibrillation — the reference entry
- Heart Attack Symptoms: What the Evidence Actually Says
- The Evidence on Heart Failure, Without the Hype
When to get help
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.
