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Atrial Fibrillation (AFib)
A common irregular and often fast heart rhythm. It can cause palpitations and, importantly, raises the risk of stroke from clots forming in the heart.
Causes & risk factors
- High blood pressure
- Coronary artery disease or heart failure
- Heart valve disease
- Overactive thyroid
- Excess alcohol or caffeine
- Ageing and diabetes
Common symptoms
- Palpitations or fluttering
- Breathlessness
- Tiredness
- Dizziness
- Chest discomfort
- Fainting (less common)
Tests & diagnosis
- ECG
- Holter / 24-hour monitor
- Thyroid function
- Echocardiogram
- Electrolytes
Treatment & management
- Blood thinners to lower stroke risk when needed
- Medicines to control heart rate or restore normal rhythm
- Cardioversion (a controlled electric shock) in selected cases
- Catheter ablation for suitable patients
- Treating triggers such as thyroid problems and alcohol
When to see a doctor urgently
- Call emergency services for palpitations with chest pain, severe breathlessness or fainting
- See a doctor promptly if you notice a new irregular or racing pulse
- Seek urgent care for sudden weakness, slurred speech or face droop (stroke signs)
Not a diagnosis. MedDroid gives general educational information about atrial fibrillation (afib). It cannot examine you, diagnose or prescribe — always confirm with a qualified doctor.
Frequently asked questions
Why does AFib cause strokes?
The irregular beat lets blood pool and clot in the heart; a clot can travel to the brain. Blood thinners lower this risk.
Is AFib dangerous?
It is usually manageable, but untreated it raises stroke and heart-failure risk, so it should be assessed.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.