Atrial fibrillation, or AFib, is the most common serious heart-rhythm disorder in the United States, and a leading contributor to stroke. Yet many people who have it feel nothing at all.
Those who do feel something often blame the wrong thing. Palpitations, unexplained fatigue and breathlessness get chalked up to anxiety, poor sleep or a stressful stretch of work.
Harvard Health notes that at least a quarter of people with AFib feel no symptoms, a condition sometimes called silent AFib. Other reviews put the share of asymptomatic patients closer to one-third. About 1 in 11 people aged 65 and older have AFib, per Harvard.
The stakes are real. A large US analysis found that AFib is the underlying cause for about 15 percent of all strokes in the United States, and 36 percent of strokes in people over 80.
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Signs that are easy to write off
The signals below are drawn from AFib patient guidance published by Harvard Health, Endeavor Health cardiologists and other clinical reviews. None of them proves AFib on its own, but repeated episodes are worth a conversation with a doctor.
1. Palpitations that come and go. Harvard calls a racing, irregular heartbeat the hallmark sign of AFib, and notes that it usually comes and goes rather than staying constant. Patients often describe a fluttering or pounding in the chest.
2. A fluttering or flip-flop feeling. Cardiologist Jose Nazari describes AFib palpitations as feeling like your heart is fluttering or racing, or a flip-flop sensation. It can be brief and easy to dismiss.
3. Unexplained fatigue or weakness. Fatigue is one of the most common AFib symptoms, according to a clinical overview of silent and symptomatic AFib. It can linger for days rather than lift with a good night of sleep.
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4. Shortness of breath. Harvard lists breathlessness among the classic warning signs, and notes that fluid can build up in the lungs when the heart isn't pumping efficiently, making even light activity feel harder.
5. Lightheadedness or dizziness. New lightheadedness or dizziness at rest or on exertion can point to AFib, per the Endeavor Health guidance from Dr. Nazari.
6. Chest pain, pressure or discomfort. The same guidance flags chest pain, pressure or discomfort at rest or with exertion as a red flag. Chest pain also warrants an immediate call to emergency services, since it can signal a heart attack.
7. A sudden urge to urinate. Harvard specifically lists an urge to urinate among AFib symptoms. Researchers link it to hormones released when the atria are stretched during an episode.
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8. Fainting or near-fainting. Fainting is on Harvard's list of AFib symptoms and often prompts the first medical work-up that uncovers the arrhythmia.
Why so many cases go unnoticed
Part of the problem is timing. Bouts of AFib are often short-lived and sometimes symptomless, so diagnosing it can be challenging, Harvard notes. And clinicians still don't fully understand why some people feel every skipped beat while others feel nothing.
The other trap is attribution. Palpitations, breathlessness and unexplained tiredness look identical to a rough patch of stress or a poor sleep week.
Endeavor Health notes that some people with AFib have no symptoms at all. The condition is often picked up only during a routine exam or a test done for another reason.
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Because AFib raises stroke risk, catching it early matters. If you notice any of these signs repeatedly, especially palpitations combined with breathlessness or unexplained fatigue, talk to your doctor. Chest pain or severe shortness of breath is not a wait-and-see symptom. Call 911.
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This article is made and published by Jesper Bengtson, who may have used AI in the preparation.