How common is shortness of breath in atrial fibrillation?

Atrial fibrillation is an irregular heart rhythm. When the rhythm is fast or uneven, the heart may pump less efficiently and ordinary activity can feel more demanding. People may notice breathlessness while walking, fatigue, chest discomfort, light-headedness or palpitations; others have few noticeable symptoms. Shortness of breath can have many causes, so it cannot by itself confirm an abnormal heart rhythm. An electrocardiogram is commonly used to check the rhythm.

Pause the activity, sit down and note when the symptoms began. If you have a known diagnosis, take regular medicines as prescribed and follow any instructions your cardiac team has given you about a rapid pulse. Avoid trying to push through marked breathlessness. A symptom diary can record the pulse sensation, trigger, duration and associated symptoms for a medical review.

Call emergency services for severe or sudden breathlessness, chest pain or pressure, fainting, new weakness on one side, facial drooping, speech difficulty, or confusion. Seek urgent medical advice if palpitations and breathlessness are new, persistent or clearly worsening, even without those emergency signs.

Ask what heart-rate or rhythm symptoms should prompt urgent contact, whether you should monitor your pulse, and how your medicines may affect exercise. Discuss any breathlessness that is limiting your usual routine or changing over time.