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How atrial fibrillation feels varies from person to person. Some patients notice palpitations and irregular heartbeats and are immediately aware when atrial fibrillation starts. Others feel chest discomfort, shortness of breath, lightheadness, dizziness or a general tiredness, without having palpitations. In some individuals symptoms of atrial fibrillation can be present at rest, while in others they appear during exercise.
The onset of an episode of atrial fibrillation is not always clear. In some cases symptoms start abruptly while in others there is a reduction in the ability to exercise. In the latter case one may not suspect atrial fibrillation and it can take a long time before the patient seeks medical attention.
Finally, it is possible that someone with atrial fibrillation has no symptoms at all and the arrhythmia is discovered accidentally, for instance during a routine check-up or using wearables.
The reason why some people with atrial fibrillation experience symptoms, while others do not, is unclear. In many patients the symptoms are related to a faster heartbeat. However some patients have symptoms, even if the heart rate is not fast. In other cases the heart beats too slowly during atrial fibrillation which can also cause symptoms.
Atrial fibrillation episodes may disappear without treatment, nevertheless you should discuss what to do if an episode occurs with your physician. If you experience any unpleasant symptoms which make you feel really unwell (like nausea, chest pain, fainting etc.), you should seek immediate medical attention at a hospital.
FREQUENTLY ASKED QUESTIONS
What does an AFib episode feel like?
An AFib episode can feel like heart palpitations, a fluttering sensation in the chest, or an irregular and rapid heartbeat. You may also experience dizziness, fatigue, chest discomfort, or shortness of breath.
Can AFib cause nausea or vomiting?
Yes, alhtough rare, AFib can cause nausea or vomiting due to reduced blood flow and oxygen levels, which may affect the digestive system.
Can AFib cause dizziness or lightheadedness?
Yes, dizziness or lightheadedness is common during AFib episodes because the irregular heart rhythm can reduce blood flow to the brain.
Is it possible to have AFib without any symptoms?
Yes, many people with AFib may not experience symptoms. This is called “silent AFib” and is often discovered during routine check-ups or when complications arise.
What should I do during an AFib episode?
If you are symptomatic sit or lie down, stay calm, and focus on slow breathing. If the episode persists, or you experience severe symptoms like chest pain, seek medical attention immediately.
Can AFib episodes occur at night?
Yes, AFib can be triggered at night due to factors like sleep apnea, or changes in heart rate caused by the so called autonomous nervous system. Adjusting sleep position or using CPAP therapy for sleep apnea may help.
