Does atrial fibrillation cause dizziness?

Atrial fibrillation makes the upper chambers of the heart beat in an uncoordinated way. The lower chambers may then beat irregularly, sometimes quickly, which can reduce how steadily blood is pumped. This may feel like lightheadedness, imbalance, weakness, or a sensation that you might faint. Some people also notice palpitations, tiredness, or breathlessness.

Dizziness has many possible causes, including dehydration, low blood pressure, inner-ear problems, low blood sugar, and medicine effects. A clinician may check your pulse, blood pressure, heart rhythm, and medicines rather than assuming one cause.

Sit or lie down promptly so you do not fall, and rise slowly once the feeling passes. Record when the dizziness began, how long it lasted, what you were doing, and whether your heartbeat felt irregular. Take heart medicines exactly as prescribed and do not stop an anticoagulant or rhythm medicine without medical advice. Arrange a review for repeated dizziness or a newly irregular pulse.

Call emergency services for dizziness with chest pain, severe breathlessness, one-sided weakness, trouble speaking, confusion, a severe headache, or fainting. Seek urgent assessment if dizziness is sudden, persistent, or occurs with a very fast or markedly irregular heartbeat. Do not drive while you feel faint or unsteady.

Could my dizziness be related to atrial fibrillation or its treatment? Do I need an ECG or an ambulatory rhythm monitor? How should I check my pulse? Which symptoms require emergency help, and should any medicine be adjusted?