Atrial fibrillation, also called afib or af, is an irregular heartbeat that can lead to stroke, blood clots, heart failure and other heart-related complications.

Atrial fibrillation (AFib) is an irregular heart rhythm that begins in your heart’s upper chambers (atria). Symptoms include fatigue, heart palpitations, trouble breathing and dizziness.

A fast, pounding heartbeat could be due to AFib, a type of heart rhythm disorder. Know the warning signs and when treatment is needed.

Afib stands for atrial fibrillation (AF), which is a type of arrhythmia, or abnormal heartbeat. Afib is caused by extremely fast and irregular beats from the upper chambers of the heart (usually …

Nov 30, 2022 · Atrial fibrillation, also known as A-fib or AF, is one of the most common types of arrhythmias (irregular heart rhythms). Atrial fibrillation causes your heart to beat irregularly and …

Find in-depth information on atrial fibrillation, including symptoms ranging from lack of energy to heart palpitations and dizziness.

What is atrial fibrillation? Atrial fibrillation (AFib) is a common heart rhythm disorder where the heart’s upper chambers, called the atria, beat irregularly and out of sync with the lower …

Sep 14, 2025 · Atrial fibrillation (AFib) causes different heart sensations, such as rapid beating and difficulty breathing. It’s not always serious. Learn when it could be.

May 15, 2024 · When a person has AFib, the normal beating in the upper chambers of the heart (the two atria) is irregular, and blood doesn't flow as well as it should from the atria to the lower …

What is AFib? Atrial fibrillation or AFib is an irregular heartbeat (arrhythmia) that can lead to blood clots, stroke and heart failure. In fact, with AFib, there’s a five times greater risk of suffering a …