Atrial fibrillation symptoms: when to see a provider

Noticing changes in your heartbeat

Feeling unusually tired, short of breath, or aware of an irregular heartbeat can be concerning. While these symptoms may have many causes, they can sometimes be signs of atrial fibrillation (AFib)—a common heart rhythm condition.¹

“AFib doesn’t always feel the same from person to person,” says Dr. Abrams, an Optum cardiologist. “Some people notice symptoms right away, while others may not realize anything is wrong.” 

What is atrial fibrillation? 

Atrial fibrillation is an irregular heart rhythm that occurs when the heart’s upper chambers beat irregularly and out of sync with the lower chambers. This can affect how blood moves through the heart and may increase the risk of complications such as stroke or heart failure over time if not properly managed.^1,3

Common atrial fibrillation symptoms 

AFib symptoms can vary and may come and go, which can make them easy to overlook. Some people may not notice any symptoms at all.^2,3

Symptoms may include: 

• A fluttering, racing, or irregular heartbeat 
• Fatigue or reduced energy 
• Shortness of breath 
• Dizziness or lightheadedness 
• Chest discomfort or pressure 
• Difficulty keeping up with usual activities 

Why AFib symptoms shouldn’t be ignored

Because AFib can interfere with normal blood flow through the heart, it may increase the risk of complications such as stroke or heart failure if left untreated. Early evaluation helps providers better understand what’s happening and determine whether monitoring or treatment may be appropriate.^1,3

“Symptoms that seem mild or inconsistent can still be meaningful,” Dr. Abrams explains. “Getting evaluated early gives us more options for managing heart health.” 

What happens during an AFib evaluation 

Evaluating AFib typically involves reviewing symptoms, medical history, and heart rhythm testing. Because AFib can be intermittent, monitoring over time may be part of the evaluation process.^1,4

An evaluation may include: 

• An electrocardiogram (EKG) to measure heart rhythm 
• Portable or wearable heart monitors used over time 
• Imaging tests to evaluate heart structure 
• Blood tests to look for contributing conditions 

How atrial fibrillation is treated 

Treatment for AFib is individualized and depends on symptoms, overall health, and personal risk factors. Care plans often focus on managing heart rhythm, help lower the risk of blood clots and stroke, and addressing underlying conditions such as high blood pressure.^1,4

“There is no one-size-fits-all approach to AFib care,” says Dr. Abrams. “Treatment decisions are tailored to each patient.” 

When to talk to a provider 

It’s important to talk with a provider if you notice heart rhythm symptoms that are ongoing, worsening, or concerning. While routine, populationwide screening for atrial fibrillation is not universally recommended, providers may consider evaluation based on your symptoms, age, and individual risk factors.⁵

If you experience symptoms, contact your doctor right away. Your provider can help determine whether you need an urgent or emergency evaluation, or what next steps to take. 

Call 911 immediately if you experience chest pain, a very fast or irregular heartbeat, lightheadedness or fainting, shortness of breath, or any signs of a stroke, such as sudden numbness or weakness, trouble speaking, or changes in vision.^1,2

Sources:

1. American Heart Association. What is atrial fibrillation (AFib or AF)? Last reviewed: March 24, 2023. Accessed: January 16, 2026. 

1. Centers for Disease Control and Prevention (CDC). About atrial fibrillation. Last updated: May 15, 2024. Accessed: January 16, 2026. 

1. National Heart, Lung, and Blood Institute (NHLBI). Atrial fibrillation. Last updated: November 30, 2022. Accessed: January 16, 2026. 

1. American Heart Association. Diagnosis and treatment of atrial fibrillation. Last reviewed: May 5, 2025. Accessed: January 16, 2026. 

1. U.S. Preventive Services Task Force (USPSTF). Atrial fibrillation: Screening. Published: January 25, 2022. Accessed: January 16, 2026