10 Known AFib Symptoms

2. Heart Palpitations

Heart palpitations are one of the most common symptoms of atrial fibrillation. You may feel your heart racing, fluttering, skipping beats, or pounding in your chest, throat, or neck. These sensations can last for a few minutes and may come and go without warning.

In atrial fibrillation, the upper chambers of the heart beat irregularly. This uneven rhythm makes your heartbeat feel faster or more erratic than normal. Some people notice palpitations more often when lying down, after drinking caffeine or alcohol, or during periods of stress. Palpitations may also reflect changes in how blood moves through the heart.

When the heart does not pump effectively during an irregular rhythm, blood can pool inside the chambers. You might also notice other symptoms at the same time, such as lightheadedness, shortness of breath, or tiredness. If palpitations become frequent or occur with chest pain, it’s important to seek medical evaluation.

3. Heart Disease

Heart disease includes a group of conditions that affect how your heart works. It can involve problems with your heart’s rhythm, valves, muscles, or blood vessels. Atrial fibrillation (AFib) is one type of heart disease that causes an irregular heartbeat.

When heart disease develops, the heart may not pump blood efficiently. This reduced function can lead to fatigue, dizziness, shortness of breath, or chest discomfort. Some people notice symptoms early, while others may not feel changes until the condition becomes more serious.

You may have a higher risk of heart disease if you smoke, have high blood pressure, diabetes, or carry excess weight. As you get older, if heart issues run in your family, or if you have other health problems, your chances of having heart trouble go up too.

This condition can increase the risk of stroke and other heart-related complications. Managing AFib often involves lifestyle changes and medication to help maintain a normal heart rhythm and reduce associated risks..

4. High Blood Pressure

High blood pressure, also called hypertension, is a common condition that increases your risk of atrial fibrillation. When blood pushes too strongly against the walls of your arteries for a long time, your heart has to work harder to move blood through your body. Over time, this extra strain can cause the heart’s upper chambers to stretch or thicken.

These structural changes can interfere with the electrical signals that control your heartbeat, increasing the chance of an irregular rhythm. High blood pressure usually develops slowly, so you may not notice symptoms at first. Some people only learn about it during routine checkups.

When symptoms do appear, they may include headaches, shortness of breath, or a feeling of pressure in the chest. Keeping your blood pressure in a healthy range lowers your chance of developing AFib. Steps like eating less salt, staying regularly active, limiting alcohol, and avoiding tobacco can help reduce risk of complications.

5. Angina or Chest Pain

Chest pain can occur when your heart does not receive enough oxygen-rich blood, a discomfort known as angina. It may feel like pressure, squeezing, or fullness in the chest, and the sensation can sometimes spread to the arms, neck, jaw, back, or stomach.

In atrial fibrillation (AFib), an irregular heartbeat can reduce blood flow and strain the heart, which may lead to chest discomfort or angina. Not everyone with AFib has chest pain, but it is important to take notice when it occurs. Angina often appears during physical activity, stress, or after a heavy meal.

Some people describe it as a tight or heavy sensation, while others compare it to discomfort similar to indigestion. Angina may feel like a heart attack, but it typically improves after a few minutes of rest, unlike a heart attack. If chest pain lasts more than a few minutes, you should treat it as an emergency.

6. Lung Disease-Like Symptoms

When you have atrial fibrillation, you might feel short of breath, especially when lying down or during light activity. This can resemble the kind of breathing trouble people often associate with lung problems. The irregular heartbeat makes it harder for your heart to pump blood effectively, which can cause fluid to build up in your lungs.

You might also notice a dry cough or chest tightness. These sensations are easy to mistake for respiratory conditions like asthma or bronchitis. Because the heart and lungs work closely together, strain on the heart can quickly affect how comfortably you breathe. Some people feel tired after simple tasks because their body is not getting enough oxygen.

You may think this tiredness or loss of stamina is from a lung condition, but it can be a sign that your heart is working overtime to keep up with irregular beats. This constant strain on your heart can lead to further complications if left unaddressed.

7. Weight Loss and Diarrhea

You might notice weight loss or frequent diarrhea if your body is under stress from atrial fibrillation. When your heart beats irregularly, it can make your body work harder than usual. This can cause fatigue, poor appetite, and changes in how your body uses energy. Some people start losing weight without trying because they eat less or burn more energy while their heart rhythm stays unstable.

Diarrhea can also occur if you take certain heart medications, as some drugs affect digestion or nutrient absorption. In other cases, stress or anxiety related to AFib may contribute to changes in bowel habits. Because diarrhea can lead to dehydration, it may also worsen symptoms linked to an irregular heartbeat.

If these signs appear, monitor how much you eat and drink and note any sudden changes in your weight. Additionally, the combination of these factors can lead to a feeling of weakness or malaise, further exacerbating the difficulty of managing daily activities.

8. Asymptomatic Cases

You can have atrial fibrillation without noticing any symptoms. This is called an asymptomatic or “silent” case. Many people only discover they have it during a routine checkup or when an irregular pulse is detected, allowing the condition to go unnoticed for months or even years.

Even without symptoms, the heart rhythm remains irregular. The upper chambers beat unevenly, which can cause blood to pool and increase the risk of clots that may lead to a stroke or other complications. Silent AFib is often identified through tests done for other health reasons. An electrocardiogram (ECG), a wearable heart monitor, or routine blood pressure checks may reveal the irregular rhythm.

People with silent AFib may not feel the fluttering or skipped beats others experience. Instead, they might notice subtle signs such as mild fatigue or slight shortness of breath that are easy to overlook. If an irregular rhythm is suspected, further monitoring or preventive evaluation may be recommended.

9. Sudden-Onset Shortness of Breath

You might notice breathing becoming difficult all of a sudden, whether you are resting, walking, or doing light activity. The sensation can come on quickly and make it feel as though you cannot get enough air. Shortness of breath linked to atrial fibrillation occurs because the heart is not pumping blood efficiently.

An irregular rhythm moves blood unevenly through the heart chambers, reducing oxygen flow to the body. When this happens, the lungs may work harder to deliver oxygen, which creates the feeling of breathlessness. If you experience this sudden symptom without a clear reason, such as exercise or illness, it may signal that your heart rhythm is out of balance.

The shortness of breath may last only moments or continue longer, depending on how irregular the heartbeat is at the time. Some people also feel chest pressure or lightheadedness during these episodes, and taking deep breaths may be difficult.

10. Lower Extremity Swelling

You might notice swelling in your feet, ankles, or legs if you have atrial fibrillation. When the heart cannot pump blood efficiently, slower circulation causes fluid to collect in the lower parts of your body because gravity pulls it downward.

The swelling may start mild, making your shoes feel tight by the end of the day. Over time, it can become more obvious and uncomfortable. You may also see dents on your skin after pressing the swollen area, which indicates fluid buildup under the skin. In some cases, lower extremity swelling occurs along with shortness of breath or fatigue. These signs show your heart isn’t moving blood effectively through your body.

Elevating your legs when sitting or lying down can help fluid move back toward the upper body. Many factors can cause lower leg swelling, not just atrial fibrillation. Do not ignore swelling, as it may reflect strain on your heart or circulatory system.