Atrial Fibrillation (AFib): Symptoms, Causes, and Treatment

Atrial fibrillation (AFib) is the most common type of sustained arrhythmia, affecting millions globally. Atrial fibrillation significantly increases the risk of stroke, often leading to severe disability or even death if left untreated. Understanding the relationship between atrial fibrillation and stroke is essential for early detection, prevention, and effective long-term care.
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Key Takeaways
<ul>
<li style="font-weight: 400;" aria-level="1">Atrial fibrillation is a common irregular heart rhythm that can lead to poor blood flow and significantly increase the risk of stroke and other complications.</li>
<li style="font-weight: 400;" aria-level="1">Atrial fibrillation symptoms range from palpitations and fatigue to no symptoms at all, making regular check-ups crucial for early detection.</li>
<li style="font-weight: 400;" aria-level="1">Atrial fibrillation can be caused by heart conditions like hypertension or valve disease, as well as non-cardiac factors such as thyroid disorders, sleep apnea, and alcohol use.</li>
<li style="font-weight: 400;" aria-level="1">If untreated, Atrial fibrillation can lead to stroke, heart failure, cognitive decline, and blood clots in various parts of the body.</li>
</ul>
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Table of Contents
<ul>
<li>What is Atrial Fibrillation (AFib)?</li>
<li>Symptoms of Atrial Fibrillation</li>
<li>Causes of Atrial Fibrillation
<ul>
<li>Heart Conditions</li>
<li>Non-Heart Conditions</li>
</ul>
</li>
<li>Atrial Fibrillation Complications</li>
<li>How to Diagnose Atrial Fibrillation?</li>
<li>Treatment for Atrial Fibrillation</li>
<li>Atrial Fibrillation at Phyathai Hospital</li>
</ul>
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<h2>What is Atrial Fibrillation (AFib)?</h2>
Atrial fibrillation (AFib) is a common type of irregular heart rhythm, or arrhythmia, in which the upper chambers of the heart (the atria) beat rapidly and out of sync with the lower chambers (the ventricles). This disruption in normal heart rhythm can cause poor blood flow and increases the risk of blood clots forming in the heart. 
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If a clot travels to the brain, it can lead to a stroke. Atrial fibrillation (AFib) may cause symptoms such as palpitations, fatigue, shortness of breath, or it may occur without any noticeable symptoms. It can be occasional or chronic and often requires medical treatment to control the heart rate, restore normal rhythm, and prevent complications like stroke.
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<h2>Symptoms of Atrial Fibrillation</h2>
<img loading="lazy" decoding="async" class="alignleft size-full wp-image-442868" src="https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/symptoms-of-atrial-fibrillation-2.jpg" alt="" width="1200" height="630" srcset="https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/symptoms-of-atrial-fibrillation-2.jpg 1200w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/symptoms-of-atrial-fibrillation-2-640x336.jpg 640w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/symptoms-of-atrial-fibrillation-2-768x403.jpg 768w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/symptoms-of-atrial-fibrillation-2-600x315.jpg 600w" sizes="auto, (max-width: 1200px) 100vw, 1200px" />
Atrial fibrillation symptoms can vary widely from person to person. Some individuals may have noticeable signs, while others may have no symptoms at all. Common atrial fibrillation symptoms include:
<ul>
<li style="font-weight: 400;" aria-level="1">Rapid or irregular heartbeat (palpitations)</li>
<li style="font-weight: 400;" aria-level="1">Fatigue</li>
<li style="font-weight: 400;" aria-level="1">Dizziness</li>
<li style="font-weight: 400;" aria-level="1">Shortness of breath</li>
<li style="font-weight: 400;" aria-level="1">Chest pain</li>
<li style="font-weight: 400;" aria-level="1">Weakness</li>
<li style="font-weight: 400;" aria-level="1">Fluttering sensation in the chest</li>
<li style="font-weight: 400;" aria-level="1">Becoming easily tired during physical activity</li>
</ul>
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In some cases, Atrial fibrillation (AFib) is only detected during a routine check-up or after complications such as a stroke. Because symptoms can be subtle or completely absent, early detection through regular monitoring is essential—especially for individuals with known risk factors.
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<h2>Causes of Atrial Fibrillation</h2>
There are several factors that can lead to the development of atrial fibrillation. An atrial fibrillation cause may be related to underlying heart conditions or other medical issues that affect the heart&#8217;s electrical system. Common causes include:
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<h3>Heart Conditions </h3>
<ul>
<li style="font-weight: 400;" aria-level="1">High blood pressure (hypertension) : one of the most common risk factors</li>
<li style="font-weight: 400;" aria-level="1">Coronary artery disease : reduced blood flow to the heart muscle</li>
<li style="font-weight: 400;" aria-level="1">Heart valve disorders : especially involving the mitral valve</li>
<li style="font-weight: 400;" aria-level="1">Heart failure : weak or damaged heart muscle can disrupt normal rhythm</li>
<li style="font-weight: 400;" aria-level="1">Congenital heart defects : structural problems present at birth</li>
<li style="font-weight: 400;" aria-level="1">Previous heart surgery : scar tissue can interfere with electrical signals</li>
<li style="font-weight: 400;" aria-level="1">Age-related changes : risk increases significantly with age</li>
</ul>
&nbsp;
<h3>Non-Heart Conditions </h3>
<ul>
<li style="font-weight: 400;" aria-level="1">Thyroid disorders : particularly hyperthyroidism (overactive thyroid)</li>
<li style="font-weight: 400;" aria-level="1">Sleep apnea : disrupted breathing during sleep can stress the heart</li>
<li style="font-weight: 400;" aria-level="1">Heavy alcohol use : especially binge drinking (&#8220;holiday heart syndrome&#8221;)</li>
<li style="font-weight: 400;" aria-level="1">Stimulant use : including caffeine, nicotine, and certain medications</li>
<li style="font-weight: 400;" aria-level="1">Lung diseases : such as chronic obstructive pulmonary disease (COPD)</li>
<li style="font-weight: 400;" aria-level="1">Severe infections or inflammation : affecting the heart or body</li>
</ul>
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<h2>Atrial Fibrillation Complications</h2>
Atrial fibrillation (AFib) can lead to several serious health complications if not properly managed. These complications often result from the heart&#8217;s inability to pump blood effectively due to the irregular rhythm. Common atrial fibrillation complications include:
<ul>
<li aria-level="1">Stroke</li>
</ul>
Atrial fibrillation increases the risk of stroke by 4-5 times. The irregular heartbeat can cause blood to pool in the atria, forming clots that may travel to the brain and block blood flow.
<ul>
<li aria-level="1">Heart failure</li>
</ul>
Prolonged atrial fibrillation can weaken the heart muscle, making it less effective at pumping blood, which may eventually lead to heart failure.
<ul>
<li aria-level="1">Chronic fatigue</li>
</ul>
Poor circulation and reduced oxygen delivery to the body can cause persistent tiredness and reduced physical stamina.
<ul>
<li aria-level="1">Cognitive decline and dementia</li>
</ul>
Reduced blood flow to the brain over time, as well as stroke risk, may contribute to memory problems or dementia.
<ul>
<li aria-level="1">Other heart rhythm problems</li>
</ul>
Atrial fibrillation may lead to other arrhythmias or worsen existing heart rhythm disorders.
<ul>
<li aria-level="1">Blood clots in other parts of the body</li>
</ul>
In addition to the brain, clots can also travel to the lungs (causing pulmonary embolism), kidneys, or limbs.
&nbsp;
<h2>How to Diagnose Atrial Fibrillation?</h2>
<img loading="lazy" decoding="async" class="alignleft size-full wp-image-442869" src="https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/how-to-diagnose-atrial-fibrillation-2.jpg" alt="" width="1200" height="630" srcset="https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/how-to-diagnose-atrial-fibrillation-2.jpg 1200w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/how-to-diagnose-atrial-fibrillation-2-640x336.jpg 640w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/how-to-diagnose-atrial-fibrillation-2-768x403.jpg 768w, https://pyt-storage.sgp1.cdn.digitaloceanspaces.com/wp-content/uploads/2025/08/how-to-diagnose-atrial-fibrillation-2-600x315.jpg 600w" sizes="auto, (max-width: 1200px) 100vw, 1200px" />
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Diagnosing atrial fibrillation (AFib) involves a combination of medical history review, physical examination, and specialized cardiac tests. Because atrial fibrillation can be occasional or asymptomatic, accurate detection is essential for preventing complications such as stroke. Here are the key diagnostic methods:
<ul>
<li aria-level="1">Medical History &amp; Physical Exam</li>
</ul>
The doctor will ask about symptoms such as palpitations, fatigue, or dizziness, as well as any underlying conditions or family history. A physical exam may reveal an irregular pulse or abnormal heart sounds.
<ul>
<li aria-level="1">Electrocardiogram (ECG or EKG)</li>
</ul>
Atrial fibrillation is highly relevant to an ECG or EKG. A standard ECG (also called EKG) is the most commonly used test to diagnose atrial fibrillation, a common heart rhythm disorder. It records the heart’s electrical signals and helps detect the irregular rhythm characteristic of atrial fibrillation.
<ul>
<li aria-level="1">Holter Monitor</li>
</ul>
A portable ECG device worn continuously for 24-48 hours. It is useful for detecting intermittent episodes of AFib that may not appear during a brief ECG.
<ul>
<li aria-level="1">Event Monitor or Mobile Cardiac Telemetry</li>
</ul>
Used for longer-term monitoring, usually over several days or weeks. Patients activate the device when they feel symptoms, allowing physicians to correlate episodes with heart rhythm data.
<ul>
<li aria-level="1">Echocardiogram</li>
</ul>
An ultrasound of the heart that shows its size, structure, and function. It helps detect potential causes of atrial fibrillation, such as valve disease or heart enlargement.
<ul>
<li aria-level="1">Blood Tests</li>
</ul>
Used to identify potential triggers or related conditions, such as thyroid dysfunction or electrolyte imbalances.
<ul>
<li aria-level="1">Stress Test</li>
</ul>
Helps assess whether exercise triggers atrial fibrillation or if underlying coronary artery disease is contributing to the arrhythmia.
<ul>
<li aria-level="1">Electrophysiology Study (EPS)</li>
</ul>
In selected cases, this invasive test maps the heart’s electrical system to precisely identify abnormal pathways causing atrial fibrillation.
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<h2>Treatment for Atrial Fibrillation</h2>
The goal of atrial fibrillation treatment is to restore a normal heart rhythm, control the heart rate, prevent blood clots, and reduce the risk of stroke or heart failure. The specific treatment plan depends on the type of atrial fibrillation, the severity of symptoms, and any underlying health conditions. Common treatment options include:
<ul>
<li aria-level="1">Medications</li>
<li style="list-style-type: none;">
<ul>
<li style="list-style-type: none;">
<ul>
<li style="font-weight: 400;" aria-level="2">Rate control medications (e.g., beta-blockers, calcium channel blockers) help slow the heart rate.</li>
<li style="font-weight: 400;" aria-level="2">Rhythm control medications (antiarrhythmics) help restore and maintain a normal heart rhythm.</li>
<li style="font-weight: 400;" aria-level="2">Blood thinners (anticoagulants) reduce the risk of stroke by preventing blood clots. Examples include warfarin, apixaban, rivaroxaban, and dabigatran.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li aria-level="1">Cardioversion</li>
</ul>
A procedure that uses electrical shocks (electrical cardioversion) or medication (pharmacologic cardioversion) to reset the heart to a normal rhythm.
<ul>
<li aria-level="1">Catheter Ablation</li>
</ul>
A minimally invasive procedure in which heat or cold energy is used to destroy small areas of heart tissue causing the irregular rhythm. This is an effective atrial fibrillation treatment for certain patients, especially when medications are not successful.
<ul>
<li aria-level="1">Surgical Options</li>
</ul>
In some cases, surgical ablation or the Maze procedure may be recommended during open-heart surgery or as a stand-alone treatment.
<ul>
<li aria-level="1">Lifestyle Changes</li>
</ul>
<ul>
<li style="list-style-type: none;">
<ul>
<li style="font-weight: 400;" aria-level="2">Managing underlying conditions such as high blood pressure, sleep apnea, and diabetes.</li>
<li style="font-weight: 400;" aria-level="2">Reducing alcohol intake, quitting smoking, and avoiding stimulants.</li>
<li style="font-weight: 400;" aria-level="2">Maintaining a healthy weight and staying physically active.</li>
</ul>
</li>
</ul>
&nbsp;
<h2>Atrial Fibrillation at Phyathai Hospital</h2>
Atrial fibrillation (AFib) is the most common type of heart rhythm disorder, especially among older adults. It occurs when the upper chambers of the heart (atria) beat irregularly and rapidly, leading to poor blood flow. This condition significantly increases the risk of blood clots, stroke, heart failure, and other complications if left untreated.
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If you suspect you may have atrial fibrillation, or if you’ve already been diagnosed, it is important to seek expert medical care as soon as possible. Phyathai Hospital offers comprehensive care for patients with atrial fibrillation through a multidisciplinary team of experienced cardiologists, advanced diagnostic tools, and personalized treatment plans. Whether you need medication management, ablation therapy, or long-term monitoring, Phyathai Hospital is fully equipped to provide safe and effective care to help you live a healthier, more active life.
<ul>
<li style="font-weight: 400;" aria-level="1">Call Center 1772 (press 9 for ENG)</li>
<li style="font-weight: 400;" aria-level="1">Email: webcenter@phyathai.com</li>
<li style="font-weight: 400;" aria-level="1">Facebook Page: Expat Health &amp; Wellness by Phyathai </li>
</ul>
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Atrial Fibrillation (AFib) is a common heart rhythm disorder that raises stroke risk. Discover its signs, causes, diagnosis, and treatment solutions.

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