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What is Heart Flutter and Why Does It Occur?

A comparison diagram showing a heart with a normal, coordinated contraction versus hearts in atrial fibrillation.
July 16, 2025
by Dr. Karthigesan

You might not give it a second thought until your heart does something abnormal, like it's fluttering, pounding, racing, or skipping a beat. This sensation—termed a heart flutter/palpitations (medically)—suddenly makes you aware of each rhythm shift.

And here’s the real question: Do you feel a fluttering in your chest? Although this feeling can be deeply unsettling, a flutter isn't always cause for immediate alarm. Understanding what is heart flutter and what causes them is crucial. This awareness can make a world of difference in your heart health and guide you to consult a cardiac electrophysiologist if you/your loved ones experience this condition.

This guide unpacks what actually happens when your heart starts acting weird. Let's start by breaking down the most common reasons.

What Causes Heart Flutters: Unveiling the Common Factors

Essentially, your daily habits and overall health significantly contribute to triggering heart flutters. Here are a few common causes of sudden heart fluttering:

  • Stress and Anxiety: Your body releases adrenaline when you are anxious/worried. This hormone can make your heart beat irregularly and at a faster rate.
  • Stimulants: Stimulants found in coffee, energy drinks, and pre-workout supplements can cause your heart to beat erratically. Maybe four cups of coffee are too much.
  • Nicotine and Alcohol: Both aggravate the heart muscle and increase the risk of palpitations. Heart rhythm issues are particularly well-known to be triggered by heavy drinking.
  • Overexertion During Exercise: Exerting too much energy might make your heart race or miss beats since it discharges stress chemicals.
  • Dehydration: When you don't drink sufficient water, your body's mineral balance gets disturbed. Your heart requires the right levels of magnesium and potassium in order to beat steadily.
  • Lack of Sleep: Your heart becomes more vulnerable to stimulants and stressors, such as caffeine, when you don’t get enough sleep, which makes palpitations more probable.

This list provides the answer to the key question, “What causes heart flutters?” And correcting these lifestyle problems (usually) tends to help a lot. But if your heart still flutters even after you make changes, it could be a sign of more severe issues—our next area of exploration.

Common Scenarios When a Heart Flutter Signals a Medical Condition

Sometimes, your heart flutters don't subside/go away—no matter what you try. In such cases, you might be dealing with an arrhythmia, or abnormal heart rhythm, where underlying medical conditions can strain the heart and interfere with these vital signals.

The key conditions that can contribute to arrhythmias include:

  • Hypertension and Coronary Artery Disease: When your blood pressure is too high or your arteries are clogged, your heart must work a lot harder than it should. This added strain can mess with your heart's normal rhythm.
  • Heart Valve Problems: Consider heart valves like doors that control blood flow. When they don't open or close the way they should, blood doesn't flow through your heart smoothly, which can cause its regular rhythm to be disrupted.
  • Overactive Thyroid: Your thyroid controls how fast your body runs. When it's overactive, everything accelerates—including your heart rate. It feels as if your body is stuck in overdrive.
  • Sleep Apnoea: If you stop breathing repeatedly during sleep, your heart doesn't get enough oxygen. This lack of oxygen can trigger irregular heartbeats and palpitations.

When these conditions mess with your heart's electrical system, you need a doctor to figure out what's wrong and how to fix it.

Now let's talk about two specific types of serious heart rhythm problems:

  1. Atrial Flutter (AFL): The atria (heart's upper chambers) beat abnormally fast.
  2. Atrial Fibrillation (AFib): The atria beat abnormally and out of sync with the ventricles, or lower chambers.

Is Atrial Flutter A Serious Condition?

Yes, it's considered a serious condition because, similar to AFib, it can lead to major complications. Both conditions result from a “malfunction in your heart's electrical system”—an issue that causes your upper chambers to beat so fast that they can no longer function properly.

What Is The Difference Between Atrial Flutter And Atrial Fibrillation (Afib)?

With AFL, your heartbeat is fast but still remains organised and regular. In contrast, AFib is characterised by a chaotic, irregular rhythm, making your atria quiver ineffectively. Such fast, uncoordinated activity in both conditions restricts how well your heart can pump blood out of its upper chambers.

Next, let’s look at the signs that may call for professional care.

Also Read: What Makes Heart Arrhythmias Different From Heart Palpitations

Recognising Warning Signs That Require Medical Attention

Most heart flutters aren’t harmful by themselves. But when they are accompanied by other symptoms, that’s when you should be concerned. Get emergency medical help if a flutter comes along with any of these red-flag signs given below:

  • Pain/pressure in your chest—particularly if it radiates down your arm or up to your jaw
  • Can't catch your breath—especially when you're just sitting around doing nothing
  • Dizzy, lightheaded, or feel like you might pass out
  • Suddenly finding yourself totally exhausted—like all your energy just disappeared

These signs could signal serious conditions—such as a heart attack/dangerous arrhythmias—because they (often) indicate your heart isn’t pumping sufficient blood to your body and brain. Thus, if you experience a flutter with any of these symptoms, call emergency services immediately.

So, what happens when you visit a doctor for heart flutters? Let's demystify it.

How Doctors Diagnose and Treat Heart Rhythm Issues

When you consult a cardiologist about heart flutters, they'll recommend assessing your heart function using the following tests:

  • Electrocardiogram (ECG) to monitor your heart’s electrical signals
  • Holter monitor to track your heart function for several days
  • Echocardiogram to assess your heart’s pumping capability
  • Blood test to check if thyroid issues or mineral deficiencies are causing the problems

Wondering what happens next once your condition is diagnosed? Your doctor will create a treatment plan just for you.

How Is Atrial Flutter/Atrial fibrillation Treated?

Here's how Atrial Flutter is treated

  • Lifestyle modifications—like managing stress, proper hydration, and quitting smoking, alcohol, and caffeine, which trigger your arrhythmias
  • Medications to slow down the heart rate/regulate its rhythm and occasionally blood thinners to prevent clots from forming, which reduces the chance of having a stroke
  • Medical interventions like cardioversion—in which a mild shock is administered to reset the rhythm
  • Radio frequency Ablation guided by advanced 3D mapping technology to eliminate the flutter is the most effective and successful treatment
  • Cryo balloon ablation for atrial fibrillation is an effective treatment compare to medications

This treatment approach is similar to how other serious arrhythmias are managed and may involve one or a combination of these methods.

Taking Proactive Steps for Your Heart Health

Heart flutters can be scary when they happen. Understanding what causes heart flutters in your specific case helps determine whether lifestyle modifications or professional care are needed.

Recurring or worsening heart flutters? At Dr. Karthigesan Heart Rhythm Clinic, Chennai, we provide complete care and treatment for heart flutters. With our professional, expert diagnosis, you can take the right action at the right time. Schedule a consultation with us today—because every beat matters!

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Dr. Karthigesan

Dr Karthigesan A.M is an Electrophysiologist in Chennai, and a Senior Consultant Cardiologist, practising at the renowned Apollo Hospital in Chennai. He also conducts frequent consultations at Apollo's branches in Madurai, Trichy, and Guwahati. He holds an international certification in Cardiac Electrophysiology, making him an expert in his field.
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Photo of Dr. Karthigesan A.M, Senior Consultant Cardiologist, Apollo Hospitals, Chennai.

Dr. A. M. Karthigesan

Interventional Cardiologist in Chennai

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