Heart Health Heart Disease Palpitations & Arrhythmias Arrhythmia Guide Arrhythmia Guide Symptoms Causes Diagnosis Treatment Symptoms of Cardiac Arrhythmias By Richard N. Fogoros, MD facebook linkedin Richard N. Fogoros, MD, is a retired professor of medicine and board-certified internal medicine physician and cardiologist. Learn about our editorial process Richard N. Fogoros, MD Medically reviewed by Medically reviewed by Yasmine S. Ali, MD, MSCI on June 15, 2020 facebook twitter linkedin Yasmine S. Ali, MD, MSCI, is a board-certified preventive cardiologist and lipidologist. Dr. Ali is also an award-winning writer. Learn about our Medical Review Board Yasmine S. Ali, MD, MSCI Updated on May 03, 2021 Print Table of Contents View All Table of Contents Classic Symptoms Other Symptoms When to See a Doctor Frequently Asked Questions Next in Arrhythmia Guide What Causes Cardiac Arrhythmias? Cardiac arrhythmias can produce a range of symptoms—from very mild, like lightheadedness, to life-threatening, including cardiac arrest. These can be divided into a “classic” group of symptoms that are highly (though not exclusively) indicative of cardiac arrhythmia and an “other” group of symptoms that are just as likely to be caused by an arrhythmia as something else. But many times, much to patients' surprise, cardiac arrhythmias may not produce any symptoms at all. This is especially true for arrhythmias that produce intermittent “extra” heartbeats—namely, premature atrial complexes (PACs) and premature ventricular complexes (PVCs). © Verywell, 2018 Classic Symptoms When a patient presents with classic symptoms, a doctor should look specifically for a cardiac arrhythmia as the cause. These classic symptoms include: Palpitations Lightheadedness Syncope Cardiac arrest While there could be another cause to blame, arrhythmia is likely. Palpitations Palpitations are an unusual awareness of the heartbeat. They are commonly experienced as disturbing skips or pauses, intermittent heartbeats that feel too strong or pounding, episodes of rapid or “runaway” heartbeats, or heartbeats that are perceived to be irregular instead of steady. Palpitations affect different people in different ways. Some people don’t find them particularly bothersome, while others find them extremely distressing and frightening. Almost any cardiac arrhythmia can produce palpitations, including the many types of bradycardia (slow heart rate) and tachycardia (rapid heart rate), PACs and PVCs, and episodes of heart block. Lightheadedness If a cardiac arrhythmia is preventing the heart from pumping blood sufficiently to provide the body’s needs, episodes of lightheadedness may result. When an arrhythmia is producing lightheadedness, it is more likely to do so when you are upright, or when you are doing something active. Resting or lying down tends to improve this symptom. Lightheadedness is a common symptom that has many potential causes. But when an arrhythmia produces lightheadedness, it is a sign that the arrhythmia itself may be dangerous. Because lightheadedness may be a sign of a potentially dangerous problem like syncope or cardiac arrest, this is a symptom that should always be evaluated by a physician. Syncope Syncope, or transient loss of consciousness, is a fairly common problem that (like lightheadedness) has numerous potential causes, many of which are pretty benign. But when syncope is caused by a cardiac arrhythmia, that’s a good sign that the arrhythmia itself is quite dangerous. It usually means that the arrhythmia is preventing the brain from receiving enough oxygen to maintain consciousness. Episodes of syncope can result from either bradycardia (if the heart rate is slow enough) or tachycardia (if the heart rate is fast enough). For this reason, an episode of unexplained syncope always requires a full medical evaluation to pinpoint the underlying cause. Any arrhythmia that has caused syncope should be considered potentially life-threatening and should be treated aggressively. Cardiac Arrest A cardiac arrest occurs when the heart stops beating. Although there may be other causes for this, the main consideration is the function of the electrical activity of the heart and the heart's rhythm. While severe bradycardia may cause a cardiac arrest, most often this condition is produced by ventricular fibrillation or ventricular tachycardia. Cardiac arrest invariably leads to rapid death (and is the main cause of sudden death) unless either the arrhythmia terminates by itself or effective cardiopulmonary resuscitation is administered within a very few minutes. Anyone who has survived a cardiac arrest should be considered to be at high risk for subsequent episodes of cardiac arrest and should receive aggressive and effective therapy. Most of these people will be strong candidates for an implantable defibrillator. Cardiac system without and with arrhythmia. Other Symptoms In addition to these classic symptoms, cardiac arrhythmias may also produce several less specific symptoms that may not necessarily point a doctor toward considering an arrhythmia as the cause. Most of these “other” symptoms are related to an arrhythmia causing a relative reduction in the ability of the heart to pump blood to the body’s organs. These symptoms are more likely to occur when a person is upright or exerting themself and in people who have other medical conditions in addition to the arrhythmia, such as heart failure, diabetes, lung problems, or coronary artery disease. These symptoms include: Fatigue Dyspnea (shortness of breath) Poor exercise tolerance Generalized weakness Confusion Chest pain When to See a Doctor Any of these symptoms should prompt a visit to the doctor. An episode of severe lightheadedness or unexplained syncope should be evaluated immediately and warrants a call to 911. Arrhythmia Doctor Discussion Guide Get our printable guide for your next doctor's appointment to help you ask the right questions. Download PDF Email the Guide Send to yourself or a loved one. Sign Up This Doctor Discussion Guide has been sent to {{form.email}}. There was an error. Please try again. While many cardiac arrhythmias are fairly common and usually benign, others are dangerous and need to be treated. This means it is important for your doctor to identify whether an arrhythmia is producing your symptoms, and if so, which specific arrhythmia is causing the problem and how aggressive it should be treated. Frequently Asked Questions What does it feel like to have a cardiac arrhythmia? An arrhythmia may be barely noticeable—like a skipped heartbeat that happens only occasionally. It may also feel like a fluttering in your chest. Because an arrhythmia prevents the heart from effectively pumping blood to the body and brain, it can also cause shortness of breath, feelings of light-headedness or faintness, or even, in the most serious cases, loss of consciousness or death. Does a cardiac arrhythmia always produce symptoms? No. In fact, sometimes you may not even know you have an arrhythmia. This is why it’s important to get regular health checkups, especially if you have risk factors for an arrhythmia or other forms of heart disease. Are palpitations the same as an arrhythmia? No. Palpitations are a symptom that may be caused by an underlying arrhythmia, or they can be caused by stress or other factors. They can occur in healthy people and may not always indicate a more serious condition. What Causes Cardiac Arrhythmias? Was this page helpful? Thanks for your feedback! Did you know the most common forms of heart disease are largely preventable? Our guide will show you what puts you at risk, and how to take control of your heart health. Sign Up You're in! Thank you, {{form.email}}, for signing up. There was an error. Please try again. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. American Heart Association. Symptoms, diagnosis and monitoring of arrhythmia. 2014. January CT, Wann LS, Alpert JS, et al. 2014 AHA/ACC/HRS guideline for the management of patients with atrial fibrillation. 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