An arrhythmia, or irregular heartbeat, is a problem with the rate or rhythm of your heartbeat.
Your heart may beat too quickly, too slowly, or with an irregular rhythm.
It is normal for your heart rate to speed up during physical activity and to slow down while resting or sleeping. It is also normal to feel as if your heart skips a beat occasionally.
But a frequent irregular rhythm may mean that your heart is not pumping enough blood to your body. You may feel dizzy, faint, or have other symptoms.
Arrhythmias are often caused by a problem with the electrical signals within the heart. Often, an arrhythmia is set off by a trigger. Sometimes the cause of an arrhythmia is not known.
Problems with the heart’s electrical system
Your heart’s electrical signals control how fast your heart beats. A problem with these electrical signals can cause an irregular rhythm.
This can happen when the nerve cells that produce electrical signals do not work properly or when the electrical signals do not travel normally through your heart.
Also, another part of your heart could start to produce electrical signals, disrupting your normal heartbeat.
Conditions that cause a slowing of your heart’s electrical signals are called conduction disorders.
To understand arrhythmias, it helps to understand how your heart’s electrical system works.
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What raises the risk of arrhythmia?
Age
As we age, changes in our heart such as scarring and the effects of other chronic conditions can raise the risk of arrhythmias.
Older adults are also more likely to have health conditions, such as high blood pressure, heart failure, diabetes, and thyroid disease, that can lead to arrhythmias.
Arrhythmias caused by congenital heart defects or inherited conditions are more common in children and young adults.
Family history and genetics
Arrhythmias can run in families. You may have an increased risk of some types of arrhythmias if a parent or other close relative has an arrhythmia.
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Lifestyle habits
Your risk of arrhythmias may be higher if you:
Smoke
Use illegal drugs, such as cocaine or amphetamines
Drink alcohol more often and more than is recommended (no more than 2 drinks per day for men and 1 drink per day for women)
Medicines
Sometimes, medicines your doctor prescribes for other health conditions can cause an arrhythmia. Talk to your doctor about your risk of an arrhythmia if you are taking medicine to treat high blood pressure or for a mental health condition.
Certain antibiotics and over-the-counter allergy and cold medicines can also raise the risk of arrhythmias in some people.
Other health conditions
You may be more likely to have arrhythmias if you have:
Heart and blood vessel diseases, such as cardiomyopathy, congenital heart defects, heart attack, and heart inflammation
Kidney disease
Lung diseases, such as chronic obstructive pulmonary disease (COPD)
Obesity
Sleep apnea, which can stress your heart by preventing it from getting enough oxygen
Too much or too little thyroid hormone
Viral infections such as influenza (flu) or COVID-19
Surgery
You may be at a higher risk of developing arrhythmias in the early days and weeks after surgery involving your heart, lungs, or throat.
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Source: NIH
