Most heart palpitations are harmless. About 16% of people visit their doctor because of palpitations at some point, making them one of the most common cardiac complaints. In the majority of cases, palpitations stem from temporary triggers like caffeine, stress, or dehydration rather than a dangerous heart condition. That said, a small percentage of palpitations signal an underlying rhythm problem that needs attention, and knowing the difference matters.
What Palpitations Usually Feel Like
Palpitations can show up in several ways, and the specific pattern offers clues about what’s going on. Occasional “skipped beats” are typically caused by premature contractions, which are extra heartbeats that originate in the upper or lower chambers of the heart. These are extremely common, even in people with perfectly healthy hearts, and generally require nothing more than reassurance.
A sudden burst of rapid, regular beating that starts and stops abruptly points toward a different type of rhythm issue called supraventricular tachycardia, or SVT. The heart rate during these episodes can reach 200 beats per minute. If an episode lasts only a few seconds, it feels like a flutter or flip-flop. If it stretches beyond a few minutes, the heart may not fill completely between beats, leading to dizziness, breathlessness, or lightheadedness. SVT can strike at any age, including in children, though the average age of diagnosis is 45.
Palpitations that feel irregular and chaotic are more characteristic of atrial fibrillation, which mostly affects people 65 and older. During atrial fibrillation, errant electrical signals fire more than 300 times per minute in the heart’s upper chambers, causing them to quiver instead of contracting normally. The lower chambers follow suit, beating irregularly and sometimes failing to pump blood efficiently.
Common Non-Heart Triggers
Before assuming the worst, it helps to know that many palpitations have nothing to do with your heart’s structure or electrical system. The list of everyday triggers is long:
- Caffeine and stimulants can temporarily increase your heart rate and the force of each beat. This includes coffee, energy drinks, ADHD medications, and over-the-counter cold medicines and decongestants.
- Alcohol affects how your heart beats and raises the chance of developing an irregular rhythm.
- Dehydration thickens your blood, forcing your heart to work harder to push it through your body.
- Stress and anxiety activate the fight-or-flight response, which speeds up your heart rate. A sense of doom or panic during palpitations suggests (but doesn’t confirm) a psychological trigger.
- Low electrolytes like potassium, sodium, calcium, and magnesium help regulate your heartbeat. When they’re out of balance, irregular rhythms can follow.
- Anemia means your blood carries less oxygen, so your heart compensates by beating faster and harder.
- Overactive thyroid can cause a persistently rapid heartbeat or palpitations.
Any of these triggers can produce palpitations that feel alarming but resolve once the underlying cause is addressed. Cutting back on caffeine, staying hydrated, managing stress, or treating a thyroid imbalance often eliminates the problem entirely.
When Palpitations Are More Serious
Palpitations become a concern when they’re accompanied by other symptoms or occur in someone with known heart problems. The key warning signs are fainting or near-fainting, tunnel vision, chest pain, and significant shortness of breath. Fainting after palpitations is particularly notable because it suggests the heart rhythm disruption was severe enough to drop blood pressure and cut blood flow to the brain. This is more likely in people with congenital heart conditions or valve problems.
A family history of unexplained fainting or sudden death at a young age raises the stakes considerably. Several inherited conditions, including Brugada syndrome and long QT syndrome, can cause dangerous heart rhythms that first appear as palpitations. Long QT syndrome typically shows up during adolescence. If close relatives have experienced these events, palpitations deserve a thorough cardiac workup even if they seem brief and mild.
Palpitations triggered by exercise also warrant closer evaluation. While a racing heart during a workout is normal, palpitations that feel distinctly irregular or cause dizziness during exertion can indicate that physical stress is unmasking an underlying rhythm or blood flow problem.
The Real Danger: Untreated Atrial Fibrillation
Among all the rhythm problems that cause palpitations, atrial fibrillation carries the most significant long-term risk. When the upper chambers quiver instead of contracting, blood can pool and stagnate inside them. That stagnant blood is prone to forming clots. If a clot escapes the heart, it can travel to the brain and cause a stroke.
People with atrial fibrillation often need medications to slow the heart rate and anti-clotting drugs to reduce stroke risk. The condition also causes fatigue and breathlessness over time because the heart isn’t pumping blood efficiently. Left untreated, persistent atrial fibrillation can weaken the heart muscle and contribute to heart failure. This is why identifying atrial fibrillation matters even when the palpitations themselves feel tolerable.
How Doctors Evaluate Palpitations
The tricky part of diagnosing palpitations is that they often come and go. A standard electrocardiogram (ECG) takes a snapshot of your heart’s electrical activity in real time, but the test lasts only a few seconds. If your heart is behaving normally during those seconds, the ECG won’t catch the problem.
For palpitations that are intermittent, doctors use a Holter monitor, which is a small, portable ECG device you wear for a day or longer while going about your normal routine. It continuously records your heart’s rhythm, capturing irregularities that happen during sleep, exercise, meals, or stressful moments. Some people now use smartwatches with built-in ECG features, which can flag irregular rhythms between doctor visits.
If there’s concern about structural heart problems, an echocardiogram (an ultrasound of the heart) can reveal issues with the heart’s valves, chambers, or muscle. People whose palpitations occur during physical activity may undergo a stress test, where the heart is monitored while you exercise on a treadmill or stationary bike. These tests help determine whether exertion is triggering a dangerous rhythm.
What Happens After Diagnosis
For the most common types of palpitations, specifically isolated premature beats in people without structural heart disease, the appropriate response is simply reassurance. No treatment is needed, and the palpitations pose no threat to long-term health.
When an underlying arrhythmia like SVT or atrial fibrillation is identified, treatment depends on the type and severity. SVT episodes can sometimes be stopped by simple techniques like bearing down or splashing cold water on your face, which stimulate the nerve that slows heart rate. For frequent or prolonged episodes, procedures or medications can prevent recurrence. Atrial fibrillation management focuses on controlling heart rate, restoring normal rhythm when possible, and preventing stroke with blood-thinning medication.
The overall picture is reassuring: most people who seek medical attention for palpitations learn that their heart is structurally normal and their rhythm disturbance is benign. The value in getting checked is ruling out the small number of cases where palpitations are the first clue to a treatable but potentially serious condition.