Heart palpitations are moments when you become unusually aware of your heartbeat. They can feel like your heart is beating too fast, pounding hard, fluttering, flip-flopping, or skipping beats. Most people feel them in the chest, but they can also show up in the throat or neck. About 16% of people visit their primary care doctor specifically because of palpitations, making this one of the most common reasons people seek medical attention.
The good news: the vast majority of palpitations are harmless. They last a few seconds to a few minutes, resolve on their own, and don’t signal anything dangerous. But in some cases, they point to an underlying heart rhythm problem that needs treatment. Understanding what triggers them and which symptoms deserve attention can save you a lot of unnecessary worry.
What Palpitations Actually Feel Like
People describe palpitations in surprisingly different ways, which can make them confusing. Some feel a rapid fluttering, like a bird is trapped in their chest. Others notice a single hard “thud” followed by a pause, which is the classic sensation of a skipped beat. That pause isn’t actually your heart stopping. It’s an extra beat arriving early, followed by a longer-than-normal gap before the next regular beat. The beat after that pause is often stronger than usual, which is why it feels so noticeable.
Palpitations can last just a second or two, or they can persist for minutes. Some people get them daily. Others have a single episode and never experience them again. The sensation itself isn’t pain, though it can be alarming enough to cause anxiety, which then makes the palpitations worse.
Common Triggers That Are Usually Harmless
Most palpitations trace back to everyday substances and situations rather than heart disease. Caffeine is one of the most frequent culprits. Some people are significantly more sensitive to it than others, and for those individuals, even a single cup of coffee can set off noticeable fluttering or racing. Nicotine, alcohol, and recreational stimulants have similar effects.
Stress, anxiety, and poor sleep are equally common triggers. When your body releases stress hormones, your heart rate increases and beats more forcefully. This is a normal response, but if you’re already on edge, the sensation of a pounding heart can create a feedback loop where the awareness of your heartbeat fuels more anxiety.
Dehydration and skipping meals can also bring on palpitations. So can intense exercise, especially if you’re not well-conditioned for the activity. Even lying down in certain positions (particularly on your left side) makes some people more aware of their heartbeat simply because the heart sits closer to the chest wall in that position.
Medications That Can Cause Them
Several common over-the-counter and prescription drugs list palpitations as a side effect. Asthma inhalers that contain bronchodilators are among the most well-documented triggers, with some studies reporting irregular heart rhythms in up to 21% of people using nebulized versions. Cold and sinus medications containing decongestants stimulate the same pathways, essentially mimicking adrenaline’s effect on the heart. Stimulant medications used for ADHD, diet pills, and certain thyroid replacement doses that are too high can do the same.
If your palpitations started around the time you began a new medication, that connection is worth mentioning to your doctor.
Hormonal Changes and Palpitations
Fluctuating hormone levels are a major and underrecognized cause of palpitations, particularly in women. As many as 54% of women report palpitations during menopause. The surges and drops in estrogen that occur during this transition directly affect how the heart’s electrical system behaves. Many women also notice palpitations arriving alongside hot flashes, which makes sense because both are triggered by the same hormonal shifts.
Pregnancy is another common time for palpitations. Blood volume increases by roughly 50% during pregnancy, which means the heart has to work harder with every beat. Palpitations during the menstrual cycle, particularly in the days before a period, follow the same hormonal pattern.
An overactive thyroid gland is a less common but important cause. Excess thyroid hormone speeds up nearly every process in the body, including heart rate. If palpitations come with unexplained weight loss, heat intolerance, or trembling hands, thyroid function is worth checking.
Electrolyte Imbalances
Your heart’s electrical system depends on a precise balance of minerals in your blood, especially potassium and magnesium. When levels of these electrolytes drop too low (or climb too high), the heart’s rhythm can become erratic. This happens most often with heavy sweating, prolonged vomiting or diarrhea, certain blood pressure medications that increase urination, or consistently poor dietary intake. A significant imbalance can cause serious rhythm problems, but milder deficiencies are far more common and typically produce occasional skipped beats or brief racing episodes.
When Palpitations Signal a Heart Rhythm Problem
A small percentage of palpitations are caused by actual arrhythmias. The most common are premature beats, which are extra heartbeats that originate either in the upper chambers (premature atrial contractions) or the lower chambers (premature ventricular contractions, often called PVCs). Nearly everyone has occasional premature beats. They’re almost always benign, though they can feel unsettling.
More significant rhythm disorders include atrial fibrillation, where the heart’s upper chambers fire chaotic electrical signals and produce a fast, irregular rhythm. Atrial fibrillation affects millions of people and increases the risk of stroke, so it’s worth identifying. Supraventricular tachycardia causes episodes of sudden rapid heartbeat that start and stop abruptly, sometimes lasting minutes to hours. Ventricular tachycardia, which originates in the lower chambers, is rarer but more serious.
The pattern of your palpitations offers clues. A single “thump” or skipped beat is usually a premature beat. A sudden burst of rapid heartbeat that starts and stops like a light switch suggests supraventricular tachycardia. A persistent irregular rhythm, especially one that feels chaotic rather than just fast, raises the possibility of atrial fibrillation.
Symptoms That Need Immediate Attention
Palpitations on their own are rarely an emergency. But certain accompanying symptoms change the picture significantly. Seek emergency care if palpitations come with chest pain lasting more than a few minutes, dizziness or fainting, or significant shortness of breath. These combinations can indicate that the heart isn’t pumping blood effectively during the rhythm disturbance.
How Palpitations Are Diagnosed
The biggest challenge in diagnosing palpitations is that they often aren’t happening when you’re sitting in the doctor’s office. The first step is usually an electrocardiogram (ECG), a painless test that takes about 10 seconds and records your heart’s electrical activity through sticky patches on your chest. If the ECG is normal (which it often is, since palpitations tend to come and go), the next step is catching them in real time.
A Holter monitor is a portable ECG device you wear for 24 to 48 hours while going about your normal routine. It continuously records your heart rhythm, looking for irregularities you may or may not feel. If your episodes are less frequent than once a week, an event recorder is more practical. You wear it for up to 30 days and press a button when symptoms occur, which captures the rhythm at that exact moment.
An echocardiogram, which uses ultrasound to create moving images of the heart, may be ordered if there’s concern about a structural problem. It shows how well the heart muscle is squeezing and whether the valves are functioning properly. For most people with palpitations, these tests come back reassuring.
Reducing Palpitations on Your Own
If your palpitations are linked to lifestyle triggers, the fix is often straightforward. Cutting back on caffeine, alcohol, or nicotine can eliminate episodes entirely for some people. Managing stress through regular exercise, adequate sleep, and breathing techniques reduces the frequency for others. Staying well-hydrated and eating regular meals helps maintain the electrolyte balance your heart depends on.
Keeping a brief log of when palpitations happen, what you were doing, and what you consumed beforehand can reveal patterns that aren’t obvious otherwise. This record is also extremely useful if you end up seeing a doctor, since it gives them more to work with than a description of “my heart flutters sometimes.”