Most heart palpitations are benign. That fluttering, pounding, or skipped-beat sensation in your chest can feel alarming, but in the majority of cases it reflects a temporary electrical hiccup in the heart rather than a dangerous problem. One retrospective study in a family practice setting found no difference in rates of illness or death between patients who reported palpitations and matched control subjects who didn’t. Still, recurring palpitations deserve attention, because understanding the cause is the only way to know whether yours fall into the harmless category or signal something that needs treatment.
What’s Actually Happening in Your Heart
Your heart runs on a precise electrical system that tells each chamber when to contract. A palpitation happens when that system fires out of sequence or at the wrong speed. The two most common culprits are premature atrial contractions (PACs), where an upper chamber fires early, and premature ventricular contractions (PVCs), where a lower chamber fires early. Both create that distinctive “skipped beat” feeling, which is actually the pause before your heart resets to its normal rhythm, followed by a stronger-than-usual beat.
Nearly everyone experiences occasional PACs and PVCs. They become clinically meaningful only when they’re frequent. Researchers define a low PVC burden as fewer than 1,000 extra beats per day, with a mean burden close to zero percent. A moderate-to-high burden, above 1,000 per day, averaged 4.6% of all heartbeats in one large study, and that higher burden was associated with roughly double the risk of developing atrial fibrillation (5.3% vs. 2.4%). So frequency matters more than the mere presence of extra beats.
Lifestyle Triggers That Get Blamed
Caffeine, alcohol, and nicotine are the classic suspects. Guidelines from the American College of Cardiology and American Heart Association recommend reviewing and eliminating all three when someone reports extra beats. Caffeine in particular raises levels of stress hormones like norepinephrine and epinephrine, which can theoretically increase irregular beats.
The actual evidence on caffeine is more nuanced than most people expect. The largest study to evaluate dietary patterns and cardiac extra beats using 24-hour heart monitoring found no relationship between regular caffeine consumption and the frequency of PACs or PVCs. After adjusting for other factors, each additional serving per week of coffee, tea, or chocolate showed no meaningful increase in irregular beats. That doesn’t mean caffeine can’t trigger palpitations in a specific person, but it does suggest that blanket advice to quit coffee may be overstated. Alcohol and nicotine, on the other hand, have more consistent links to rhythm disturbances and are worth reducing if you’re having frequent episodes.
Anxiety and the Fight-or-Flight Response
If your palpitations tend to show up during stressful moments, at bedtime when your mind is racing, or during a panic attack, your nervous system is likely the driver. Anxiety activates the autonomic nervous system’s fight-or-flight response, which directly increases heart rate and can trigger the sensation of a pounding or racing heart. This is not “all in your head.” It’s a measurable surge in heart rate caused by the same stress hormones that prepare your body to run from danger.
The tricky part is that palpitations themselves cause anxiety, which causes more palpitations. Breaking that cycle often requires addressing the anxiety directly, whether through breathing techniques, therapy, or other approaches, rather than focusing exclusively on the heart.
Medical Conditions That Affect Heart Rhythm
When palpitations are persistent and don’t clearly tie to stress or lifestyle, an underlying medical condition may be involved. Thyroid disease is one of the most common non-cardiac causes. An overactive thyroid directly alters the electrical behavior of heart cells by changing how sodium, potassium, and calcium channels function. It also speeds up the pacemaker cells that set your heart’s baseline rhythm and can increase cardiac output by 50% to 300% above normal. If your palpitations come with unexplained weight loss, heat intolerance, or tremors, a simple blood test can check your thyroid levels.
Low iron (anemia) forces the heart to pump harder to deliver enough oxygen, which can produce a fast or pounding heartbeat. Electrolyte imbalances, particularly low potassium or magnesium, disrupt the electrical signals that coordinate each heartbeat. Dehydration, heavy sweating, vomiting, and certain medications can all shift your electrolyte balance enough to trigger palpitations.
Medications That Cause Palpitations
Several common medications list palpitations as a side effect. Asthma inhalers containing albuterol, a short-acting bronchodilator, can cause a rapid heart rate or a fluttering sensation. Decongestants containing pseudoephedrine stimulate the cardiovascular system in a similar way. Some antidepressants, ADHD medications, and even certain herbal supplements can have the same effect. If your palpitations started or worsened around the time you began a new medication, that timing is worth noting for your doctor.
How Palpitations Are Diagnosed
The challenge with palpitations is that they often come and go unpredictably, so a standard electrocardiogram done in a clinic may look completely normal. To catch what’s happening during an actual episode, doctors use portable monitors. A Holter monitor is a small recording device connected to electrodes on your chest that continuously tracks your heart rhythm over 24 hours or longer. If your episodes are less frequent, an event monitor may be more useful. Unlike the Holter, it doesn’t record continuously. Instead, you activate it when you feel symptoms, capturing the rhythm disturbance in real time.
Your doctor may also order blood work to check thyroid function, electrolyte levels, and red blood cell counts, ruling out the non-cardiac causes described above. An echocardiogram, which is an ultrasound of the heart, can check for structural problems if there’s reason to suspect one.
Stopping a Palpitation Episode at Home
If you feel an episode starting, a technique called the Valsalva maneuver can sometimes reset your heart rhythm without medication. Close your mouth and pinch your nose shut, then bear down as if you’re straining to have a bowel movement. Hold that pressure for 15 to 20 seconds, then release and breathe out. This stimulates the vagus nerve, which acts as a brake on heart rate. The standard method works for about 16% of people. A modified version, where you lie down and have someone raise your legs immediately after you stop straining, works for about 46%.
Other vagus nerve strategies include splashing cold water on your face, coughing forcefully, or placing an ice pack on your forehead. These work best for a specific type of fast rhythm called supraventricular tachycardia and won’t necessarily help with isolated skipped beats, but they’re safe to try.
Signs That Need Immediate Attention
Most palpitations pass on their own within seconds or minutes. But certain accompanying symptoms change the picture. Palpitations paired with chest pain, shortness of breath, nausea, severe lightheadedness, or fainting require urgent medical evaluation. As one cardiologist put it, the feeling that you’re about to pass out, or actually passing out, is “a big problem” that needs attention sooner rather than later. These combinations can indicate a serious arrhythmia or, in rarer cases, a heart attack. If those symptoms appear together, calling emergency services is the right move.