Heart palpitations are most often a sign of something harmless, like too much caffeine, stress, or a temporary spike in adrenaline. In a smaller number of cases, they point to an underlying heart rhythm problem, a hormonal imbalance, or a medication side effect. The sensation itself, whether it feels like your heart is racing, fluttering, pounding, or skipping a beat, doesn’t reliably tell you the cause. What matters more is how often it happens, how long episodes last, and whether other symptoms come along for the ride.
Everyday Triggers That Cause Palpitations
The most common causes aren’t medical conditions at all. They’re substances and situations your body reacts to by temporarily revving up your heart rate. Caffeine, alcohol, nicotine, and recreational stimulants like cocaine and amphetamines can all provoke palpitations. So can spicy or rich foods, intense exercise, and dehydration.
If any of these are behind your palpitations, the fix is straightforward: reduce or remove the trigger and the episodes typically stop. Cutting back on caffeine, limiting alcohol, and quitting tobacco products are the most reliable first steps. Many people who track their palpitations discover a clear pattern tied to one of these triggers within a week or two.
Stress, Anxiety, and Panic
Your autonomic nervous system, the part of your brain that controls heart rate, breathing, and digestion without you thinking about it, responds to perceived threats by triggering the “fight or flight” response. That means a faster, harder heartbeat. You don’t need to be in actual danger for this to kick in. Work stress, relationship tension, or a looming deadline can do it.
Panic attacks are a more intense version of the same mechanism. During a panic attack, the sudden surge of adrenaline can make your heart pound so hard that many people genuinely believe they’re having a heart attack. The palpitations are real, but they’re driven by your nervous system, not a heart problem. People with generalized anxiety disorder or panic disorder often experience palpitations as one of their most frequent and distressing symptoms. Techniques like slow deep breathing, progressive muscle relaxation, yoga, and guided imagery can lower the baseline activity of this stress response over time.
Heart Rhythm Disorders
When palpitations do come from the heart itself, they’re usually caused by one of three common rhythm disturbances.
Premature ventricular contractions (PVCs) are extra beats that originate in the lower chambers of the heart. They feel like a skipped beat or a brief flutter. PVCs are extremely common and rarely dangerous on their own. Occasional PVCs happen in most people. They only become a concern when they’re very frequent over long periods, which can gradually weaken the heart muscle, or when they occur alongside existing heart disease.
Supraventricular tachycardia (SVT) refers to a group of fast rhythms that start in the upper chambers of the heart. The hallmark of SVT is a sudden-onset pounding heartbeat that starts and stops abruptly, almost like flipping a switch. Episodes can last seconds or hours. SVT is usually not life-threatening, but it can be uncomfortable and disruptive enough to need treatment.
Atrial fibrillation (AFib) is the most clinically significant of the three. In AFib, chaotic electrical signals cause the upper chambers to quiver instead of contracting in an organized way, producing an irregular and often very fast heartbeat. AFib episodes may come and go on their own or persist until treated. The biggest concern with AFib isn’t the palpitation itself but the increased risk of stroke, which is why it’s important to identify.
Thyroid and Hormonal Causes
An overactive thyroid gland (hyperthyroidism) produces too much thyroid hormone, which essentially speeds up every system in your body. Your heart is no exception. The extra stimulation commonly causes a resting heart rate above 100 beats per minute and can trigger atrial fibrillation. If your palpitations come with unexplained weight loss, feeling hot all the time, trembling hands, or difficulty sleeping, a thyroid problem is worth investigating. A simple blood test can confirm or rule it out.
Hormonal shifts during menopause and pregnancy are also well-known triggers. Fluctuating hormone levels can make the heart more sensitive to the same adrenaline signals it normally handles without issue, leading to palpitations that come and go unpredictably for weeks or months.
Medications That Can Trigger Palpitations
A surprisingly long list of prescription and over-the-counter medications can cause or worsen palpitations. The most common culprits in everyday life include asthma inhalers (bronchodilators), nasal decongestants, certain antidepressants, and some antipsychotic medications. Even some blood pressure drugs and heart rhythm medications can paradoxically trigger irregular beats.
If your palpitations started shortly after beginning a new medication or changing a dose, that timing is worth mentioning to your doctor. The connection isn’t always obvious, especially with drugs you wouldn’t associate with your heart, like antibiotics or antifungal medications, which can also affect heart rhythm in some people.
How Palpitations Are Diagnosed
The initial workup is usually simple: a detailed history of your symptoms, a physical exam, a standard 12-lead ECG (a quick, painless recording of your heart’s electrical activity), and some basic blood tests to check for thyroid problems, anemia, and electrolyte imbalances. Your doctor will ask about the character of the palpitations (fast, slow, regular, irregular), what you were doing when they started, how long they lasted, and whether you have a personal or family history of heart disease.
The challenge is that palpitations are often gone by the time you see a doctor. A standard ECG only captures about 10 seconds of heart activity. If your episodes are infrequent, a 24-hour Holter monitor, a portable device you wear while going about your day, catches an arrhythmia only about 15 to 39 percent of the time. For less frequent episodes, longer monitoring works better. Adhesive patch monitors that record continuously for up to 14 days significantly improve detection. In one study, 10 out of 11 arrhythmia events missed in the first 24 hours were caught with extended monitoring beyond that first day, including short runs of atrial fibrillation that would otherwise have gone undetected.
Warning Signs That Need Immediate Attention
Most palpitations are harmless, but certain combinations of symptoms signal something more serious. Palpitations paired with sudden loss of consciousness or collapse warrant an immediate trip to the emergency department. The same is true for palpitations accompanied by dizziness and lightheadedness, or any episode that comes with chest pain. These combinations can indicate a dangerous arrhythmia or reduced blood flow to the heart, both of which need rapid evaluation.
Palpitations that last many minutes, happen during physical exertion rather than at rest, or occur alongside shortness of breath also deserve prompt medical attention rather than a wait-and-see approach.