Heart palpitations are one of the most common reasons people visit a doctor, and the vast majority turn out to be harmless. That fluttering, racing, or “skipped beat” sensation usually comes from a combination of everyday triggers: stress, caffeine, hormonal shifts, or extra heartbeats that are a normal part of how your heart works. Less commonly, palpitations signal an underlying condition that needs attention.
Understanding why yours happen is the first step toward figuring out whether you can manage them on your own or whether they deserve a closer look.
What Actually Happens During a Palpitation
Most palpitations are caused by ectopic heartbeats, which are extra beats that fire slightly too early. When your heart contracts ahead of schedule, the next regular beat fills the chambers with more blood than usual, producing a stronger-than-normal thump. That’s the “skipped beat” or lurching sensation you feel in your chest or throat. Your heart didn’t actually skip anything; it just fell briefly out of rhythm.
These early beats come in two types. Premature atrial contractions (PACs) originate in the upper chambers of the heart, while premature ventricular contractions (PVCs) come from the lower chambers. Both are extremely common. Most people have at least a few every day without ever noticing them. They only become noticeable when they happen more frequently or when you’re in a quiet moment and tuned in to your body.
Stress, Anxiety, and Adrenaline
When your brain perceives a threat, real or imagined, it triggers your fight-or-flight system. A signal travels from a region deep in your brain down through your spinal cord and out to your body, releasing adrenaline and noradrenaline. These hormones tell your heart to pump harder and faster so it can deliver more oxygenated blood to your muscles. Your blood pressure rises, your breathing quickens, and your heart rate climbs.
This system doesn’t distinguish between a near-miss in traffic and an anxious thought at 2 a.m. Both produce the same cascade of stress hormones. If you’re already prone to ectopic beats, adrenaline can increase their frequency and make each one feel more dramatic. Many people first notice palpitations during periods of high stress, sleep deprivation, or generalized anxiety, then become hyperaware of their heartbeat, which creates a feedback loop that makes the sensation feel worse than it is.
Caffeine, Alcohol, and Other Triggers
Caffeine is a stimulant that can increase heart rate and make ectopic beats more frequent in some people, though sensitivity varies widely. One person may drink three espressos without issue while another gets noticeable palpitations from a single cup of tea. Alcohol has a similar effect, particularly in larger amounts. It can irritate the electrical system of the heart and is a well-established trigger for episodes of irregular rhythm.
Other common triggers include dehydration, nicotine, certain cold and allergy medications that contain stimulants, and large meals (especially those high in sugar or refined carbohydrates, which can cause a rapid insulin response). Keeping a simple log of when your palpitations happen and what you consumed beforehand can help you identify your personal triggers surprisingly fast.
Hormonal Shifts in Women
Palpitations are a common symptom during periods of hormonal change, including the menstrual cycle, pregnancy, and menopause. During menopause in particular, racing heartbeats and palpitations affect many women and are closely linked to fluctuating hormone levels. The drop in estrogen appears to make the heart’s electrical system more reactive, though researchers are still working out the precise mechanism.
If you’re going through menopause and noticing more palpitations, reducing caffeine, alcohol, and nicotine can help. Even small changes, like swapping one caffeinated cup for decaf, may make a noticeable difference. These same substances tend to worsen hot flushes, so cutting back often improves multiple symptoms at once.
Medical Conditions That Cause Palpitations
While most palpitations are benign, certain underlying conditions can produce them and deserve treatment.
Overactive thyroid (hyperthyroidism). Your thyroid gland controls your metabolic rate, and when it produces too much hormone, everything speeds up. Your heart beats faster, you may lose weight without trying, your hands might tremble, and you can feel jittery or anxious. A rapid or irregular heartbeat is one of the hallmark symptoms. A simple blood test can confirm whether your thyroid levels are off.
Anemia. When your blood doesn’t carry enough oxygen, either from iron deficiency or another cause, your heart compensates by beating harder and faster. Palpitations from anemia often come with fatigue, pale skin, and feeling short of breath during activities that didn’t used to wind you.
Electrolyte imbalances. Minerals like potassium and magnesium help regulate your heart’s electrical signals. When levels drop too low, from dehydration, excessive sweating, certain medications, or poor diet, your heart rhythm can become erratic. This is one reason palpitations sometimes show up after intense exercise or illness involving vomiting or diarrhea.
Atrial Fibrillation and Other Arrhythmias
Not all palpitations come from isolated extra beats. Atrial fibrillation (AFib) is the most common sustained arrhythmia, and it feels different from a simple skipped beat. With AFib, the upper chambers of the heart fire chaotically, producing a pulse that feels genuinely irregular, not just a single blip but a sustained, unpredictable rhythm. Your heart rate may climb above 100 beats per minute, and you might feel it pounding, racing, or fluttering for seconds to minutes at a time.
The key distinction: benign ectopic beats tend to feel like a single thump or pause, then your normal rhythm resumes. AFib feels more like a sustained irregularity where you can’t find a steady beat when you check your pulse. AFib isn’t immediately life-threatening in most cases, but it does increase the risk of stroke and needs medical management.
Another type, supraventricular tachycardia (SVT), produces sudden episodes of very fast but regular heartbeat that start and stop abruptly. SVT is usually not dangerous, but episodes can be uncomfortable and sometimes respond to a technique called the Valsalva maneuver: bearing down as if straining on the toilet while lying flat, then having someone raise your legs. A modified version of this technique restores normal rhythm in roughly 46% of people with SVT, compared to about 16% for the standard method.
How Palpitations Are Investigated
If your palpitations are frequent, prolonged, or come with other symptoms, your doctor will likely start with blood tests (checking thyroid function, iron levels, and electrolytes) and an electrocardiogram (ECG), which records your heart’s electrical activity for a few seconds. The challenge is that palpitations often come and go, so a brief ECG may look perfectly normal.
For palpitations that don’t happen on command, the next step is usually a portable monitor. A Holter monitor records your heart’s electrical signals continuously for 24 hours or more, capturing a “movie” of your rhythm rather than a snapshot. If your episodes are less frequent, a cardiac event recorder can be worn for a month or two using patches or clips. You press a button when you feel symptoms, and the device stores the data so your doctor can see exactly what your heart was doing at that moment.
These tools are highly effective at catching the culprit. Most people who go through monitoring get a clear answer, whether it’s reassurance that their rhythm is normal or a diagnosis that guides treatment.
Red Flags to Take Seriously
Most palpitations are harmless, but certain combinations of symptoms suggest something more urgent is happening. Palpitations paired with chest pain or pressure, fainting or near-fainting, severe dizziness, or significant shortness of breath warrant emergency evaluation. These combinations can indicate a dangerous arrhythmia or another cardiac event that needs immediate attention.
Palpitations that happen during heavy exertion rather than at rest, that last many minutes without stopping, or that run in a family with a history of sudden cardiac events also deserve a prompt medical conversation.
Practical Steps to Reduce Palpitations
For the majority of people whose palpitations are benign, lifestyle adjustments make a real difference. Cutting back on caffeine and alcohol is the most common first step, and many people see improvement within days. Staying well hydrated, eating regular meals, and getting enough sleep all reduce the frequency of ectopic beats.
Stress management matters more than most people expect. Slow, deep breathing activates the branch of your nervous system that counteracts adrenaline, physically slowing your heart rate. Even five minutes of deliberate breathing when you notice palpitations can interrupt the stress-palpitation cycle. Regular exercise (moderate, not extreme) also helps stabilize heart rhythm over time by improving your baseline cardiovascular fitness and lowering resting levels of stress hormones.
If you’ve identified a pattern, like palpitations after large meals, during your menstrual cycle, or when you’re sleep-deprived, you can often reduce episodes significantly just by addressing that specific trigger. The goal isn’t to eliminate every extra beat, because that’s neither realistic nor necessary. It’s to bring them down to a level where they stop disrupting your day.