That sudden thud or flutter in your chest is almost certainly a premature heartbeat, an extra beat that fires slightly ahead of schedule and throws off your heart’s normal rhythm. It’s extremely common: a study of healthy adults aged 25 to 41 found that 69% of them had at least one premature beat during a single 24-hour monitoring period. Most people experience these occasionally without ever knowing it, and only notice them when the sensation happens to be strong enough to feel.
What Actually Happens During a “Skipped” Beat
Your heart doesn’t actually skip. What happens is that an electrical signal fires from somewhere other than the heart’s usual pacemaker, triggering a contraction slightly earlier than expected. Because this premature beat occurs before the heart has fully filled with blood, it pumps out less than usual and you barely feel it, or don’t feel it at all. Then comes the real culprit behind the sensation: a longer-than-normal pause while the heart resets its rhythm. The next beat after that pause is extra forceful because the heart had more time to fill, and that’s the “thump” or “flip” you notice in your chest.
So the feeling of a skipped beat is really two things layered together: a weak beat you might miss, followed by a strong one you definitely don’t.
Common Triggers
Several everyday factors make premature beats more likely. Caffeine, alcohol, and nicotine all increase the electrical excitability of heart cells, making it easier for a stray signal to fire. Alcohol and aged cheeses, cured meats, and dried fruit contain an amino acid called tyramine, which can raise blood pressure and trigger palpitations on its own. Dehydration and large meals can also set them off, partly by shifting blood flow and electrolyte balance.
Stress and anxiety are among the most common triggers. When your body enters a fight-or-flight state, it floods your system with adrenaline and related hormones. These chemicals act directly on the heart’s pacemaker cells, steepening the electrical ramp-up between beats and making the heart fire faster. That same mechanism can also make the heart more prone to firing from the wrong spot, producing premature beats. Many people notice palpitations most during periods of high stress, even when they’re sitting still.
Why Sleep Matters More Than You’d Expect
Poor sleep shifts the balance of your nervous system in a way that mimics chronic low-grade stress. Normally, your body’s calming branch (the parasympathetic system) dominates during rest, keeping your heart rate low and steady. Sleep deprivation suppresses that calming input and ramps up the stimulating branch instead. Research on sleep-deprived individuals shows measurable drops in parasympathetic heart control, along with increased heart rate, blood vessel constriction, and higher peripheral resistance. In practical terms, running on too little sleep puts your heart in a more reactive, irritable electrical state, exactly the conditions that favor premature beats.
When Skipped Beats Are Harmless
For most people, they are. The median number of premature beats recorded in healthy young adults over 24 hours was just two. Even at the high end, 95% of healthy participants had fewer than 193 in a full day. Occasional premature beats with no other symptoms are considered a normal variation of heart function, not a sign of disease. They tend to come and go with triggers like caffeine, stress, or poor sleep, and often disappear when those triggers resolve.
If you notice them only once in a while, they don’t last long, and you feel fine otherwise, there’s very little reason to worry.
Signs That Need Attention
Skipped beats deserve prompt medical evaluation when they come with other symptoms. The Mayo Clinic identifies four that warrant emergency attention: chest discomfort or pain, fainting, severe shortness of breath, and severe dizziness. Palpitations that happen frequently throughout the day, last for extended periods, or get progressively worse over weeks also merit a conversation with a doctor, even without those emergency symptoms.
When premature beats become very frequent, accounting for a high percentage of all heartbeats over the course of a day, they can eventually weaken the heart muscle over time. This is uncommon, but it’s the main reason doctors sometimes investigate further when patients report persistent, daily palpitations.
How Doctors Investigate
The standard first step is a portable heart monitor you wear while going about your normal life. A Holter monitor records continuously for one to 14 days, depending on the version. If your symptoms are less frequent, an event monitor or mobile telemetry device can track your heartbeat for up to 30 days, capturing episodes that a shorter recording might miss. In rare cases where symptoms are very infrequent but concerning, a small implantable monitor can sit under the skin and record data for three to seven years, transmitting results remotely every 30 days.
The goal is straightforward: catch the palpitations on a recording so your doctor can see exactly what your heart’s electrical activity looks like during those moments. Most of the time, the recording confirms benign premature beats and nothing more.
Reducing Premature Beats on Your Own
Because most skipped beats are triggered by identifiable lifestyle factors, you can often reduce them significantly without medical treatment. Cutting back on caffeine and alcohol is the most common first step. Staying well hydrated, managing stress through exercise or relaxation techniques, and prioritizing consistent sleep all help restore the nervous system balance that keeps the heart’s electrical system steady. Nicotine in any form, including vaping, is worth eliminating if palpitations are frequent.
Keeping a simple log of when you feel skipped beats and what you were doing, eating, or drinking beforehand can reveal patterns that aren’t obvious otherwise. Many people find that one or two specific triggers account for most of their episodes, and addressing those triggers makes the sensation largely disappear.