Heart palpitations feel like your heart is pounding, fluttering, flip-flopping, or beating out of rhythm. Some people describe it as a skipped beat followed by a hard thump. Others feel a rapid fluttering in the chest that lasts a few seconds and then stops. The sensation ranges from barely noticeable to alarming, but most episodes are harmless.
How People Describe the Feeling
The most common descriptions fall into a few distinct categories. You might feel your heart racing or beating unusually fast, even when you’re sitting still. Some people feel a strong pounding sensation, as if the heart is beating harder than normal rather than faster. Others notice a fluttering quality, like a bird’s wings inside the chest.
The “skipped beat” sensation is one of the most recognizable. It feels like your heart pauses, then delivers one heavy thump to catch up. What’s actually happening is a premature beat, a contraction that fires slightly early. The beat itself is often too weak to feel. But the pause that follows allows extra blood to fill the heart, and the next beat ejects that larger volume with more force. That forceful contraction is the thump you notice. So the sensation you interpret as a skip is really the strong beat afterward.
Some people feel a flip-flopping sensation, as if the heart momentarily turned over in the chest. This can happen with the same premature-beat mechanism or with brief runs of irregular rhythm.
Where You Feel Them
Most people feel palpitations in the center of the chest, but the sensation isn’t limited to that spot. It’s common to notice a pulsing or fluttering in the throat or neck, especially with faster rhythms. Some people feel them in the upper abdomen. The location often depends on body position and which type of irregular beat is occurring.
Palpitations tend to feel more intense when you’re lying down, particularly on your left side. Sleeping hunched over or curled up on that side increases pressure inside the chest cavity, which can make you more aware of your heartbeat. This is why many people first notice palpitations at night in bed, when there’s less background noise and physical activity to distract from subtle cardiac sensations.
How Long They Last
Episodes vary enormously. A single skipped beat lasts a fraction of a second. A brief run of rapid or fluttery beats might persist for a few seconds to a few minutes before the heart settles back to normal. Some types of palpitations, particularly those involving sustained fast rhythms, can last for hours or even days.
The pattern of onset and offset tells a lot about what’s causing them. Palpitations that build gradually during stress, exercise, or a fright and then slowly fade are usually your heart’s normal response to adrenaline. Palpitations that switch on and off abruptly at unpredictable times, especially at rest, are more likely tied to an electrical rhythm disturbance. Episodes that start and stop like flipping a light switch are worth paying attention to and tracking.
Common Triggers
Many palpitations have a clear trigger. Caffeine is the one most people suspect first, and individual sensitivity matters here. Research, including randomized trials, shows that moderate caffeine intake (a couple of cups of coffee) doesn’t increase the risk of abnormal heart rhythms in most people. But if you’ve noticed a connection between caffeine and your symptoms, you may be especially sensitive to it. Energy drinks with high caffeine doses are a different story and worth avoiding.
Alcohol has a stronger and more consistent link. Studies show that alcohol in the bloodstream makes the heart more prone to irregular rhythms, and trials have found that people who abstain have fewer recurrences of atrial fibrillation than those who keep drinking. Experts generally recommend no more than three alcoholic drinks per week for people prone to palpitations.
Other common triggers include poor sleep, dehydration, anxiety, nicotine, and certain medications like decongestants or stimulant-based cold remedies. Hormonal shifts during menstruation, pregnancy, or menopause can also increase episodes. Even a large meal can trigger palpitations in some people, as blood flow shifts toward the digestive system.
When Palpitations Signal Something Serious
Most palpitations are benign, but certain accompanying symptoms change the picture. Pay close attention if palpitations come with lightheadedness, near-fainting, or actual loss of consciousness. Chest pain or pressure during an episode, significant shortness of breath, or palpitations that last many minutes without letting up also warrant prompt evaluation.
Palpitations that happen only during exertion and force you to stop what you’re doing are more concerning than those that occur while resting on the couch. A racing heart that exceeds 150 beats per minute and starts or stops abruptly is more likely to reflect a true arrhythmia than the gradual acceleration you feel during a panic attack or exercise.
What Happens During Evaluation
The challenge with diagnosing palpitations is that they’re often gone by the time you’re sitting in a doctor’s office. A standard electrocardiogram captures only a 10-second snapshot, so it rarely catches intermittent episodes.
For daily symptoms, a Holter monitor worn for 24 to 48 hours can record every heartbeat during that window. If your palpitations are less predictable, a continuous event recorder worn for about two weeks gives a much better chance of capturing an episode. Some monitors record automatically when they detect an abnormal rhythm. Others require you to press a button when you feel symptoms, which then saves a short recording of the heart’s electrical activity from that moment. Increasingly, smartwatches with optical heart rate sensors can also provide useful preliminary data to share with your doctor.
One screening question doctors use to distinguish cardiac causes from anxiety-driven palpitations: “Have you experienced brief periods of overwhelming panic or terror accompanied by racing heartbeats, shortness of breath, or dizziness?” Panic disorder is one of the most common non-cardiac explanations for palpitations, and the two conditions can feel nearly identical. The difference often comes down to whether emotional distress precedes the racing heart or follows it.
Reducing Episodes on Your Own
If your palpitations have been evaluated and found to be benign, several lifestyle adjustments can reduce how often they happen. Limiting alcohol to three or fewer drinks per week and moderating caffeine intake are reasonable starting points. Regular physical activity, around 150 minutes per week of brisk walking or similar exercise, has a protective effect on heart rhythm stability.
Avoiding tobacco and managing stress through sleep, breathing exercises, or other techniques can also help. Some people find that staying well-hydrated and avoiding large, heavy meals makes a noticeable difference. Tracking your episodes in a simple log, noting the time, what you were doing, and what you consumed beforehand, can reveal personal triggers that are easy to miss otherwise.