A Calm, Clear Guide to What Else Can Speed Up Your Heartbeat — and When It Is Worth a Closer Look
Credit: Daily Vitality
There is a particular kind of quiet worry that comes with noticing your own heartbeat. One moment you are going about your day, and the next you are intensely aware of your heart — pounding, fluttering, or racing in a way that is hard to ignore. It can happen on the couch, at your desk, or in the stillness of the night.
If you have felt this, you have probably also felt the thought that follows close behind: is this just anxiety, or is something wrong with my heart? It is a reasonable question, and you are far from alone in asking it. A racing heart is one of the most common reasons people go looking for answers.
Here is the reassuring part, and it is worth holding onto as you read. A racing heart is very often harmless. Anxiety is one frequent cause, but it is only one of many. This guide walks gently through the other everyday reasons your heart might speed up, and, just as importantly, the warning signs that mean it is time to get help.
Before we look at the everyday causes, it is worth pausing on the signs that mean a racing heart should not wait.
Medical authorities, including Cleveland Clinic, treat a racing heart as an emergency when it arrives alongside any of the following:
In these situations, the guidance is to call 911 right away. It is also safer not to drive yourself, but instead to have someone take you or to wait for an ambulance.
If none of that describes your situation, that is genuinely reassuring. The Cleveland Clinic describes these symptom combinations as the ones that call for urgent attention precisely because most other racing-heart moments do not.
It helps to put a plain-language name to the feeling. The medical term is heart palpitations, and as the Mayo Clinic describes them, palpitations are sensations that your heart is racing, pounding, fluttering, flip-flopping, or skipping beats. You might feel them in your chest, but also in your throat or neck, whether you are moving around or sitting completely still.
The most important thing to understand is that palpitations are usually harmless and often settle on their own. They are a symptom rather than a diagnosis — a signal that something has nudged your heart's rhythm — and that something is frequently ordinary and temporary. Occasionally palpitations do point to an underlying heart rhythm problem that deserves attention, which is exactly why it is worth understanding both the harmless causes and the signals that call for a closer look.
If your heart tends to race after a second cup of coffee or an energy-drink-fueled morning, your routine may hold the simplest explanation. Caffeine and nicotine are stimulants that naturally rev up your heart rate, and the Mayo Clinic lists them among the most common triggers of palpitations. Caffeine hides in coffee, tea, energy drinks, soda, chocolate, and some pre-workout supplements, while nicotine from cigarettes or vaping products works the same way. A few medicines can have a similar effect, including decongestants that contain pseudoephedrine, some asthma inhalers, and certain thyroid medications. The telltale sign across this whole group is timing: the racing tends to follow the coffee, the cigarette, or the dose, especially when the amount is larger than what your body is used to.
Alcohol is another familiar trigger. Drinking, especially heavier-than-usual or binge drinking, can set off palpitations, and it is a recognized trigger for a heart rhythm disturbance called atrial fibrillation. Doctors sometimes call the pattern "holiday heart," a nod to the way episodes often appear after celebrations and heavier drinking, as the Mayo Clinic Health System explains. You may notice your heart racing during the evening itself, or the morning after. An occasional flutter following a big night is common, but if it keeps happening, it is one of those patterns worth mentioning to a doctor.
Your heartbeat depends on a steady supply of fluid and minerals, so running low on either can leave your heart feeling unsteady. Minerals such as potassium, sodium, calcium, and magnesium — known together as electrolytes — help carry the electrical signals that keep your rhythm even. When you are dehydrated or your electrolytes dip, Cleveland Clinic notes that palpitations can be one result. This is why a racing heart can appear on a hot day, after heavy sweating, or during a stretch of illness with vomiting or diarrhea. Dehydration usually travels with other clues, such as thirst, a dry mouth, darker urine, or mild dizziness, and sipping fluids steadily is a gentle, low-risk first step toward feeling settled again.
Sometimes a fast heartbeat is simply your body doing exactly what it should. Vigorous activity — a hard run, a steep flight of stairs, an intense workout — naturally raises your heart rate to move more oxygen to your muscles, and you may feel that effort as a pounding sensation during or just after exertion. The reassuring tell with exercise is recovery: a heartbeat that climbs with activity and then eases back down as you rest is behaving exactly as it should. What is more worth noticing is the opposite pattern — a racing heart that arrives during gentle activity, or one that refuses to settle long after you have stopped and caught your breath.
When you are fighting a fever or an infection, your body's demand for energy and oxygen rises, and your heart responds by beating faster to keep pace. A racing heart during a bout of flu, a bad cold, or any feverish illness is a common and expected part of being unwell, and it tends to ease as your temperature comes down and you recover. The tell here is context: if your quick heartbeat is keeping company with a raised temperature, chills, or other signs of illness, the illness itself is the likely explanation. A heartbeat that feels dramatically out of proportion to how sick you are, or one paired with chest pain or breathlessness, is a reason to seek care sooner.
Your thyroid is a small, butterfly-shaped gland in your neck, and the hormones it produces help set the pace for much of your body, including your heart. When the thyroid becomes overactive, a condition called hyperthyroidism, it floods the system with extra hormone. According to Harvard Health, that excess overstimulates the heart, which can lead to a fast or pounding heartbeat, palpitations, and sometimes a rhythm disturbance such as atrial fibrillation. A thyroid-related racing heart rarely travels alone — it often comes alongside unexplained weight loss, feeling uncomfortably warm when others are fine, shakiness, restlessness or anxiety-like feelings, or unusual fatigue. A simple blood test can measure your thyroid hormone levels, so if these signs sound familiar, this is a pattern a doctor can check fairly easily.
For many women, a racing heart follows a quieter rhythm of its own — the natural ebb and flow of hormones. Shifts in estrogen and progesterone can influence the heart's electrical activity, which is why palpitations sometimes appear around the menstrual cycle, during pregnancy, or through the years of perimenopause and menopause. The Mayo Clinic includes these hormonal changes among the recognized, and usually benign, causes of palpitations. If your racing heart seems to track with a particular point in your cycle or a particular life stage, that pattern itself is useful information, and noting when episodes happen gives a clinician a clearer picture to work from.
A couple of less obvious causes deserve a place on this list, because both are common and both can be checked with a simple blood test. When your blood sugar drops too low, your body releases stress hormones, including adrenaline, to bring it back up. The National Institute of Diabetes and Digestive and Kidney Diseases describes how that adrenaline surge can cause a racing or pounding heart, usually alongside shakiness, sweating, and hunger — something especially relevant for people managing diabetes.
Anemia is the other. It means your body has too few healthy red blood cells, or too little of the protein within them that carries oxygen. As the National Heart, Lung, and Blood Institute explains, the heart compensates by working harder to move oxygen, which can feel like a fast or pounding heartbeat, often with fatigue and breathlessness when you exert yourself.
Most of the causes so far come from outside the heart: something nudges an otherwise healthy heart into beating faster. Sometimes, though, the racing comes from the heart's own electrical system. These rhythm disorders are called arrhythmias, and they include atrial fibrillation, supraventricular tachycardia (often shortened to SVT), and extra beats that arrive a little early. The American Heart Association describes arrhythmias as the result of faulty electrical signals that can make your heartbeat feel very fast, irregular, or as though it is skipping or adding beats.
This is the category that genuinely calls for medical evaluation, though it helps to know that arrhythmias are common and often very treatable. Many begin without warning, even when you are resting or asleep, and they may not settle simply because you have calmed down. Some, including SVT, can occur in otherwise healthy people and are sometimes mistaken for panic attacks, since both can bring a sudden rush of fast heartbeats and lightheadedness. The Mayo Clinic Health System notes this overlap, which is a gentle reason not to brush off episodes that keep returning.
An arrhythmia is not something you can reliably identify at home, and the goal here is not to alarm you. It is simply to explain why recurring, irregular, or unexplained episodes are worth a professional's attention rather than a guess.
Anxiety and a heart rhythm problem can feel remarkably similar in the moment, but a few general patterns tend to set them apart. Baylor Scott & White Health describes anxiety-related palpitations as typically fast but regular, often tied to a stressful moment, and easing as you relax — while arrhythmia-related palpitations may feel irregular, can begin suddenly even at rest, and may not settle when you calm down. The table below lays those patterns out side by side. It is best read as a gentle guide rather than a verdict.
This table is a general guide, not a diagnosis. Anxiety and heart conditions can overlap, and a person can experience both at once. Only a healthcare professional can confirm what is behind your symptoms, so it is worth seeing a doctor whenever you are unsure or concerned.
When your heart is racing and you simply want to feel steadier, a few calm, low-risk measures may help, particularly if anxiety, dehydration, or too much caffeine seems to be behind it. Cleveland Clinic suggests options such as sitting or lying down to rest, easing into slow, deep breathing, stepping away from caffeine and other stimulants, and sipping some water. Slow breathing is worth a little extra attention, since it is free, available anywhere, and gentle on the body: many people find it helps to breathe in slowly through the nose and let the out-breath last a little longer than the in-breath, repeating that for a minute or two. It is worth thinking of these as comfort measures rather than cures — they can help you ride out a benign episode, but they are not a substitute for looking into a racing heart that keeps returning.
Noticing what was happening right before an episode — your last coffee, a missed meal, a hot room, a stressful call, how much sleep you had — can reveal a pattern over time, and it gives a doctor something concrete to work with.
Outside of the emergency signs near the top of this guide, there is a calmer, non-urgent category of reasons to have a racing heart looked at. Cleveland Clinic suggests checking in with a healthcare provider if palpitations last longer than a few minutes, keep coming back, get worse over time, or start to interfere with your daily life. Episodes that happen often, or that worry you even without dramatic symptoms, fairly belong in a conversation with a doctor too.
Reaching out is sensible rather than an overreaction. If a rhythm problem is ever a possibility, doctors have straightforward tools to look into it: an electrocardiogram (ECG) records your heart's electrical activity in just a few minutes, and the Mayo Clinic notes that a wearable monitor can be used for a day or longer to catch episodes that come and go. Often these tests bring reassurance, and when they do find something, identifying it is the first step toward feeling better.
This article is here for general information and education, and it is not medical advice. It cannot diagnose what is behind your symptoms or replace care from a qualified healthcare professional. If a racing heart, or any other symptom, is worrying you, please reach out to a doctor or other provider who can consider your full history. And if you think you may be having a medical emergency, call your local emergency number right away.
About the Author
Angela Nightingale is a Senior Editor at Daily Vitality with over two decades of experience in digital publishing and health and wellness content. She specializes in turning complex, often-confusing health topics into clear, calm, and practical guidance that respects the reader's intelligence. Her work focuses on helping people feel informed and confident — never overwhelmed or alarmed — as they make everyday decisions about how they eat, move, rest, and age.
Yes. Anxiety and panic attacks are a well-recognized cause of a racing or pounding heart, because a surge of stress hormones like adrenaline speeds the heart even when the heart itself is structurally healthy. With anxiety, the beat is usually fast but regular and tends to ease as you calm down.
Anxiety-related palpitations are often fast but steady, follow a stressful moment, and settle as you relax. Those from a rhythm problem more often begin at random, can feel irregular, and may not ease when you calm down. Because the two can overlap, only a doctor can confirm the cause.
Emergency care is warranted if a racing heart comes with chest pain or pressure, fainting or near-fainting, severe shortness of breath, severe dizziness, or a pounding heartbeat that will not stop. In those situations, the guidance is to call 911 rather than drive yourself.
A racing heart at rest or on waking often has ordinary explanations, such as caffeine or alcohol earlier in the day, dehydration, a vivid dream, or hormonal shifts, and you may simply notice it more when nothing else competes for your attention. Recurring nighttime episodes are still worth mentioning to a doctor.
Yes, both are common triggers. Caffeine is a stimulant that naturally speeds the heart, and dehydration or an electrolyte imbalance can unsettle the heart's rhythm because minerals help carry its electrical signals. Cutting back on caffeine and staying well hydrated are simple, low-risk first steps.
Most of the time, no. Occasional palpitations in otherwise healthy people are usually harmless and often pass on their own. They become more important when they are frequent, prolonged, getting worse, or paired with symptoms such as chest pain, breathlessness, dizziness, or fainting.
It can. An overactive thyroid produces extra thyroid hormone, which overstimulates the heart and can cause a fast or pounding heartbeat. It often comes with other clues, such as unexplained weight loss, feeling overly warm, shakiness, or fatigue, and a simple blood test can check your thyroid hormone levels.
Alcohol, especially in larger amounts, can trigger palpitations and is a known trigger for atrial fibrillation, a pattern sometimes called holiday heart. You might notice it during the evening or the next morning. A racing heart that repeatedly follows drinking is worth raising with a doctor.
Yes. Low blood sugar prompts a release of adrenaline that can cause a pounding heart, usually with shakiness, sweating, and hunger. Anemia, meaning too few healthy red blood cells, makes the heart work harder to move oxygen and can feel like a fast heartbeat. Both can be identified with a blood test.
Evaluation often starts with an electrocardiogram, a quick and painless recording of the heart's electrical activity. If episodes come and go, a doctor may suggest a wearable monitor worn for a day or longer. Blood tests can also check for causes such as thyroid problems or anemia.
