Heart Palpitations: Causes, Symptoms and When to Worry

Have you ever felt your heart suddenly racing, pounding, fluttering, or skipping a beat? This sensation is known as heart palpitations. It can happen during exercise, periods of stress, after consuming caffeine, or even while you are resting.

Heart palpitations are common and are often harmless. However, repeated episodes or palpitations accompanied by other symptoms may indicate a medical condition that needs attention.

Understanding the possible causes, recognising warning signs, and knowing when to seek medical help can help you make informed decisions about your heart health.

What Are Heart Palpitations?

Heart palpitations are sensations that make you unusually aware of your heartbeat. You might notice them in your chest, neck, or throat.

During an episode, your heartbeat may feel like it is:

• Racing or beating unusually fast
• Pounding or thumping strongly
• Fluttering in your chest
• Skipping a beat or adding an extra beat
• Beating irregularly
• Suddenly speeding up or slowing down

Palpitations can last a few seconds, several minutes, or sometimes longer. They may occur during physical activity, emotional stress, or periods of rest.

Palpitations describe a sensation rather than a specific diagnosis. Some people experience them while their heart rhythm is normal, whereas others may have an abnormal rhythm called an arrhythmia.

What Causes Heart Palpitations?

There is no single cause of heart palpitations. They can result from everyday triggers, medication effects, changes in the body’s normal functioning, or an underlying medical condition.

1. Stress and Anxiety

Stress, nervousness, fear, and anxiety can activate the body’s stress response, increasing awareness of your heartbeat and sometimes making it beat faster.

Some people notice palpitations during a stressful event, while others experience them during periods of ongoing anxiety.

Although anxiety can contribute to palpitations, you should not automatically assume that anxiety is the cause, particularly if symptoms are new, persistent, or associated with other warning signs.

2. Caffeine and Stimulants

Caffeine affects people differently. Coffee, tea, energy drinks, and other caffeinated products may trigger palpitations in some individuals, especially when consumed in large amounts.

Nicotine and certain stimulant substances can also affect heart rate and rhythm.

If you notice a connection between a particular drink or product and your symptoms, consider reducing exposure to that trigger and discuss recurring symptoms with a healthcare professional.

3. Lack of Sleep and Physical Exertion

Insufficient sleep, strenuous exercise, and physical exhaustion can make your heartbeat more noticeable or contribute to episodes of palpitations.

A faster heartbeat during exercise is a normal response to increased physical demand. However, palpitations that are disproportionate to the activity, repeatedly occur during exertion, or come with chest discomfort, dizziness, or unusual breathlessness deserve medical assessment.

4. Dehydration and Electrolyte Imbalances

Dehydration can affect circulation and contribute to a faster heartbeat. Electrolytes, including potassium and magnesium, help regulate normal electrical activity in the body.

Significant electrolyte abnormalities may contribute to abnormal heart rhythms. A clinician can determine whether testing is necessary; do not start electrolyte supplements or high-dose minerals without appropriate advice.

5. Medicines and Supplements

Some prescription and over-the-counter products may cause palpitations in certain people. Examples include some cold and decongestant medicines, asthma treatments, thyroid medicines, and stimulant-containing products.

Tell your healthcare professional about all medicines, supplements, and herbal products you use.

Do not stop a prescribed medicine or change its dose on your own. If palpitations begin after starting or changing a medicine, ask the prescribing clinician or pharmacist whether it could be contributing.

6. Anaemia or Thyroid Problems

Iron-deficiency anaemia can reduce the blood’s ability to carry oxygen, sometimes leading to a faster heartbeat or palpitations.

An overactive thyroid can also increase heart rate and contribute to rhythm disturbances. Depending on your symptoms and medical history, a clinician may recommend blood tests to investigate these possibilities.

7. Abnormal Heart Rhythms

An arrhythmia occurs when the heart beats too quickly, too slowly, or irregularly. Some arrhythmias cause noticeable palpitations, while others may cause few symptoms.

Examples include:

• Atrial fibrillation: An irregular heart rhythm that can increase the risk of blood clots and stroke.
• Supraventricular tachycardia (SVT): Episodes of an unusually fast heart rhythm that begin above the heart’s lower chambers.
• Premature beats: Early heartbeats that can feel like a skipped beat, a pause, or an extra thump.

Not every palpitation indicates an arrhythmia. Medical assessment and, when needed, heart rhythm monitoring can help identify the cause.

What Are the Symptoms of Heart Palpitations?

The main symptom is an unusual awareness of your heartbeat. However, the experience varies from person to person.

You may notice:

• A fast or racing heartbeat
• A fluttering sensation in the chest
• Strong or forceful heartbeats
• A feeling that your heart has skipped a beat
• An irregular heartbeat
• Episodes that begin and end suddenly

Some people experience palpitations without any other symptoms. Others may also notice dizziness, tiredness, breathlessness, or chest discomfort.

Palpitations accompanied by chest pain, severe breathlessness, fainting, or feeling close to fainting need urgent medical attention.

When Should You Worry About Heart Palpitations?

An occasional, brief episode without other symptoms is often not caused by a serious condition. However, certain patterns should not be ignored.

Warning Signs That Need Medical Assessment

Arrange a medical appointment if:

• Palpitations keep returning or are becoming more frequent.
• Episodes last longer than usual or continue for several minutes.
• Your heartbeat repeatedly feels irregular.
• You develop palpitations after starting a new medicine.
• You have a known heart condition or a family history of significant heart problems.
• Palpitations occur during physical exertion or interfere with everyday activities.

These signs do not automatically mean you have heart disease, but they may justify further evaluation.

When Is It an Emergency?

Seek emergency medical help immediately if palpitations are ongoing and accompanied by any of the following:

• Chest pain, pressure, or tightness
• Severe or sudden difficulty breathing
• Fainting or feeling as though you may faint
• Severe dizziness or sudden collapse

If you are in India, call 112 for emergency assistance. Do not drive yourself if you suspect a serious cardiac emergency.

If an episode with concerning symptoms has stopped, you should still seek urgent medical advice. Do not dismiss it simply because you feel better now.

Heart Palpitations at Night: Why Do They Happen?

Some people notice their heartbeat more clearly at bedtime or when lying quietly in bed. With fewer distractions, normal changes in the heartbeat can become more noticeable.

Possible contributing factors include:

• Stress or anxiety after a busy day
• Caffeine consumed later in the day
• Insufficient sleep
• Alcohol or nicotine exposure
• Certain medicines
• An underlying heart rhythm or other medical condition

Palpitations at night do not necessarily mean that your heart is in danger. However, repeated episodes, prolonged racing, or symptoms associated with chest pain, breathlessness, or faintness should be assessed.

If you regularly wake up with a racing heartbeat, record when the episodes occur and discuss them with a healthcare professional.

Heart Palpitations and Anxiety: How Are They Connected?

Anxiety can trigger the body’s fight-or-flight response, releasing stress hormones that may increase your heart rate. The resulting sensation can feel frightening, which may increase anxiety and make the heartbeat even more noticeable.

This can create a cycle in which anxiety and palpitations reinforce one another.

However, anxiety is only one possible explanation. Arrhythmias, thyroid disorders, anaemia, medication effects, and other conditions can cause similar symptoms.

If a clinician has assessed your symptoms and identified anxiety as a contributing factor, helpful strategies may include:

• Maintaining a regular sleep schedule
• Reducing caffeine if it triggers symptoms
• Practising relaxation or slow, comfortable breathing
• Taking regular breaks during stressful periods
• Seeking professional support when anxiety affects daily life

Do not use relaxation techniques as a substitute for emergency care when serious warning signs are present.

How Are Heart Palpitations Diagnosed?

A healthcare professional will generally begin by asking about your symptoms, medical history, lifestyle, and medicines. You may be asked how often the episodes occur, how long they last, whether they begin suddenly, and what you are doing when they start.

Depending on the findings, investigations may include the following.

1. Electrocardiogram (ECG)

An ECG records the heart’s electrical activity. It may identify an abnormal rhythm or other electrical findings that help guide further evaluation.

Because palpitations can come and go, a normal ECG recorded between episodes does not always explain the symptoms.

2. Holter Monitor or Event Monitor

A Holter monitor records heart rhythm continuously over a period, often 24–48 hours. An event monitor or another wearable monitor may be used for longer when episodes happen less frequently.

These devices can help clinicians match a person’s symptoms with the recorded heart rhythm.

3. Blood Tests

Depending on your symptoms, a clinician may recommend tests to check for anaemia, thyroid abnormalities, or electrolyte disturbances. Other blood tests may be appropriate based on your medical history.

4. Echocardiogram

An echocardiogram uses ultrasound to assess the heart’s structure, valves, and pumping function. It may be recommended when examination findings, symptoms, or other tests suggest a need to assess the heart’s structure.

5. Additional Heart Tests

In selected cases, an exercise stress test or specialist assessment may be appropriate, particularly when palpitations occur during exertion or a specific rhythm disorder is suspected.

You may not need every test. The appropriate investigation depends on your individual circumstances.

How Can You Reduce Heart Palpitations?

The most effective approach depends on the cause. If palpitations are linked to a lifestyle trigger, some practical changes may help reduce episodes.

Identify Your Triggers

Keep a record of when palpitations occur, how long they last, and what you were doing beforehand. Note caffeine intake, sleep, stress, physical activity, and any medicine changes.

Maintain Consistent Sleep

Try to follow a regular sleep schedule and allow adequate time for rest. Poor sleep can contribute to palpitations in some people.

Review Caffeine and Nicotine

If you notice a connection between palpitations and caffeine or nicotine, reducing or avoiding the trigger may help. Avoid recreational stimulant substances.

Stay Hydrated

Drink fluids regularly unless a clinician has advised you to restrict fluids because of a medical condition.

Manage Stress

Relaxation exercises, mindfulness, and suitable physical activity may help when stress contributes to symptoms. Ask your clinician what level of activity is appropriate if you have known heart disease or palpitations during exercise.

Review Your Medicines With a Clinician

Ask whether any medicines or supplements could be contributing to your symptoms. Do not independently discontinue prescribed treatment.

If palpitations are caused by an underlying heart rhythm disorder or another medical condition, lifestyle changes alone may not be sufficient.

How Are Heart Palpitations Treated?

Treatment depends on what is causing the palpitations.

Some people do not require specific treatment beyond identifying and avoiding triggers. Others may need treatment for an underlying problem, such as anaemia or a thyroid disorder.

When an arrhythmia is diagnosed, management may involve monitoring, medicines, or a procedure such as catheter ablation, depending on the type of rhythm disturbance and the person’s overall health.

Do not take heart-rate medicines or other cardiac medication without a clinician’s recommendation. Treatment should be based on the identified cause rather than the sensation alone.

Frequently Asked Questions

Are heart palpitations dangerous?

Many episodes are harmless, particularly when they are brief and occur without other symptoms. However, palpitations can sometimes indicate an arrhythmia or another medical condition. Recurrent, worsening, or prolonged episodes should be assessed.

Why does my heart suddenly race for a few seconds?

Brief episodes may be associated with stress, caffeine, physical exertion, or premature heartbeats. An abnormal rhythm is another possibility. If episodes recur, become prolonged, or occur with other symptoms, seek medical assessment.

Can dehydration cause heart palpitations?

Yes. Dehydration can contribute to a faster heartbeat, and significant fluid or electrolyte disturbances may affect heart rhythm. Persistent symptoms or signs of significant dehydration require medical advice.

Can heart palpitations be caused by low iron?

Iron-deficiency anaemia can cause a faster heartbeat or palpitations. A blood test can help determine whether anaemia is present, and treatment depends on the underlying cause.

Why do I feel palpitations when lying down?

You may notice your heartbeat more when you are resting because there are fewer distractions. Position, stress, caffeine, and medical conditions can also play a role. Repeated or concerning symptoms should be evaluated.

Should I see a cardiologist for heart palpitations?

A general physician can assess many cases and decide whether you need an ECG, monitoring, blood tests, or referral to a cardiologist. Specialist assessment may be appropriate for recurrent symptoms, suspected arrhythmias, known heart disease, or abnormal test findings.

Can heart palpitations go away on their own?

Yes. Palpitations caused by temporary triggers may settle without specific treatment. However, improvement does not rule out an underlying problem, particularly if episodes recur or come with warning signs.

Conclusion

Heart palpitations can feel like a racing, pounding, fluttering, or skipped heartbeat. Common triggers include stress, caffeine, lack of sleep, physical exertion, and certain medicines, but palpitations can also be associated with anaemia, thyroid problems, or an abnormal heart rhythm.

Pay attention to how often the episodes occur, how long they last, and whether other symptoms appear. Recurring or worsening palpitations deserve medical assessment, while palpitations accompanied by chest pain, severe breathlessness, or fainting require emergency attention.

Understanding the cause is the best way to determine whether you need reassurance, lifestyle changes, further testing, or treatment.

NHS — Heart Palpitations