Most heart palpitations are not dangerous. But how long they last, how often they return, what you are doing when they happen and whether symptoms such as chest pain, breathlessness, dizziness or fainting occur can change how urgently they should be evaluated.
An occasional brief skipped, fluttering or forceful heartbeat without other symptoms is often not an emergency. You should arrange medical evaluation when palpitations keep returning, become more frequent, last longer than a few minutes, affect your daily life, occur during exercise or happen in someone with known heart disease or a concerning family history. Seek urgent or emergency medical care when ongoing palpitations occur with chest pain or pressure, severe shortness of breath, fainting, near-fainting, severe dizziness, collapse or other rapidly worsening symptoms.
How Worried Should You Be About Heart Palpitations?
I find it more useful to think about palpitations in levels of concern rather than labeling every episode “normal” or “dangerous.”
The sensation alone usually cannot tell us which heart rhythm is occurring. The context around the symptom is what changes the level of concern.
Level 1 — Often Less Concerning
A brief isolated thump, skipped beat or flutter that lasts only seconds, occurs infrequently and is not accompanied by chest pain, breathlessness, dizziness or fainting is often less concerning.
Level 2 — Make a Medical Appointment
Arrange evaluation when palpitations keep returning, are becoming more frequent, last longer than a few minutes, disturb sleep or daily activities, or occur in someone with known heart disease.
Level 3 — Seek Prompt Assessment
New palpitations associated with significant dizziness, breathlessness, exercise intolerance, unusual weakness or a major change from your usual pattern deserve more prompt medical assessment even if the symptoms have already stopped.
Level 4 — Emergency Symptoms
Ongoing palpitations with chest pain or pressure, severe shortness of breath, fainting, near-fainting, severe dizziness, collapse or rapidly worsening symptoms require urgent or emergency medical care.
When Are Heart Palpitations Often Less Concerning?
Many people occasionally notice an extra beat, skipped sensation or brief flutter.
Palpitations tend to be more reassuring when they:
- last only a few seconds;
- occur infrequently;
- are isolated rather than sustained;
- have an obvious temporary trigger;
- stop when the trigger resolves;
- occur without chest pain;
- occur without significant shortness of breath;
- occur without dizziness or fainting; and
- do not reduce your ability to exercise or perform normal activities.
Common temporary triggers can include:
- stress or anxiety;
- lack of sleep;
- strenuous exercise;
- excess caffeine;
- nicotine;
- alcohol;
- fever;
- dehydration; and
- certain medicines or stimulants.
Symptoms alone cannot confirm the rhythm. Even benign premature beats and genuine arrhythmias can sometimes feel similar. If the episodes keep returning or change from your usual pattern, medical evaluation becomes more useful.
Read our main guide to heart palpitation symptoms for the different sensations people describe.
When Should You See a Doctor for Heart Palpitations?
Arrange a medical appointment if your palpitations:
- keep coming back;
- are happening more frequently;
- last longer than a few minutes repeatedly;
- feel persistently fast or irregular;
- have changed noticeably from your previous pattern;
- occur regularly while you are resting;
- repeatedly wake you from sleep;
- occur during exercise;
- are associated with unusual fatigue or weakness;
- are reducing your exercise tolerance;
- began after starting or changing a medicine or supplement;
- occur in someone with known heart disease; or
- are affecting your quality of life.
Recurrent symptoms are often easier to evaluate before they become disruptive. The purpose of an appointment is not to assume something serious is wrong, but to determine what rhythm is occurring and whether another medical condition is contributing.
For repeated symptoms, see our dedicated guide to constant and frequent heart palpitations .
What Makes Heart Palpitations More Concerning?
Certain features increase the importance of getting the symptoms assessed.
Palpitations during exercise
Exercise normally increases heart rate, but recurrent sudden racing, marked irregularity or palpitations associated with dizziness, chest pain or fainting during exertion deserve particular attention.
Fainting or near-fainting
An arrhythmia that significantly reduces blood flow to the brain can cause lightheadedness, near-fainting or loss of consciousness. This combination deserves prompt or emergency evaluation depending on severity and whether symptoms are ongoing.
Shortness of breath
Breathlessness may occur when a rhythm interferes with efficient cardiac output, although heart failure, anemia, pulmonary disease and other conditions can produce the same combination.
Chest pain or pressure
Palpitations with significant chest discomfort should not be assumed to represent anxiety or harmless premature beats. Acute coronary syndromes and other serious conditions may present this way.
Known heart disease
Palpitations deserve more attention in someone with previous heart attack, heart failure, cardiomyopathy, significant valve disease, congenital heart disease or a previously diagnosed arrhythmia.
Concerning family history
Tell your clinician if a parent, sibling or child has an inherited rhythm disorder, cardiomyopathy or unexplained sudden cardiac death. Family history can change which tests are appropriate.
A sustained fast or irregular rhythm
A palpitation lasting minutes to hours deserves more attention than one isolated extra beat, particularly when the rhythm remains very fast, irregular or produces other symptoms.
New symptoms or a major change
A sudden change from your usual heartbeat sensations — especially when accompanied by dizziness, breathlessness, weakness or exercise intolerance — is a reason to seek medical evaluation.
Are Palpitations During Exercise More Serious?
Not every palpitation during exercise is dangerous.
Exercise normally increases heart rate, and premature beats can sometimes be noticed during activity or recovery.
However, exercise-associated palpitations deserve more attention when they are recurrent or occur with:
- fainting or near-fainting;
- significant dizziness;
- chest pain;
- disproportionate shortness of breath;
- a sustained rapid rhythm;
- known structural heart disease; or
- a concerning family history.
See our dedicated guide to heart palpitations after exercise .
When Are Heart Palpitations an Emergency?
Seek Emergency Medical Care for Ongoing Palpitations With:
- chest pain, pressure, squeezing or significant tightness;
- severe or sudden shortness of breath;
- fainting or loss of consciousness;
- collapse;
- severe dizziness or near-fainting;
- a sustained very rapid or markedly irregular heartbeat while feeling seriously unwell;
- cold sweating with significant chest discomfort;
- confusion or signs of shock;
- sudden severe weakness; or
- rapidly worsening symptoms.
If these symptoms are happening now, do not delay emergency evaluation while trying hydration, breathing exercises, supplements or other home remedies.
If significant chest discomfort is present, see our chest pain and heart palpitations article for further education, but emergency care comes first.
If difficulty breathing accompanies the rhythm symptoms, see heart palpitations and shortness of breath .
What If the Warning Symptoms Have Already Stopped?
Do not automatically ignore them simply because the episode ended.
If palpitations were accompanied by significant chest discomfort, fainting, near-fainting, substantial shortness of breath or severe dizziness and the episode has now resolved, contact an appropriate urgent medical service for advice and assessment.
Intermittent arrhythmias can disappear before an ECG is performed, so the fact that you feel normal again does not always establish that the episode was harmless.
Does Having Palpitations Mean You Have Heart Disease?
No.
Palpitations can occur for many reasons, and many are not caused by dangerous heart disease.
Often non-dangerous triggers
Stress, lack of sleep, exercise, caffeine, nicotine, alcohol, fever, dehydration and some medicines can increase heartbeat awareness or trigger premature beats.
Premature beats
PACs and PVCs can feel like skipped beats, pauses or forceful thumps. Occasional premature beats are common, although very frequent ectopy may deserve additional evaluation.
Medical conditions outside the heart
Anemia, thyroid disease, electrolyte abnormalities, pregnancy, infection and other medical conditions may cause or contribute to palpitations.
Arrhythmias
Atrial fibrillation, SVT, atrial flutter, ventricular arrhythmias and other electrical disorders may produce palpitations. The actual rhythm must be documented to know what is happening.
See our complete causes of heart palpitations guide for more detail.
Important: Do Not Judge Seriousness by How Strong the Palpitation Feels
A forceful thump can come from a benign premature beat, while some clinically important arrhythmias may cause surprisingly mild symptoms or no symptoms at all.
Intensity of sensation does not reliably measure medical danger. The rhythm, duration, associated symptoms, heart history and overall clinical context are more useful.
What Does a Dangerous Arrhythmia Feel Like?
There is no single sensation that identifies a dangerous rhythm.
Arrhythmias can feel like:
- rapid racing;
- fluttering;
- pounding;
- skipped beats;
- a slow heartbeat;
- an irregular heartbeat; or
- alternating fast and slow beats.
More concerning symptoms arise when the rhythm interferes with circulation or when it occurs in a higher-risk cardiac context.
These may include:
- fainting;
- near-fainting;
- shortness of breath;
- significant dizziness;
- chest pain or pressure;
- marked weakness; or
- collapse.
Atrial Fibrillation Is One Important Example
AF may cause racing or irregular palpitations, shortness of breath, weakness or dizziness, but some people experience very mild symptoms or none at all.
This is one reason the sensation itself cannot tell you whether the underlying rhythm is important.
What Should You Pay Attention to During an Episode?
If you are otherwise stable, several details can make later medical evaluation much more useful.
- What time did the episode start?
- How long did it last?
- Did it begin suddenly or gradually?
- Did it stop suddenly or gradually?
- Did the pulse feel regular or irregular?
- Was the heartbeat fast, slow or simply unusually forceful?
- Were you exercising, resting, eating or lying down?
- Had you used caffeine, alcohol, nicotine or a stimulant medicine?
- Was there chest discomfort, breathlessness, dizziness or weakness?
- Did you feel as if you might faint?
If you use a wearable device capable of recording an ECG and can safely capture the episode, that recording may sometimes provide useful information to your clinician.
A smartwatch result should not be used to rule out an emergency when serious symptoms are present.
How Do Doctors Find Out Whether Palpitations Are Serious?
The first goal is to identify the rhythm and look for underlying medical or structural causes.
History and examination
Your clinician may review:
- symptom frequency and duration;
- exercise association;
- medications and supplements;
- caffeine, alcohol and nicotine use;
- previous heart disease;
- thyroid or other medical conditions; and
- family history of inherited heart disease or unexplained sudden death.
12-lead ECG
An ECG records the heart’s electrical activity and can identify many rhythm and conduction abnormalities.
A short ECG only records the rhythm during that brief period. If palpitations come and go, ambulatory monitoring may be needed to capture the rhythm during an actual symptom.
Holter, patch or event monitoring
The type of monitor is usually matched to how often symptoms occur. Daily symptoms may be captured with short-term continuous monitoring, while less frequent events may require longer monitoring.
Blood tests
Depending on the history, clinicians may look for:
- anemia;
- thyroid dysfunction;
- electrolyte abnormalities; and
- other medical conditions suggested by the symptoms.
Echocardiogram
An echocardiogram may be useful when structural heart disease, valve disease, cardiomyopathy or impaired heart function is suspected.
Exercise testing
Exercise testing or rhythm monitoring during activity may be considered when symptoms consistently occur with exertion.
Can Anxiety Cause Palpitations That Feel Dangerous?
Yes. Anxiety and panic can produce powerful physical symptoms including racing heartbeat, pounding, chest tightness, rapid breathing, dizziness and an intense sense that something is wrong.
However, symptoms should not automatically be diagnosed as anxiety merely because someone is anxious.
New or changing palpitations should be considered in their complete clinical context, especially when there are cardiovascular warning signs.
Learn more in our guide to anxiety and heart palpitations .
Dr. Albana’s Note
When a patient asks me, “Should I worry about these palpitations?” I do not answer from the strength of the heartbeat sensation alone. I ask how long the episode lasts, whether it is becoming more frequent, whether it happens during exercise and whether there is chest discomfort, breathlessness, dizziness, weakness or fainting. I also want to know about heart disease, medications and family history. One occasional skipped beat in an otherwise well person is very different from a sustained rhythm associated with near-fainting. When the episodes recur, recording the rhythm gives us much more useful information than trying to judge danger from the sensation alone.
When Should You Not Wait for a Routine Appointment?
Seek more prompt medical advice when:
- your palpitations have changed substantially from your usual pattern;
- episodes suddenly begin lasting much longer;
- you develop new breathlessness;
- you develop recurrent significant dizziness or near-fainting;
- your exercise tolerance has noticeably declined;
- the episodes occur during exertion;
- you have newly diagnosed heart disease;
- you have a concerning family history; or
- you experienced serious associated symptoms that have now stopped.
The appropriate level of urgency depends on the complete clinical situation. When in doubt about significant new symptoms, seek medical advice rather than repeatedly assuming they are harmless.
Most Asked Questions
When should I worry about heart palpitations?
Palpitations deserve medical attention when they keep returning, become more frequent, last longer than a few minutes, occur during exercise or are associated with symptoms such as breathlessness, significant dizziness, weakness, chest discomfort or fainting.
How do I know if my heart palpitations are dangerous?
You usually cannot determine this from the sensation alone. More concerning features include sustained symptoms, fainting or near-fainting, chest pain, severe shortness of breath, severe dizziness, known heart disease and a concerning family history.
Are occasional skipped heartbeats normal?
Occasional premature beats are common and often benign. If skipped beats become very frequent, change substantially, produce other symptoms or occur in someone with heart disease, they may deserve further evaluation.
How long is too long for heart palpitations?
There is no single duration that determines whether a rhythm is dangerous. An isolated sensation lasting a few seconds is generally less concerning than a sustained episode. Palpitations lasting several minutes or longer repeatedly should be medically assessed, especially when they are new or accompanied by other symptoms.
Are heart palpitations dangerous if they happen every day?
Daily palpitations are not automatically dangerous, but their frequency makes rhythm documentation worthwhile. A Holter or other ambulatory ECG monitor may help determine whether the symptoms correspond to premature beats, an arrhythmia or a normal rhythm.
Should I worry about palpitations while resting?
Palpitations can occur at rest for benign reasons, including increased heartbeat awareness or premature beats. Recurrent, sustained or markedly irregular symptoms should still be evaluated, particularly when other warning signs are present.
Are palpitations during exercise dangerous?
Not necessarily, but exercise-associated palpitations deserve more attention when they are recurrent or occur with fainting, near-fainting, chest pain, marked dizziness or disproportionate shortness of breath.
Should I go to the emergency room for heart palpitations?
Seek emergency care when ongoing palpitations occur with significant chest pain or pressure, severe shortness of breath, fainting, near-fainting, severe dizziness, collapse or rapidly worsening symptoms.
Can anxiety cause heart palpitations?
Yes. Anxiety can increase heart rate and heartbeat awareness and can make premature beats more noticeable. New or persistent palpitations should not automatically be attributed to anxiety without considering other relevant causes.
Can a normal ECG mean my palpitations are harmless?
Not necessarily. If the palpitation did not occur during the ECG, an intermittent rhythm problem can be missed. Longer ambulatory monitoring may be useful when symptoms recur.
Can heart palpitations be serious without severe symptoms?
Yes, occasionally. Some arrhythmias cause mild symptoms or no symptoms. Risk depends on the rhythm, underlying heart disease and other clinical factors rather than symptom intensity alone.
Should I worry if heart palpitations suddenly feel different?
A significant change from your usual pattern deserves attention, particularly if episodes are longer, more frequent, occur with exercise or are accompanied by dizziness, breathlessness, weakness or chest discomfort.
Related Heart Palpitation Guides
Medical References
- American Heart Association. How Serious Are Heart Palpitations? Causes, Symptoms and When to Worry. Published February 9, 2026.
- American Heart Association. Symptoms, Diagnosis and Monitoring of Arrhythmia. Reviewed 2024.
- American Heart Association. Key Patient Messages: 2023 Atrial Fibrillation Clinical Practice Guideline.
- American Heart Association / American College of Cardiology. 2025 Acute Coronary Syndromes Guideline — Key Patient Messages.
- NHS. Heart Palpitations. Last reviewed March 17, 2026.
- NHS. Heart Rhythm Problems — Arrhythmia.
- Mayo Clinic. Heart Palpitations — Symptoms and Causes.
- Mayo Clinic. Heart Palpitations — Diagnosis and Treatment.
About the Medical Team
Dr. Albana Greca, MBBS, MMedSc
Family Physician / General Practitioner
Dr. Albana Greca has more than 20 years of experience in primary care, general medicine, chronic disease management, prevention, patient education and digital health.
Dr. Benard Shehu, MBBS, MS
Cardiologist
Dr. Benard Shehu has more than 19 years of cardiovascular experience, including clinical experience relevant to arrhythmias and cardiovascular disease.