A slow heart rate can be completely normal in some people, while in others it reflects sinus-node or conduction-system disease. Palpitations may occur at the same time, but the relationship depends on the actual heart rhythm rather than the pulse number alone.
Bradycardia means a slower-than-usual heart rate, commonly defined as fewer than 60 beats per minute in a resting adult. A slow pulse is not automatically abnormal: healthy young adults, trained athletes and people during sleep may have heart rates in the 40s or 50s without a problem. Bradycardia and palpitations can occur together when premature beats, pauses, sinus-node dysfunction, heart block or alternating slow and fast rhythms are present. The important question is whether symptoms such as dizziness, fainting, weakness, breathlessness or chest discomfort occur at the same time as the slow rhythm.
When a Slow Heart Rate Needs Urgent Attention
A low pulse number alone does not determine whether bradycardia is an emergency. What matters is whether the heart rate is causing inadequate circulation.
Seek urgent or emergency medical care for a slow heart rate associated with:
- fainting or loss of consciousness;
- severe dizziness or near-fainting;
- significant chest pain or pressure;
- severe shortness of breath;
- confusion or an acute change in mental status;
- signs of shock, such as marked weakness, pale or clammy skin or very low blood pressure;
- acute heart-failure symptoms; or
- collapse or rapidly worsening symptoms.
Emergency bradycardia management depends on the rhythm and clinical condition and may include medications or temporary cardiac pacing. These are hospital treatments rather than measures to try at home.
What Is Bradycardia?
Bradycardia means that the heart is beating more slowly than usual. In adults, a resting heart rate below 60 beats per minute is commonly described as bradycardia.
However, this definition does not mean that everyone with a pulse of 55, 50 or even lower has heart disease.
The heart’s normal rhythm usually begins in the sinus node, a group of specialized cells in the right atrium that acts as the heart’s natural pacemaker.
The electrical impulse then travels through the atria to the atrioventricular (AV) node and onward through the conduction system to activate the ventricles.
Bradycardia can occur when:
- the sinus node generates impulses more slowly;
- the sinus node pauses or fails intermittently;
- electrical impulses are delayed or blocked between the atria and ventricles;
- a medicine slows sinus-node or AV-node activity; or
- another medical condition affects cardiac electrical function.
When Can a Slow Heart Rate Be Normal?
A slow resting pulse is not always a sign of disease.
Trained athletes
Regular endurance training can make the cardiovascular system more efficient. Some well-trained athletes have resting heart rates in the 40s or 50s without dizziness, fainting, breathlessness or impaired exercise capacity.
Healthy younger adults
Some healthy people naturally have resting heart rates below 60. The rate is more reassuring when the person feels well and the ECG shows a physiological sinus rhythm.
During sleep
Heart rate normally decreases during sleep as autonomic balance changes. Nocturnal bradycardia is therefore common and does not automatically require treatment.
Medication-related slowing
Some cardiovascular medicines deliberately slow heart rate. Whether the resulting rate is acceptable depends on symptoms, the indication for treatment and the patient’s clinical condition.
A healthy athlete with a resting pulse of 48 and no symptoms may be very different clinically from an older patient with a pulse of 48, fainting episodes and heart block. Heart rate, ECG findings, symptoms and the underlying cause all matter.
How Are Bradycardia and Palpitations Related?
A palpitation is the sensation of being unusually aware of the heartbeat. It may feel like pounding, fluttering, a skipped beat, an extra beat or a pause followed by a stronger beat.
Bradycardia itself does not necessarily produce palpitations. Several rhythm patterns can explain why the two symptoms occur together.
Premature beats
PACs and PVCs may occur when the underlying heart rate is slow. A premature beat and the pause or stronger beat that follows may be experienced as a skip, thump or flutter.
Sinus pauses
Sinus-node dysfunction can cause unusually long pauses between heartbeats. Some patients notice the pause itself or the stronger beat that follows it.
Tachy-brady syndrome
Sinus-node disease can sometimes produce alternating slow and fast rhythms. Patients may notice racing palpitations during the fast phase and weakness, dizziness or pauses when the rhythm slows.
Heart block and escape rhythms
When conduction from the atria to the ventricles is impaired, slower subsidiary pacemakers may maintain the heartbeat. The resulting rhythm may be slow and occasionally irregular or accompanied by noticeable changes in heartbeat strength.
Important Correction: There Is No “50 BPM Ectopic Beat Switch”
The previous version of this page stated that when the heart rate drops below 50 beats per minute, ectopic cardiac cells become activated and start causing premature beats.
Cardiac electrophysiology is more complex. Escape pacemakers can become important when the normal pacemaker fails or conduction is blocked, but premature beats do not automatically appear at a particular heart-rate threshold. The ECG rhythm, pauses, conduction pattern and symptoms need to be assessed individually.
See our main guide to heart palpitation symptoms for more information about skipped, pounding and fluttering sensations.
What Can Cause Bradycardia With Palpitations?
Sinus-node dysfunction
Sinus-node dysfunction occurs when the heart’s natural pacemaker cannot consistently generate or transmit an appropriate rate.
Age-related fibrosis of sinus-node tissue is an important cause. Patients may develop sinus bradycardia, pauses or alternating bradycardia and atrial tachyarrhythmias.
Atrioventricular heart block
AV block occurs when electrical impulses between the atria and ventricles are delayed or fail to conduct normally.
The clinical importance differs greatly between first-degree AV block, Mobitz I, Mobitz II, high-grade block and complete heart block.
Medicines
Several medicines can slow sinus-node activity or AV conduction, including:
- beta-blockers;
- verapamil and diltiazem;
- digoxin;
- some antiarrhythmic medicines; and
- certain other prescription drugs.
If a medicine appears to be producing an excessively slow pulse, contact the prescribing clinician. The appropriate response may be dose adjustment, a different medicine or further evaluation, depending on why the treatment was prescribed.
See our medicines and heart palpitations guide for more information.
Hypothyroidism
An underactive thyroid can slow heart rate. Other symptoms may include fatigue, cold intolerance, constipation, dry skin or weight changes.
Treating confirmed hypothyroidism may improve associated bradycardia, but persistent palpitations should still be evaluated on their own merits.
Learn more about thyroid disease and heart palpitations .
Electrolyte abnormalities
Significant abnormalities of potassium, calcium and other electrolytes can interfere with cardiac electrical signaling and may cause slow, fast or otherwise abnormal rhythms.
Obstructive sleep apnea
Sleep apnea can be associated with nocturnal bradycardia and other rhythm disturbances.
Significant nighttime bradycardia together with loud snoring, witnessed pauses in breathing, choking during sleep or excessive daytime sleepiness may prompt evaluation for sleep apnea.
Nocturnal bradycardia alone does not automatically mean that a pacemaker is needed.
Heart disease or myocardial injury
Aging-related conduction-system disease, previous heart attack, myocarditis, cardiac surgery and other structural or electrical heart disorders may contribute to bradycardia.
How Do Doctors Evaluate Bradycardia and Palpitations?
The goal is not simply to confirm that the pulse is slow. The clinician needs to determine:
- what the actual rhythm is;
- whether the rhythm is physiological or abnormal;
- whether symptoms occur during the bradycardia;
- whether the conduction system is abnormal; and
- whether a reversible cause is present.
12-lead ECG
An electrocardiogram is the principal test for identifying sinus bradycardia, AV block and many other conduction abnormalities.
Ambulatory ECG monitoring
If symptoms come and go, a short office ECG may miss the relevant rhythm. A Holter, patch or event monitor can correlate palpitations, dizziness or weakness with the heart rhythm over a longer period.
In sinus-node dysfunction, current guidelines do not specify one heart-rate number or pause duration that automatically requires a pacemaker. Determining whether symptoms actually occur during bradycardia is an important part of the decision.
Blood tests
Depending on the clinical situation, testing may include thyroid function, electrolytes and other investigations for potentially reversible causes.
Medication review
Prescription medicines, over-the-counter products and supplements should be reviewed because several drugs can slow heart rate or affect conduction.
Echocardiogram
Echocardiography may be appropriate when structural heart disease or impaired heart function is suspected.
Exercise testing
Exercise testing can be useful when symptoms occur with exertion or when the clinician wants to assess whether the heart rate increases appropriately during activity.
How Is Bradycardia Treated?
Treatment depends on the cause, symptoms and ECG findings. Not every slow heart rate needs treatment.
Physiological bradycardia
A healthy, asymptomatic athlete or young adult with physiological sinus bradycardia may require no treatment at all.
Treat a reversible cause
When bradycardia results from another condition, treatment may focus on:
- confirmed hypothyroidism;
- a clinically important electrolyte abnormality;
- sleep apnea;
- myocardial ischemia or another acute illness; or
- a medication contributing to excessive slowing.
Medication-related bradycardia
A clinician may sometimes adjust the dose or choose a different medicine when a treatment is causing clinically important bradycardia.
Do not independently stop beta-blockers, calcium-channel blockers, antiarrhythmics or other prescription medicines.
Important Correction: Stable and Unstable Bradycardia Were Reversed in the Old Article
The previous version stated that “unstable bradycardia does not need drugs” while “stable bradycardia needs urgent atropine.”
This is incorrect.
Bradycardia without cardiopulmonary compromise is generally assessed for underlying causes, documented with ECG and monitored according to the clinical situation.
Bradycardia causing hypotension, acute altered mental status, shock, ischemic chest discomfort or acute heart failure requires urgent medical management. Current emergency algorithms may use atropine and, when necessary, temporary pacing or vasoactive therapy.
When Is a Pacemaker Needed for Bradycardia?
A permanent pacemaker is a small implanted device that can prevent the heart rate from falling below the programmed rate when the heart’s own electrical system cannot reliably maintain an adequate rhythm.
It is not required simply because the resting pulse falls below 60.
Sinus-node dysfunction
In sinus-node dysfunction, there is no single minimum heart rate or pause length that automatically means a pacemaker is necessary.
The decision commonly depends on establishing that clinically important symptoms such as dizziness, fainting, fatigue or exercise intolerance correlate with the bradycardia.
Advanced AV block
The situation differs for certain conduction disorders. Acquired Mobitz type II second-degree AV block, high-grade AV block and complete third-degree AV block generally require permanent pacing when they are not due to a reversible or physiological cause, even when obvious symptoms are absent.
A Pacemaker Treats the Slow-Rhythm Problem — Not Every Palpitation
If someone has both bradycardia and premature beats or another tachyarrhythmia, implanting a pacemaker does not automatically eliminate every flutter, skipped beat or racing episode.
Management depends on the complete rhythm diagnosis. In tachy-brady syndrome, for example, the slow and fast components may require different elements of treatment.
Dr. Albana’s Note
When someone tells me, “My pulse is only 50 and I feel palpitations,” I do not decide whether that is dangerous from the number alone. I want to know whether the person is athletic, what medicines they take, whether the rhythm feels regular or irregular, and whether dizziness, fainting, unusual fatigue, chest discomfort or breathlessness occurs. An ECG — and sometimes longer rhythm monitoring — can show whether the symptoms come from normal sinus bradycardia, premature beats, pauses, heart block or another rhythm.
When Should You Arrange a Medical Assessment?
Contact a healthcare professional if:
- your resting pulse is repeatedly unusually slow for you;
- you have new palpitations together with a slow pulse;
- you repeatedly feel dizzy or lightheaded;
- you have unusual fatigue or exercise intolerance;
- you experience near-fainting;
- your heartbeat alternates between very slow and very fast;
- your symptoms started after beginning or changing a medicine;
- you have known heart or conduction-system disease;
- you have a family history of conduction disorders or pacemaker implantation at a young age; or
- slow nighttime heart rates occur together with symptoms suggesting sleep apnea.
If dizziness is a major symptom, see dizziness and heart palpitations .
If unusual weakness accompanies the episodes, see heart palpitations and weakness .
Urgent Warning Signs
Seek urgent or emergency medical care for a slow heart rate or palpitations accompanied by:
- fainting or loss of consciousness;
- collapse;
- severe dizziness or near-fainting;
- significant chest pain or pressure;
- severe shortness of breath;
- confusion or an acute mental-status change;
- signs of shock or very low blood pressure;
- acute heart-failure symptoms; or
- rapidly worsening symptoms.
If chest pain accompanies the rhythm symptoms, see our chest pain and heart palpitations guide for additional education, but emergency warning signs require urgent medical assessment first.
Most Asked Questions
Can bradycardia cause heart palpitations?
Bradycardia and palpitations can occur together, but the slow rate itself is not always what produces the sensation. Premature beats, pauses, heart block or alternating slow and fast rhythms may explain the palpitations. An ECG or rhythm monitor can help identify the actual rhythm.
Is a heart rate below 60 always dangerous?
No. Healthy young adults, trained athletes and people during sleep may have resting heart rates below 60 without disease. Symptoms, ECG findings and the underlying cause are more important than the number alone.
Is a heart rate of 50 too low?
Not necessarily. A rate around 50 may be normal in a healthy, physically fit person without symptoms. The same rate may be clinically important in someone with fainting, severe dizziness, heart block, medication toxicity or another underlying problem.
Why does a slow heartbeat sometimes feel like a skipped beat?
The sensation may come from a premature beat, a pause or a stronger beat after the pause rather than from bradycardia alone. Rhythm monitoring is useful when these sensations recur.
Can hypothyroidism cause bradycardia and palpitations?
Hypothyroidism can slow the heart rate. Palpitations may coexist for several reasons, including premature beats or another rhythm problem. Treating confirmed thyroid disease may correct the slow rate, but persistent palpitations still deserve appropriate evaluation.
Can beta-blockers cause bradycardia?
Yes. Beta-blockers intentionally reduce heart rate and can sometimes cause excessive bradycardia. Do not abruptly stop a prescribed beta-blocker without medical advice; contact the prescribing clinician if your pulse becomes unusually slow or symptoms develop.
Can sleep apnea cause a slow heartbeat at night?
Sleep-disordered breathing can be associated with nocturnal bradycardia and other arrhythmias. Significant nighttime bradycardia together with snoring, witnessed breathing pauses or daytime sleepiness may warrant assessment for obstructive sleep apnea.
Does everyone with bradycardia need a pacemaker?
No. Physiological or asymptomatic sinus bradycardia often needs no pacemaker. In sinus-node dysfunction, symptom-rhythm correlation is important. Certain advanced AV blocks, however, generally require permanent pacing when no reversible cause is present.
Can a normal ECG rule out a bradycardia problem?
Not always. If pauses, heart block or rhythm changes are intermittent, the office ECG may be normal between episodes. A Holter, patch or event monitor may be needed to correlate symptoms with the rhythm.
What makes bradycardia an emergency?
The clinical condition matters more than the heart-rate number alone. Bradycardia associated with hypotension, acute confusion, signs of shock, ischemic chest discomfort or acute heart failure requires urgent treatment.
Related Heart Palpitation Guides
Medical References
- American Heart Association. Bradycardia: Slow Heart Rate. Last reviewed September 25, 2024. American Heart Association .
- American Heart Association. Adult Bradycardia With a Pulse Algorithm. 2025 CPR & ECC Guidelines. American Heart Association .
- Kusumoto FM, Schoenfeld MH, Barrett C, et al. 2018 ACC/AHA/HRS Guideline on the Evaluation and Management of Patients With Bradycardia and Cardiac Conduction Delay. Circulation. 2019. AHA / ACC / HRS .
- Glikson M, Nielsen JC, Kronborg MB, et al. 2021 ESC Guidelines on Cardiac Pacing and Cardiac Resynchronization Therapy. European Heart Journal. 2021. American College of Cardiology summary .
- American Heart Association. Symptoms, Diagnosis and Monitoring of Arrhythmia. American Heart Association .
- Mayo Clinic. Bradycardia: Symptoms and Causes. Mayo Clinic .
- Mayo Clinic. Bradycardia: Diagnosis and Treatment. Mayo Clinic .
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.