Yes, COVID can be linked with a slower pulse in some people, though a low resting heart rate is not always a danger sign.
A low heart rate can feel strange, especially when it shows up during an illness that most people link with cough, fever, and fatigue. Still, a slower pulse has been reported in some people with COVID, both during the acute infection and in the recovery stretch. That does not mean every low reading is a red flag. A resting pulse under 60 can be normal in runners, during sleep, or in people who naturally sit on the low side.
The real question is context. A pulse that drops and stays low while you also feel faint, short of breath, weak, or foggy is different from a quiet heart rate on a fitness watch while you feel fine. COVID can affect the heart’s electrical system, the body’s automatic nerve control, oxygen levels, body temperature response, and fluid balance. Medicines used during illness can also slow the pulse.
This article sorts out what “low heart rate” means, why COVID may be tied to it, when it can pass on its own, and when it calls for urgent care.
What Counts As A Low Heart Rate
Doctors call a slow heart rate bradycardia. The American Heart Association’s bradycardia page describes it as a heart rate that is too slow for the body’s needs, often under 60 beats per minute in adults. That number is only a starting point. A fit person may sit at 45 to 55 and feel totally normal. Another person may feel wiped out at 58 if that is a drop from their usual pattern.
What matters most is how you feel and what else is going on. If a lower pulse comes with chest pain, fainting, confusion, gray or blue lips, or air hunger, treat that as urgent. If you feel fine, the next step is less dramatic: compare the reading with your normal baseline, look at hydration, fever, meds, and timing, and check whether the number stays low or bounces back.
Can Covid Cause Low Heart Rate During Or After Infection?
Yes. It can happen, though it is not the most common heart-related issue tied to COVID. Some people develop what doctors call relative bradycardia. That means the pulse does not rise as much as expected during fever. A CDC report in Emerging Infectious Diseases described relative bradycardia in patients with mild to moderate COVID, which gave doctors one more clue about how the illness can affect the body’s usual fever response.
There are a few paths that may lead to a slower pulse. COVID can irritate the heart muscle, upset the electrical signals that control each beat, or disturb the nervous system that helps set heart rate and blood pressure. The American Heart Association scientific statement on arrhythmias and autonomic dysfunction notes that rhythm issues can happen during infection and recovery. That does not mean every slow pulse points to heart damage. It means the symptom deserves a careful read, not a shrug.
Recovery can muddy the picture. Some people feel wiped out, dehydrated, and stuck in bed for days, which can shift heart rate patterns. Others notice swings: a slow pulse at rest, then a jump when they stand or walk. Those swings can hint at autonomic trouble after the virus, especially when dizziness, brain fog, and exercise intolerance come along for the ride.
Why The Pulse May Drop
A slower heart rate during or after COVID is usually not caused by one thing alone. Here are the usual suspects:
- Inflammation that irritates the heart muscle or conduction system
- Autonomic nerve changes that alter heart-rate control
- Low oxygen or poor sleep during illness
- Dehydration, poor food intake, or low blood sugar
- Fever with an odd pulse response
- Medicines that slow the heart, such as beta blockers or some antiviral or sedative drugs
- Pre-existing rhythm problems that show up more clearly during illness
That list is why a single smartwatch number rarely tells the full story.
| Possible reason | What it may feel like | What helps sort it out |
|---|---|---|
| Relative bradycardia with fever | Fever, tiredness, pulse lower than expected | Temperature, trend over a day, exam |
| Dehydration or low intake | Weakness, dry mouth, lightheadedness | Fluids, standing symptoms, blood pressure |
| Medication effect | New low readings after taking a drug | Medication review with a clinician |
| Myocarditis or heart inflammation | Chest pain, breathlessness, fatigue | ECG, blood tests, imaging |
| Autonomic dysfunction | Dizzy on standing, pulse swings, brain fog | Orthostatic vitals, symptom pattern |
| Normal low baseline | No symptoms, common in athletes | Past readings and usual resting pulse |
| Sleep or deep rest | Low pulse at night or after lying down | Daytime recheck when awake |
| Conduction problem | Fainting, pauses, heavy fatigue | ECG, monitor, urgent assessment |
Signs That Matter More Than The Number
The number on the screen matters less than the full picture. A pulse of 52 in someone who feels calm and normal is one thing. A pulse of 52 with chest pressure and gray skin is a whole different story.
Watch for symptoms that suggest the body is not getting enough blood flow. The NHLBI page on arrhythmia symptoms lists signs such as slow or irregular heartbeat, pauses, fainting, dizziness, and shortness of breath. When those show up during COVID or soon after it, the next move is not to guess.
Red Flags That Need Prompt Care
- Chest pain or chest pressure
- Fainting or almost fainting
- New shortness of breath at rest
- Confusion, trouble staying awake, or blue lips
- A slow pulse with low blood pressure
- Palpitations, skipped beats, or long pauses
If any of those are happening, urgent medical care makes sense. If the pulse is low but you feel steady, the plan can be calmer: recheck the reading, drink fluids, review meds, and speak with a clinician if it stays low or feels new for you.
| Situation | What to do | Why |
|---|---|---|
| Low pulse, no symptoms, known low baseline | Monitor and recheck later | May be normal for you |
| Low pulse with dizziness or weakness | Call your clinician soon | May need ECG or med review |
| Low pulse with chest pain or fainting | Get urgent care now | Could signal poor blood flow or rhythm trouble |
| Pulse swings after COVID recovery | Book a medical visit | Autonomic issues may need workup |
What Doctors May Check
If a slow pulse seems tied to COVID, the workup usually starts with the basics. A clinician may check oxygen level, blood pressure, temperature, fluid status, medication list, and an ECG. If chest pain, breathlessness, or ongoing fatigue are part of the picture, blood tests and imaging may come next.
That workup is less about chasing rare causes and more about separating harmless low readings from the ones that need treatment. Some people need nothing more than fluids, rest, and time. Others may need medication changes, a heart monitor, or more follow-up if the slow pulse keeps returning.
Questions Worth Asking Yourself Before The Visit
- What is my usual resting pulse when I’m well?
- Did the low reading start during COVID or later?
- Do I feel dizzy, faint, breathless, or foggy with it?
- Am I taking any medicine that can slow the pulse?
- Is the reading low all day or only during sleep and rest?
When A Low Heart Rate May Not Be From COVID
COVID is not the only possible reason. Athletic training, thyroid disease, sleep, dehydration, aging of the heart’s wiring, and medicines can all lower the pulse. That is one reason it is easy to overread a single number after a positive test. Timing helps, though timing alone cannot prove cause.
If the low pulse started well before infection, it may just be your normal pattern. If it began during COVID and stayed with you, or if it arrives with chest symptoms or fainting, the link becomes more plausible and worth a closer check.
What You Can Do At Home
Keep it simple. Recheck the pulse when you are awake, sitting, and calm. Drink fluids. Eat if you have been skipping meals. Review your meds. Skip hard exercise if the low rate feels new or comes with chest symptoms, dizziness, or breathlessness. Write down the number, time, symptoms, temperature, and oxygen if you have a pulse oximeter. That log can make a clinic visit much more useful.
A low pulse after COVID can be short-lived. Still, if it keeps showing up, feels new for you, or comes with any red-flag symptom, get it checked rather than trying to tough it out.
References & Sources
- American Heart Association.“Bradycardia: Slow Heart Rate.”Defines bradycardia and outlines common symptoms and causes of a heart rate that is too slow.
- American Heart Association.“Cardiac Arrhythmias and Autonomic Dysfunction Associated With COVID-19.”Summarizes evidence that rhythm issues and autonomic changes can happen during COVID infection and recovery.
- National Heart, Lung, and Blood Institute.“Arrhythmias – Symptoms.”Lists common warning signs of rhythm problems, including a slow heartbeat, dizziness, fainting, and shortness of breath.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.