Exercise naturally makes your heart work harder. Your heart rate goes up, your breathing speeds and you sweat as your body keeps up with activity. Usually, that’s exactly what should happen.
But sometimes, physical activity can reveal symptoms that shouldn’t be ignored. Maybe you feel chest pressure while walking uphill. You notice shortness of breath during a workout or your heart races when you’re only mildly active.
While many exercise-related sensations are normal, some may mean your heart is under stress. Knowing the difference can help you stay safe and get help if needed.
Why exercise can trigger heart symptoms
During exercise, your body demands more from your heart. Your heart must pump faster and harder to send oxygen-rich blood to your muscles. Blood pressure increases, your breathing speeds up and your body temperature rises. These changes are normal.
But if you have an underlying problem with your heart or blood vessels, exercise can bring symptoms to the surface. Some heart issues might not cause symptoms when you're resting but can appear during physical activity.
“Feeling tired or out of breath during intense exercise is often a sign that the cardiovascular system is being challenged,” said Ojas Bansal, MD, a cardiologist at Banner Health. "But there is a difference between ‘feeling the burn’ and a medical warning. Chest pain, unusual shortness of breath, irregular heartbeat or dizziness are signals that you should not ignore.”
Heart symptoms during exercise not to ignore
Not all uncomfortable feelings during exercise are dangerous. But some symptoms need attention, especially if they suddenly come on, get worse with activity or improve when you stop moving.
Chest pain or pressure
Chest discomfort might feel like tightness, squeezing, heaviness or burning. Sometimes, the pain spreads to your arm, jaw, shoulder or back.
“This chest tightness could be angina, which happens when the heart muscle doesn’t get enough oxygen-rich blood,” Dr. Bansal said. “Angina often shows up during physical activity or stress and usually gets better with rest.”
Even mild or brief chest pressure should lead you to talk with your health care provider.
Shortness of breath
Breathing harder during activity is normal. Your muscles need oxygen and your lungs help provide it. But if you suddenly feel short of breath, especially during light activity, it could be a warning sign. You might get winded faster than usual or find it hard to speak while moving.
“If you notice you're out of breath more than you should be for your activity, don’t ignore it,” Dr. Bansal said. “Even healthy people can have heart problems that first show up when they exercise."
Heart palpitations
It’s normal for your heart to beat faster when you exercise or are stressed. But if your heart flutters, skips beats, pounds or suddenly races, it could be a sign of an irregular heartbeat. If these palpitations happen often or come with dizziness, chest pain or fatigue, you should be evaluated.
Dizziness or lightheadedness
Some light dizziness after intense activity is normal. But feeling faint, blurry or unsteady during exercise can be dangerous and should be discussed with your health care provider.
Excessive fatigue
Fatigue is normal when you exercise but if you suddenly feel very tired during mild or moderate activity, it could mean a heart problem. You might feel drained, unusually weak or find it hard to do things that used to be easy. Feeling tired along with shortness of breath, palpitations or chest pain can be early signs of heart disease.
Sweating
Sweating is your body’s natural way of cooling itself during exercise. How much you sweat depends on how hard you're working out, the weather, and how hydrated and fit you are.
"If you feel cold, clammy or start sweating suddenly without doing heavy activity and you also have chest pain or nausea, it could be a sign of heart trouble or a heart attack,” Dr. Bansal said.
Possible heart-related causes of symptoms during exercise
Certain heart conditions can make symptoms appear during physical activity, even if you feel fine at rest. These include:
- Coronary artery disease (CAD): Narrow arteries can reduce blood flow to the heart, causing chest pain or pressure (angina) during activity.
- Arrhythmias: Irregular heart rhythms, like atrial fibrillation or supraventricular tachycardia, can lead to palpitations, dizziness or fainting.
- Heart valve problems: Stenosis or regurgitation can block blood flow, causing trouble breathing, tiredness or swelling.
- Heart muscle disease (cardiomyopathy):The heart might not pump well, leading to tiredness, shortness of breath or exercise intolerance.
- Blood pressure changes: High or low blood pressure during activity can cause dizziness or weakness.
Other causes that feel similar
Heart symptoms during exercise are not always caused by heart disease. Several other conditions can create similar sensations.
Common causes include:
- Deconditioning: If you’re starting a new routine or returning after a long break, your body may just need time to adjust.
- Dehydration or electrolyte imbalance: Sweating can cause fluid and mineral loss, which might lead to dizziness or fatigue.
- Lung conditions: Asthma or other breathing issues can cause shortness of breath during activity.
- Medication side effects: Some medications impact heart rate or blood pressure, altering how your body responds to exercise.
- Heat-related illness: Hot weather and humidity can challenge your body during physical activity.
Even though these causes are often less serious, it’s important to talk about them with your provider.
When to talk to a health care provider
Don't panic if you notice symptoms during exercise but pay attention to patterns.
Talk with a health care provider if you notice:
- Symptoms that appear consistently during activity
- Exercise is becoming harder than it used to be
- Chest discomfort that improves with rest
- Unexplained shortness of breath
- New palpitations during workouts
A provider may recommend tests to evaluate how your heart responds to physical stress. These might include:
- An exercise stress test
- Heart rhythm monitoring
- Imaging tests of the heart
When to seek emergency care
Stop exercising, call 911 or seek urgent medical care if you experience:
- Chest pain that does not go away
- Severe shortness of breath
- Fainting or near fainting
- Pain radiating to the arm, jaw, shoulder or back
- Nausea or cold, clammy sweat with chest discomfort
Bottom line
Exercise should challenge your body but it shouldn’t cause alarming symptoms. Chest discomfort, unusual shortness of breath, palpitations, dizziness or concerning sweating may indicate your heart is under stress.
If you notice concerning symptoms during exercise, a cardiology specialist can help determine what’s happening and guide you toward the right care for your heart. Early evaluation can help you stay active safely and prevent serious complications.
