Healthy Living
Shortness of Breath: What Could It Mean for Your Heart?
Shortness of breath, or dyspnea, is the feeling that breathing is harder than it should be. It can come on suddenly or build over time. Lung conditions are a common cause, but heart problems are also a major reason people feel breathless.
When the heart is not pumping as well as it should, or when blood flow to the heart is blocked, fluid and pressure can build up in the lungs. That makes it harder for oxygen to move into the bloodstream, so you may feel out of breath with activity, when lying flat or even at rest. Heart-related shortness of breath may:
- Show up first with everyday activities, like walking or climbing stairs.
- Wake you from sleep feeling like you cannot get enough air.
- Come with other heart symptoms such as chest discomfort, swelling in the legs or a racing heartbeat.
How Heart Problems Can Make You Short of Breath
Your heart and lungs work together to move oxygen through the body. When the heart is weak, stiff or blocked, it can no longer keep up with what your body needs. Common ways heart problems lead to shortness of breath include:
- Blood backing up into the lungs because the heart cannot pump strongly enough, causing fluid and pressure in the air spaces.
- Less blood and oxygen reaching the muscles, so even simple tasks feel tiring and make you winded.
- Very fast or irregular heart rhythms that reduce how much blood the heart pumps with each beat.
- Narrowed or leaky heart valves that force the heart to work harder and can lead to congestion in the lungs.
Heart-Related Conditions Linked to Shortness of Breath
Several heart conditions can cause or worsen shortness of breath. The pattern of your symptoms can offer useful clues.
| Heart condition | How shortness of breath often shows up | Other common clues |
| Heart failure | Breathless with activity, when lying flat or waking up suddenly at night gasping for air. | Leg or ankle swelling, weight gain, fatigue, dry cough or feeling full quickly. |
| Coronary artery disease and heart attack | Sudden or increasing shortness of breath, sometimes even without strong chest pain. | Chest pressure or discomfort, pain in the arm, neck or jaw, nausea, sweating or a sense of dread. |
| Heart valve disease | Gradually worsening breathlessness with exertion, sometimes progressing to shortness of breath at rest. | Heart valve disease Gradually worsening breathlessness with exertion, sometimes progressing to shortness of breath at rest. Heart murmur, fatigue, swelling in the legs, dizziness or fainting spells. |
| Pericardial disease or fluid around the heart | Shortness of breath that may worsen when lying down or taking a deep breath. | Chest pain that can improve when leaning forward, rapid heartbeat, fatigue and sometimes low blood pressure. |
Because these conditions can overlap and share symptoms with lung and other problems, it is important not to self-diagnose. A clinician can use your story, an exam and tests such as blood work, an electrocardiogram (ECG), imaging or an echocardiogram to sort out the cause.
When Shortness of Breath Is an Emergency
Shortness of breath can be serious, especially when it is sudden or comes with other warning signs of a heart or lung emergency. Call 911 or your local emergency number right away if you:
- Have sudden, severe shortness of breath, especially if it comes on at rest or wakes you from sleep.
- Notice shortness of breath with chest pain, pressure, tightness or discomfort in the arm, jaw, neck or back.
- Feel faint, confused or unusually weak, or notice blue or gray lips or fingertips.
- Cough up pink, frothy mucus or have a rapid, pounding or very irregular heartbeat with trouble breathing.
Do not drive yourself to the hospital. Emergency teams can begin treatment on the way, which can save time and limit damage to the heart or lungs.
Talking With Your Doctor About Shortness of Breath
If your shortness of breath is mild but keeps coming back or is slowly getting worse, schedule a visit with your doctor or a heart doctor. Before your appointment, it can help to note:
- When the shortness of breath started and how often it happens.
- What seems to trigger it — activity, lying flat, bending over or emotional stress.
- Whether it is getting better, worse or staying the same over time.
- Any other symptoms, such as chest discomfort, palpitations, swelling or cough.
- All medicines you take, including over-the-counter drugs and supplements.
Share this information with your care team and ask what your symptoms might mean for your heart, what tests they recommend and how you can protect your heart health going forward.