Learn 7 warning signs that may signal a serious heart problem, including chest discomfort, shortness of breath, unusual fatigue, dizziness, and more.
Heart problems don’t always begin with dramatic chest pain. Sometimes the warning signs are subtle, unusual, or easy to dismiss as stress, indigestion, or simply getting tired. Recognizing potentially serious symptoms early can make a critical difference.
Here are 7 warning signs that deserve attention:
1. Chest pressure, pain, or discomfort
Chest discomfort is one of the best-known warning signs of a heart attack. It may feel like pressure, squeezing, heaviness, fullness, burning, or uncomfortable tightness rather than sharp pain.
Pain or discomfort can also spread to the arm, shoulder, back, neck, jaw, or upper abdomen.
If chest discomfort is sudden, severe, persistent, or accompanied by other warning signs, seek emergency medical care.
2. Shortness of breath
Becoming unusually breathless—especially at rest or with very little activity—can be a warning sign of a heart or lung problem.
Some people may notice difficulty breathing when lying down or wake up suddenly feeling unable to catch their breath.
3. Unexplained or extreme fatigue
Feeling unusually exhausted without an obvious reason can sometimes accompany heart problems.
This may be particularly important when fatigue is new, severe, or occurs together with shortness of breath, chest discomfort, nausea, or dizziness.
4. Dizziness or fainting
A sudden episode of dizziness, lightheadedness, or fainting can occur when the brain isn’t receiving enough blood flow.
Heart rhythm problems and other cardiovascular conditions can sometimes cause these symptoms. Unexplained fainting should be medically evaluated.
5. A racing, pounding, or irregular heartbeat
Occasional awareness of your heartbeat isn’t necessarily dangerous. However, a heartbeat that suddenly becomes very fast, irregular, or pounding—particularly when accompanied by chest pain, breathlessness, dizziness, or fainting—shouldn’t be ignored.
6. Swelling in the legs, ankles, or feet
Persistent swelling can occur when the body retains excess fluid. In some cases, this can be associated with heart failure.
Swelling becomes especially concerning when it occurs alongside shortness of breath, rapid weight gain, or difficulty breathing while lying down.
7. Cold sweats, nausea, or unusual discomfort
A heart attack can sometimes cause symptoms that don’t seem obviously related to the heart, including cold sweating, nausea, vomiting, unusual weakness, or discomfort in the back, jaw, neck, or upper abdomen.
Women, older adults, and people with diabetes may be more likely to experience less typical heart-attack symptoms.
When should you seek emergency help?
Don’t wait for all seven symptoms to appear.
Call your local emergency service immediately if you have symptoms that could indicate a heart attack—particularly chest pressure/discomfort, trouble breathing, fainting, or discomfort spreading to the arm, back, neck, jaw, or stomach.
It’s much safer to have a concerning symptom checked and discover that it isn’t a heart attack than to delay treatment for a genuine emergency.
Important reminder
These symptoms do not automatically mean that your heart is in danger. Many other conditions can cause them. But new, severe, unexplained, or worsening symptoms deserve medical attention, particularly if you have cardiovascular risk factors such as high blood pressure, diabetes, high cholesterol, smoking, obesity, or a family history of heart disease.