Heart disease doesn’t always knock before it enters. And some key warning signs can slip under the radar until it’s too late.
Fawad Kazi, MD, cardiologist with Hartford HealthCare’s Heart and Vascular Institute, shares seven symptoms of heart disease you should know, and when to act on them.
1. Chest pain or discomfort
Chest pain is a classic red flag sign of heart disease.
“People often describe it as a heaviness, squeezing or tightness on the left side of the chest, sometimes radiating into the shoulder or down the arm, and particularly concerning if it is provoked by physical exertion,” Dr. Kazi says. “If this pain worsens, becomes more frequent, or starts with milder exertion, it’s urgent to seek care.”
Don’t dismiss it — escalating chest pain is often a sign that the heart’s blood supply is compromised.
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2. Shortness of breath
Feeling winded after intense exercise is normal. But if breathing suddenly becomes difficult during everyday activities, your heart could be involved.
“When the heart isn’t pumping efficiently, fluid can back up into the lungs, making it hard to breathe — sometimes even when you’re lying down or during mild activities,” Dr. Kazi explains.
If you find yourself needing pillows to sleep or feeling suffocated when reclining, that demands prompt evaluation.
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3. Dizzy, light-headed or near fainting
A sudden wave of dizziness can feel harmless, especially if it passes quickly. But it could also point to an issue with how your heart is pumping or maintaining blood pressure.
“Sudden dizziness or fainting suggests a possible electrical or circulatory fault in the heart,” Dr. Kazi warns. “It could signal dangerous rhythm disturbances or drops in blood pressure.”
If this happens more than once, it’s a good idea to bring it up with your doctor.
4. Uncomfortable heart palpitations
Everyone’s heart skips a beat occasionally. But when it’s frequent, it can signal something more serious.
“Fluttering, pounding, skipped beats or racing sensations can point to underlying rhythm issues,” says Dr. Kazi. “While occasional palpitations can be harmless, persistent or worsening ones warrant evaluation.”
If the sensation keeps happening or starts to feel alarming, it’s time to talk with a doctor.
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5. Swelling in legs, ankles or abdomen
Swelling in your lower body can sometimes be a sign that your heart isn’t circulating blood as efficiently as it should.
“Fluid retention — especially in the lower limbs or midsection — can signal that the heart is failing to circulate blood properly,” Dr. Kazi states. “When swelling pairs with breathing trouble, it might mean congestive heart failure.”
If swelling appears suddenly or steadily worsens over several days, seek medical care.
6. Cramping in legs during walks
If your legs start cramping every time you walk a certain distance — then feel better after resting — it might not be a muscle problem.
“Intermittent claudication — cramping with walking — suggests narrowed arteries in the legs, which often accompanies overall cardiovascular disease,” Dr. Kazi notes.
Don’t chalk it up to aging. It may hint at blockages affecting your whole system.
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7. Fatigue, unexplained or worsening
SFeeling unusually tired day after day can sometimes be one of the earliest signs of heart disease.
“Persistent fatigue, reduced endurance or unusual tiredness with minimal exertion can be silent symptoms of heart disease in men and women,” Dr. Kazi says. “Women especially may have fatigue, jaw or back discomfort instead of classic chest pain.”
If your usual energy levels suddenly drop and there’s no clear reason, it’s worth getting evaluated.
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When to talk to your doctor
Heart disease symptoms don’t always look dramatic. Sometimes they show up as subtle changes. That’s why paying attention to these signals can help catch problems earlier, when they’re often easier to treat.
“When in doubt, prompt medical evaluation is safer than regret,” Dr. Kazi cautions. “Heart symptoms are best assessed in an emergency or specialized care setting.”
