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Updated on March 10, 2026
Heart disease remains one of the leading causes of death worldwide. According to the World Health Organization, cardiovascular diseases claim nearly 18 million lives each year, and heart attacks account for a large portion of these deaths.
While heart attacks often appear sudden, many patients report experiencing early warning signs weeks or even months before the event occurs. These symptoms are sometimes subtle and easy to ignore, but recognizing them early may help people seek medical attention sooner.
The image above highlights swelling in one foot compared to the other, which may suggest poor circulation or fluid retention — one possible sign that the heart is struggling to pump blood effectively.
Below are seven warning signs that may appear before a heart attack, along with medical explanations and scientific insights.
1. Swelling in the Feet and Ankles
One visible warning sign of heart problems is swelling in the lower limbs, also known as edema.
When the heart becomes weaker and cannot pump blood efficiently, blood flow may slow down in the veins. This can cause fluid to accumulate in tissues, especially in the feet and ankles.
Common symptoms include:
Puffy or swollen feet
Shoes suddenly feeling tighter than usual
Skin that appears stretched or shiny
Doctors often associate this symptom with congestive heart failure, a condition in which the heart cannot pump enough blood to meet the body’s needs.
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