When the thermometer soars into triple digits, the impact goes beyond just feeling uncomfortable. Extreme heat puts added stress on the cardiovascular system as it works harder to keep the body cool, and that extra demand can be especially dangerous for people with heart conditions.

Why Hot Weather Strains Your Cardiovascular System

The body’s response to heat involves blood vessel dilation and sweating to cool down—mechanisms that lower blood pressure and reduce blood volume. In turn, the heart must pump harder and faster just to maintain circulation. This can worsen heart failure, trigger arrhythmias, or even lead to acute events like heart attacks or strokes.

Who’s Most Vulnerable?

Heat-related strain is especially risky for people who:

  • Have existing heart disease
  • Are elderly
  • Take medications that affect temperature regulation (like diuretics or antihypertensives)
  • Are overweight or have poor blood circulation

Symptoms of Heat Illness to Watch For

Recognizing the warning signs of heat-related illness can make a critical difference, especially for individuals with heart conditions. Symptoms of heat exhaustion or heat stroke may include:

  • Heavy sweating or, in severe cases, lack of sweating
  • Muscle cramps or weakness
  • Dizziness, fainting, or confusion
  • Nausea or vomiting
  • Rapid or irregular heartbeat
  • Headache

If you or someone near you experiences these symptoms, especially chest pain, shortness of breath, or confusion, seek medical attention immediately. Heat stroke is a medical emergency and requires urgent treatment.

Protect Your Heart This Summer

At CTVS, our team of cardiothoracic and vascular surgeons is dedicated to promoting heart health year-round, offering expert care and guidance to keep patients safe in every season.

Here how to help keep your heart safe when it’s hot outside:

  • Stay Hydrated — Dehydration increases stress on the heart. Drinking water regularly is critical—even if you don’t feel thirsty.
  • Avoid Peak Heat Hours — Try to stay indoors or in shaded areas between 12–3 PM, when the sun, and heat stress, are at their peak.
  • Review Medications — Some cardiovascular drugs can impair heat tolerance. Speak with your provider to find out if your prescriptions fall into this category.
  • Check Air Quality — Heatwaves often coincide with poor air pollution, which can further strain the heart. Minimize exposure when air quality is low.

For questions about our vascular, cardiac, or thoracic services, please visit ctvstexas.com or call us at (512) 459-8753 to schedule an appointment.

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