Heat, Cold and Heart Health: What You Need to Know

The way the weather feels can alter how our hearts work. Extreme heat or cold heightens the risk of heart attacks, strokes, sudden death and other serious conditions.

Scientists warn that this problem is worsening as global temperatures rise and extreme weather events become more frequent.

Why the Risk Is Growing

• Environmental factors: Temperature extremes directly stress cardiovascular function.
• Socioeconomic variables: Where a person lives, their income level, job type, and existing health conditions all amplify vulnerability.
• Physiological responses: The nervous system accelerates, blood vessels constrict, inflammation escalates, and thermoregulation falters—each change can damage the heart.

Systemic Impact

• Healthcare strain: Emergency rooms see surges, clinics struggle to stay open, and the entire health system can feel weakened.
• Carbon feedback loop: Treating heart disease itself emits significant greenhouse gases, further fueling climate change.

Multi‑Level Solutions

Research Gaps

• Accurate exposure measurement over time.
• Drug–temperature interactions.
• Protective factors that shield certain populations.

Call to Action

Scientists, clinicians, policymakers, and the public must collaborate to mitigate cardiovascular risks posed by a changing climate.