As cold plunge pools become a fitness staple in homes and gyms, cardiologists are sounding the alarm about potentially dangerous cardiovascular responses, particularly for people with undiagnosed heart conditions.

The Risk

Sudden cold immersion triggers a massive spike in blood pressure and heart rate known as the cold shock response. Three deaths linked to cold plunging have been reported in 2026, all in men under 50 with undetected cardiac abnormalities.

Safe Practices

Doctors don't oppose cold plunging for healthy individuals but recommend cardiac screening first, gradual temperature acclimation, and never plunging alone.