Spending time in a sauna may do more than help you relax. New research suggests that heat exposure can trigger a rapid response inside the body, sending important immune cells into circulation. These cells play a critical role in defending against illness and maintaining overall health.
In the study, participants who completed a 30-minute sauna session experienced a noticeable increase in circulating white blood cells, including key types that help the body identify and respond to potential threats. Researchers believe this temporary surge may improve how effectively these cells move through the body and carry out their protective functions.
Experts say this response is similar to what happens during physical exercise, where the body mobilizes internal defenses to stay resilient. While more research is needed to understand long-term effects, the findings suggest that regular heat exposure could be one more way to support the body’s natural defense systems.
SOURCE:
MedicalXpress, April 9, 2026