Research highlighted by scientists suggests that heatwaves do more than cause discomfort. Higher temperatures can place stress on the body and the brain, and the effects may begin before conditions reach what many people would consider extreme heat.
On the physical side, hot weather can make it harder for the body to regulate temperature. That added strain can leave people feeling tired, weak or unwell, especially when heat lasts for several days. The findings also point to a broader health burden during heatwaves, not just in the most severe cases.
The research also draws attention to the brain. As temperatures rise, mental function can be affected alongside physical wellbeing. That can mean changes in how clearly people think, how alert they feel, and how well they cope with daily tasks when the weather stays hot.
The overall message from the research is that heat-related health effects should not be seen only as a problem at the most dangerous temperature levels. Scientists say rising heat can begin to affect the body and brain earlier than many people expect, making heatwaves a growing public health concern.
