A sweltering heat wave in Australia took its toll on runners in the Sydney Marathon on Sunday, with 26 people taken to the hospital and about 40 treated for heat exhaustion by emergency services.

What are the first signs of heat exhaustion?Here is what to keep an eye out for. What is heatstroke? Symptoms and treatment for this deadly heat-related illness; Featured Weekly Ad.

On hot days heat exhaustion can occur quickly, particularly for the elderly, and those with pre-existing health conditions. If a person is unable to cool down at this point, they might feel ...

If the body heat continues to build and the core body temperature rises above 40°C, a much more severe heat stroke could begin. At this point, it's a life-threatening emergency requiring ...

“Heat exhaustion can lead to heat stroke, a serious heat-related illness,” the CDC explains. “Heat stroke is when body’s temperature rises quickly, and your body cannot cool itself down.” ...

The Paris Olympics opened with rain on its parade, then blistering heat and, finally, a week of pleasant sunshine. As it comes to a close on Sunday, temperatures are expected to again soar up to ...