The elderly, people with significant underlying chronic diseases, including heart and lung disease, weakened immune systems, mental health disorders and dementia are most effected by extreme heat. People who work outdoors or in extreme heat conditions - outdoors or indoors are also at risk.
You can be more or less vulnerable to health risks from extreme heat based on these factors:
Sensitivity - the degree to which you are affected by a stressor such as higher temperatures
Exposure - the physical contact between you and higher temperatures
Adaptive capacity - your ability to adjust to or avoid potential hazards