Heat related illness
During very hot and extreme heat conditions, people are at greater risk of health problems. These can be specific heat-related illnesses or a worsening of existing medical problems.
Risk is greatest during heat waves and when the temperature hovers about 5C or more above average for 3 or more days. The risk is increased when high temperatures are combined with increased humidity.
At-risk groups:
- older people, particularly the frail and those living alone
- babies and young children
- people with existing medical conditions, such as heart disease
- people on certain medications, in particular fluid tablets
- those on fluid restricted diets
- people who are on medications for mental health conditions or people who use recreational drugs may be at greater risk.
Read more about preventing heat illness and staying healthy during a heat wave.
Heat related illness
Heat related illness can occur when the body is unable to cool itself adequately. The body normally cools itself by sweating. In some situations, sweating isn't enough and body temperature rises. This can be associated with different effects ranging from a mild heat rash or cramps through to heat exhaustion or the more severe and potentially fatal heat stroke.
People can experience heat related illness during periods of extreme heat in summer. It can also occur in athletes or others during periods of physical exertion.
Heat rash
What to look for | What to do |
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Dehydration
Can lead to heat exhaustion without prompt treatment
What to look for | What to do |
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Heat cramps
Can be an early warning sign of heat exhaustion
What to look for | What to do |
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Heat exhaustion
Can lead to heatstroke without prompt treatment
What to look for | What to do |
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Heatstroke
This is a medical emergency – call Triple Zero (000) immediately
What to look for | What to do |
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As per heat exhaustion, plus:
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More information
- call 13 HEALTH (13 43 25 84) for advice
- contact your doctor
- ring 000 in an emergency
- contact your local public health unit.