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Heat Health Effects

When the outdoor temperatures begin to rise, staying cool can be difficult and exposure to high temperatures can cause serious or life-threatening health effects. During these times, our greatest concerns are for the people most at risk. These include infants, seniors, the homeless, outdoor workers, athletes, people living in poorly ventilated homes or without air conditioning, and anyone with a power outage due to other weather-related events.

If you are experiencing any of the symptoms listed below during a heat event, try to move to a cool place, and drink liquids right away. Water is best.

Heat stroke is a medical emergency! If you are caring for someone who has a high body temperature and is either unconscious, confused, or has stopped sweating, call 911 or your local emergency number immediately.

Our body's temperature control system can become overwhelmed and our internal body temperature increases.

We cool our body by sweating, however, when the humidity is high, sweat will not evaporate as quickly. This prevents the body from releasing heat quickly and high body temperatures can damage the brain or other vital organs.

There are a wide range of heat related illnesses. Examples include:

  • Dizziness or fainting
  • Extreme thirst
  • Vomiting or nausea
  • Behavioural changes in children
  • Rapid heartbeat and or breathing

Being aware of the signs and symptoms can help prevent medical emergencies such as heat exhaustion and heat stroke. Get medical attention immediately during signs of fainting, heat exhaustion, or heat stroke. It is important to know the signs and symptoms of heat related illnesses and how to protect yourself and your family. Health Canada provides further information on signs, symptoms, and safety tips during extreme heat.

  • Children's body systems produce more heat than adults.
  • Their ability to sweat is not as great as adults; so it is more difficult to cool off.
  • The effects of fluid loss through sweating are greater in children.
  • Children rely on others to provide necessary fluids.
  • Children with existing medical conditions are at an even greater risk.
  • They do not adjust as quickly to sudden changes in temperature.
  • They are more likely to have existing medical conditions that can affect their response to heat.
  • They are more likely to take medications that impair their body's ability to regulate temperature, or that limit their ability to sweat.
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