It’s extremely hot and I’m feeling weak and dizzy. Could I have heat stroke?

By Lily Hospers, James Smallcombe, Ollie Jay, University of Sydney

Australia is braced for a hot, dry summer. El Nino is back, and this year it will occur alongside an Indian Ocean dipole, a climate pattern which will further amplify this hot and dry effect.

Hot weather can place great stress on our bodies. When the environmental conditions exceed the limit at which we can adequately cope, we can suffer from heat-related illnesses.

Heat illnesses can vary, from relatively mild heat exhaustion to the potentially life-threatening condition of heat stroke.

What are the signs and symptoms?

If you’re suffering from heat exhaustion, you may feel weakness, nausea, headaches or dizziness.

Mild symptoms of heat exhaustion can often be treated at home by reducing your levels of physical activity, finding shade, removing excess clothing, hydrating with water and perhaps even taking a cool shower.

If left unchecked, heat exhaustion can progress to the far more serious condition of heat stroke, where your core temperature climbs upwards of 40°C. Symptoms can develop rapidly and may include confusion, disorientation, agitation, convulsions, or it could even result in a coma.

Heat stroke is a medical emergency and requires urgent treatment. Call an ambulance and start rapid, aggressive cooling by immersing the person in cold water (such as a cold bath). If this isn’t possible, apply ice packs to their neck, armpits and groin and cover the skin with lots of cool water.

When it comes to cooling someone with suspected heat stroke, the quicker the better: cool first, transport second.

Why do we overheat?

Environmental conditions play an important role in determining our heat stress risk. If the air temperature, humidity and levels of sun exposure are high, we are much more likely to dangerously overheat.

When the body gets hot, the heart pumps more warm blood to our skin to help lose heat. As air temperature rises, this way of shedding heat becomes ineffective. When air temperature is higher than the temperature of the skin (normally around 35°C), we start gaining heat from our surroundings.

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