Please familiarise yourself with the symptoms of heat-related illness, including heat stress, heat stroke, dehydration and hyponatremia, before walking in extreme temperatures.

Symptoms of Heat Stress and Heat Stroke

Heat stress occurs when the body can’t cool itself fast enough to maintain a healthy temperature. Heat stroke is an extreme form of heat stress and can be life-threatening.

Potential symptoms are:

  • thirst, dry mouth, dry lips
  • cold or clammy sweating
  • painful muscle spasms
  • headache
  • irritability
  • confusion
  • dizziness
  • nausea
  • high body temperature (over 38.5°C)
  • altered mental state
  • confusion, disorientation or rapid development of unconsciousness
  • dry skin
  • dry, swollen tongue
  • rapid, strong pulse at first, becoming weaker
  • fits, seizures or coma

Symptoms of Hyponatremia

Hyponatremia is caused by an imbalance of sodium electrolytes in the body, which leads to an inability to regulate water.

Potential symptoms are:

  • headache
  • nausea or vomiting
  • lethargy or irritability
  • absent or reduced reflexes
  • confusion
  • seizures

Symptoms of Dehydration

  • feeling thirsty
  • dark yellow and strong-smelling pee
  • feeling dizzy or lightheaded
  • feeling tired
  • a dry mouth, lips and eyes
  • peeing little, and fewer than 4 times a day