Heat exhaustion is usually caused by exposure to extreme temperature and/or not replacing fluid being lost by sweating. This condition can be hastened if the patient is wearing too much clothing for hot temperatures, and not replacing fluid.

• Weakness
• Loss of appetite
• Fainting
• Dizziness
• Sweating
• Nausea/vomiting

• Rest patient in a cool place
• Give patient fluid to drink. Most patients will respond well with water, fruit juice, or their soft drink of choice
• Arrange medical attention, or call 111 for an ambulance, if the patient’s condition gets worse or if they are unable to drink fluids

For comprehensive first aid information please refer to the St John Emergency Handbook. You can also ensure you’re ready to help by completing a St John First Aid course.