Heat stroke is where the body is no longer able to cool itself and a person’s body temperature becomes dangerously high.
Heat stroke is less common than heat exhaustion but more serious. Symptoms are flu-like and include dizziness and nausea. The person will have a temperature and look flushed but their skin remains dry.
First cool the person down, take them to a cool place, loosen or remove outer clothing. Place the person in a half-sitting position, supporting their head and shoulders.
Bathe arms, forehead and chest with cool water.
Children should be stripped down and wrapped in a wet towel.
If symptoms persist seek medical help.
Source: www.careinthesun.org