If the brain senses an increase in body temperature, the body will initially attempt to rid itself of the excess heat by increasing blood flow to the outer skin layers. But in very hot and humid conditions, sweat may not evaporate rapidly enough to effectively aid in reducing body heat - and the body's ability to regulate its temperature can be impaired. Moderate symptoms may include heavy sweating, giddiness, heavy thirst and some nausea. Remove excess clothing. Encourage the victim to drink plenty of fluids.
Sport drinks can help to replenish minerals lost through sweating.
Avoid strenuous outdoor work during the hottest part of the day. If possible, work during the early morning hours. Wear a wide-brimmed hat in the sun. Take frequent breaks in cool, shaded or air conditioned areas. Eat lighter, smaller meals.