People who become overheated—when spending hours in the sun—can lose their ability to sweat. This can cause heatstroke, in which body temperature soars to more than 104°F. Heatstroke is lethal. It can cause brain damage and/or cardiac arrest if body temperature isn't lowered immediately.

Self-defense: Drink a lot of fluids—at least one-half ounce per pound of body weight daily. 'Water and sports drinks are better than carbonated beverages. The carbonation makes it more difficult for the body to absorb fluids. Also, wear ahat and light-colored clothing.

Heatstroke warning signs: Dry mouth, dizziness, nausea, fatigue.

What to do: Find a cool, shaded area immediately. Get in front of an air conditioner or a fan, or get in your car and turn the air conditioner on high. If you don't feel better within a few minutes, have someone take you to a first-aid station or an emergency room.

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