The following tips may help prevent a heat-related illness. Be aware of the symptoms of heat-related illnesses and the warning signs of dehydration.
Practice heat safety measures when you are physically active in hot weather. This is especially important for outdoor workers and military personnel. Avoid strenuous activity in hot, humid weather or during the hottest part of the day (between 10 a.m. and 4 p.m.). Use caution during your physical activity in the heat if you have health risks.
Drink plenty of water before, during, and after you are active. This is very important when it's hot out and when you do intense exercise. Fluids such as rehydration drinks, juices, or water help replace lost fluids, especially if you sweat a lot.
Drink on schedule. Two hours before exercising, drink 24 fl oz (750 mL) of fluid. Drink 16 fl oz (500 mL) of fluid 15 minutes before exercising. Continue drinking 8 fl oz (250 mL) of fluid every 15 minutes while exercising.
Check your urine. Urine should be clear to pale yellow, and there should be a large amount if you are drinking adequately. You should urinate every 2 to 4 hours during an activity when you are staying properly hydrated. If your urine output decreases, drink more fluids.
Do not spend much time in the sun. If possible, exercise or work outside during the cooler times of the day. Wear lightweight, light-colored, loose-fitting clothing in hot weather, so your skin can cool through evaporation. Wear a wide-brimmed hat or use an umbrella for shade.
Stay cool as much as possible. Take frequent breaks in the shade, by a fan, or in air-conditioning. Cool your skin by spraying water over your body. Take a cool bath or shower 1 or 2 times a day in hot weather.
If you have to stand for any length of time in a hot environment, flex your leg muscles often. This prevents blood from pooling in your lower legs, which can lead to fainting. To prevent swelling (heat edema), wear support hose to stimulate circulation while standing for long periods of time.
Do not drink alcohol. It increases blood flow to the skin and increases your risk of dehydration.