Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

First Aid & Emergencies

Font Size

Heat-Related Illnesses - Prevention

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.
    • Drink rehydration drinks, which are absorbed as quickly as water but also replace sugar, sodium, and other nutrients. Eat fruits and vegetables to replace nutrients.
    • 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.
    Next Article:

    Today on WebMD

    Antibiotic on hand
    3d scan of fractured skull
    Father putting ointment on boy's face
    Person taking food from oven
    sniffling child
    wound care true or false
    caring for wounds
    Harvest mite

    Pollen counts, treatment tips, and more.

    It's nothing to sneeze at.

    Loading ...

    Sending your email...

    This feature is temporarily unavailable. Please try again later.


    Now check your email account on your mobile phone to download your new app.

    WebMD the app

    Get first aid information. Whenever. Wherever... with your iPhone, iPad or Android.

    Find Out More