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Even severe heat stress can appear suddenly, so learn the warning signs and how to treat them.
Core body temperature stays at 98.6°F (37°C). It isn't dangerous unless the symptoms aren't treated. Signs and symptoms include:
Sweating a lot
Having painful spasms in your muscles during activity or hours afterward (heat cramps)
Developing tiny red bumps on skin and a prickling sensation (prickly heat)
Feeling irritable, dizzy, or weak
Treatment: Get medical advice and do the following:
Rest in a cool, shady area.
Drink water or a sport drink.
Core body temperature may rise up to 101°F (38.3°C). It should be treated right away. Signs and symptoms include:
Cold, moist, pale or flushed skin
Feeling very weak or tired
Headache, nausea, loss of appetite
Feeling dizzy or giddy
Rapid or weak pulse
Treatment: Get medical treatment! You may be told to:
Drink water or a sport drink. In some cases, a medical professional must administer fluids.
Take salt (in some cases).
Use cool compresses on the forehead, around the neck, and under armpits.
Blow air onto your skin with fans.
This is a serious, life-threatening medical emergency. Core body temperature can rise to 105°F (40.5°C) or more. If not treated right away, heat stroke can lead to permanent brain damage and even death. Signs and symptoms include:
Hot, dry skin that looks red, mottled, or bluish
Deep, fast breathing
Headache or nausea
Rapid, weak, or irregular pulse
Feeling dizzy, confused, or delirious
Treatment: Someone should call for emergency help right away. While waiting for emergency help, the affected person should:
Have clothing soaked with cool water. Or, remove outer clothing and be wrapped with a sheet soaked in cool water.
Be blown with fans.
Drink water or a sport drink. (Do not try to give a drink to someone who is unconscious.)