Our bodies create a lot of heat. Normally, they're cooled through sweating and by heat radiating through the skin. But in very hot weather, high humidity, and other conditions, this natural cooling system may begin to fail, letting heat in the body build to dangerous levels. The can cause heat illness, such as heat cramps, heat exhaustion, or heatstroke. What Are Heat Cramps? Heat cramps are brief, painful muscle cramps in the legs, arms, or belly that can happen during or after vigorous exercise in extreme heat. Sweating during the intense physical activity causes the body to lose salts and fluids. This low level of salts likely causes the muscles to cramp. Kids are particularly at risk for heat cramps when they aren't drinking enough fluids. Although painful, heat cramps on their own aren't serious. But cramps can be the first sign of more serious heat illness, so they should be treated right away to help avoid any problems. What to Do: A cool place, rest, and fluids should ease a child's discomfort. Give water or fluids that contain salt and sugar, such as sports drinks. Gently stretching and massaging cramped muscles also may help. What Is Heat Exhaustion? Heat exhaustion is a more severe heat illness that can happen when someone in a hot climate or environment hasn't been drinking enough liquids. Symptoms can include: increased thirst weakness dizziness or fainting muscle cramps nausea and/or vomiting irritability headache increase sweating cool, clammy skin a raised body temperature, but less than 104°F (40°C) What to Do: Bring your child to a cooler place indoors, an air-conditioned car, or shady area. Remove your child's excess clothing. Encourage your child to drink water or cool fluids containing salt and sugar, such as sports drinks. Put a cool, wet cloth or cool water on your child's skin. Call your doctor for advice. A child who is too exhausted or ill to drink might need treatment with intravenous (IV) fluids. If left untreated, heat exhaustion can develop into heatstroke, a much more serious illness. What Is Heatstroke? The most severe form of heat illness is heatstroke. Heatstroke is a life-threatening medical emergency. In heatstroke, the body cannot regulate its own temperature. Body temperature can soar to 106°F (41.1°C) or even higher, leading to brain damage or even death if it isn't quickly treated. Quick medical care is needed to bring the body temperature under control. Kids are at risk for heatstroke if they overdress or do intense physical activity in hot weather without drinking enough liquids. Heatstroke also can happen when a child is left in, or gets trapped in, a car on a hot day. When the outside temperature is 93°F (33.9°C), the temperature inside a car can reach 125°F (51.7°C) in just 20 minutes, quickly raising body temperature to dangerous levels. What to Do: Call for emergency medical help if your child has been outside in extreme temperatures or another hot environment and shows one or more of these symptoms of heatstroke: severe headache weakness, dizziness confusion nausea rapid breathing and heartbeat loss of consciousness seizure no sweating flushed, hot, dry skin temperature of 104°F (40°C) or higher While waiting for help: Get your child indoors or into the shade. Undress your child and sponge or douse him or her with cool water. Do not give fluids unless your child is awake, alert, and acting normally. How Can We Prevent Heat Illness? To help protect kids from heat illness: Teach kids to always drink plenty of liquids before and during activity in hot, sunny weather — even if they're not thirsty. Kids should wear light-colored, loose clothing on hot days and use sunscreen when outdoors. On hot or humid days, limit outdoor activity during the hottest parts of the day. 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Find out more in this article for kids. Read More Dehydration Sometimes kids lose fluids and salts through fever, diarrhea, vomiting, or sweating. Here are some tips on preventing or treating dehydration. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.