What is exercise-related heat exhaustion?
Exercise-related heat exhaustion happens when your body becomes too hot during physical activity. This can occur when exercise, high temperatures, and humidity overwhelm your body’s ability to cool itself. As body temperature rises, dehydration and loss of important fluids can make symptoms worse.
Several factors can increase the risk of heat exhaustion, including:
- Exercising in high heat or humidity
- Not drinking enough fluids
- Wearing heavy or tight clothing
- Sudden activity in a hot environment without time to adjust
- Certain medications that affect sweating or hydration
- Chronic medical conditions
- Poor physical conditioning
Athletes, outdoor workers, older adults, and young children may be more vulnerable to heat-related illness.
Heat exhaustion is a serious condition, but early treatment is usually effective. Without prompt care, it can progress to heat stroke, which is a medical emergency.
Symptoms
Heat exhaustion often develops during intense activity in hot or humid weather. Symptoms may begin gradually or come on suddenly.
Common symptoms include:
- Heavy sweating
- Dizziness or feeling faint
- Weakness or unusual fatigue
- Headache
- Muscle cramps
- Nausea or vomiting
- Rapid heartbeat
- Cool, pale, or clammy skin
- Trouble concentrating
- Dehydration
How is it diagnosed?
A healthcare provider will ask about your symptoms, recent physical activity, and exposure to heat. They will also check your temperature, hydration status, heart rate, and blood pressure.
In some cases, blood or urine tests may be used to look for dehydration, electrolyte imbalance, or signs of more serious heat illness. Providers may also evaluate for conditions such as heat stroke if symptoms are severe.
How is it treated?
Treatment starts with cooling the body and replacing lost fluids. Most people begin to feel better quickly when treated early.
Common treatments include:
- Stopping activity right away
- Moving to a cool or shaded place
- Drinking water or electrolyte-containing fluids
- Removing extra clothing or sports equipment
- Applying cool towels, ice packs, or misting with water
- Resting with legs elevated
More severe cases may require IV fluids or emergency medical care. If symptoms include confusion, fainting, seizures, or worsening weakness, immediate medical attention is important.
Most people recover fully within several hours when heat exhaustion is recognized and treated promptly.
