Heat Exhaustion is a condition whose symptoms may include heavy sweating and a rapid pulse, a result of your body overheating. It’s one of three heat-related syndromes, with heat cramps being the mildest and heatstroke being the most severe.

Causes of heat exhaustion include exposure to high temperatures, particularly when combined with high humidity, and strenuous physical activity. Heat exhaustion symptoms may develop suddenly or over time, especially with prolonged periods of exercise.

Symptoms of heat exhaustion begin to appear when your body becomes unable to regulate its heat loss. Hot weather, strenuous activity, alcohol consumption, and overdressing can all promote overheating.

According to Mayo Clinic, symptoms of heat exhaustion can appear suddenly or over a period of time. Faintness, nausea, dizziness, and fatigue are common symptoms, as are headaches, low blood pressure upon standing and heavy sweating. If your skin is cool, moist and has goosebumps even though you are in the heat, you may be experiencing heat exhaustion.

Pay attention to your symptoms of heat exhaustion and stop your activity to rest, find a cooler location, and rehydrate. If the symptoms worsen, contact your doctor. If your body temperature is 104 F or higher, seek immediate medical attention.