Heat exhaustion is usually accompanied by a fever no higher than 104 degrees Fahrenheit, excessive thirst, nausea, fainting, cool and clammy skin, weakness, muscle aches, heavy sweating, slow heartbeat and dizziness. Heatstroke may develop following heat exhaustion if the condition is not treated.

Drink a rehydration drink, water, juice, or sports drink to replace fluids and minerals. Drink 2 qt (2 L) of cool liquids over the next 2 to 4 hours. You should drink at least 10 glasses of liquid a day to replace lost fluids.

Recovery time for heat stroke is variable; initial recovery may be done with 1-2 days in the hospital; complete recovery may take about 2 months to a year. Recognizing the early warning signs of heat cramps and heat exhaustion and responding to those symptoms with cooling treatment.