How is heat exhaustion treated?

Heat exhaustion develops when sweating and heat exposure cause the body to lose fluid and salt faster than they are replaced. It can cause weakness, [Dizziness](/symptoms/dizziness/), headache, nausea, thirst and heavy sweating. The person is usually alert, but heat illness can worsen quickly, especially in humid conditions, during exertion or when drinking is difficult.

Stop activity and move the person into shade or an air-conditioned place. Remove unnecessary outer clothing, loosen tight clothing and cool the skin with wet cloths, a fan or a cool shower. If they are awake and able to swallow, give frequent small sips of cool water or an [Oral Rehydration Therapy](/treatments/acute-and-urgent-care/oral-rehydration-therapy/) drink. Do not give fluids to someone who is confused, vomiting repeatedly or unable to swallow.

Call emergency services for confusion, collapse, seizure, loss of consciousness, very hot skin, severe breathing difficulty or inability to drink. These may indicate heatstroke. Seek medical care if symptoms do not improve promptly with cooling and fluids, or if vomiting prevents drinking; [IV Fluid Therapy](/treatments/acute-and-urgent-care/iv-fluid-therapy/) may be considered by clinicians.

Ask whether medicines, illness or work conditions increased your risk, how to replace fluids during future heat exposure, and when you can safely return to exercise. Mention recurring [Excessive Sweating](/symptoms/excessive-sweating/) or [Heat Intolerance](/symptoms/heat-intolerance/).