How long heat exhaustion symptoms last

Recovery depends on how much fluid was lost, how long heat exposure continued, whether activity stops, and the person’s health and medicines. Thirst, weakness, headache, nausea or [Dizziness](/symptoms/dizziness/) may linger after leaving the heat. [Dark Urine](/symptoms/dark-urine/) can indicate that fluid replacement is still needed. Heat exhaustion is different from ordinary tiredness because it follows heat strain and may involve heavy sweating or difficulty functioning. See [Heat Exhaustion](/conditions/heat-exhaustion/) and [Dehydration](/conditions/dehydration/).

Rest in a cool environment and avoid exercise, outdoor heat and alcohol while symptoms remain. Loosen clothing, cool the skin with damp cloths or a fan, and take frequent small sips of water or an oral rehydration drink if you are alert and not vomiting. Resume normal activity gradually only when you feel well. Track whether thirst, sweating and urine output are moving back toward normal; [Excessive Sweating](/symptoms/excessive-sweating/) may signal continued strain.

Get urgent help for confusion, fainting, seizure, difficulty waking, severe breathing trouble, repeated vomiting, inability to drink or worsening overheating. Arrange prompt medical advice when symptoms are not clearly improving with cooling and fluids, or return after rest. A severe [Headache](/symptoms/headache/) or marked [Excessive Thirst](/symptoms/excessive-thirst/) also warrants assessment.

Ask what recovery signs to expect, when you may return to work or exercise, how to replace fluids, and whether another illness could explain symptoms that continue.