Fever after heat exhaustion

Heat exhaustion results from losing fluid and salt while the body struggles to cool itself. A raised temperature may mean the person has not recovered, is becoming more severely overheated, or has a separate illness. Dizziness, headache, excessive sweating, thirst, weakness, nausea, or dark urine can accompany fluid loss. Confusion, collapse, seizures, or a very hot body are warning signs of heat stroke rather than simple recovery.

Stop activity and place the person in shade or an air-conditioned room. Remove extra clothing and cool the skin with damp cloths, fanning, or a cool shower. If they are awake and able to swallow, offer frequent small sips of water or an oral rehydration drink. Do not leave them alone. Avoid alcohol and strenuous activity until fully recovered. If vomiting prevents drinking, do not force fluids; arrange medical help.

Call emergency services for confusion, fainting, a seizure, severe weakness, breathing difficulty, repeated vomiting, or inability to drink. Get urgent assessment when a raised temperature continues despite cooling, symptoms are worsening, or the person remains dizzy or unusually sleepy. Medical teams may need to check hydration, body temperature, kidney function, and other effects of heat illness. Children, older adults, pregnant people, and those with chronic conditions can deteriorate quickly.

Ask whether the temperature suggests heat stroke or another illness, how to replace fluids safely, when normal activity can resume, and how to prevent a repeat episode.