Fever after a hot day

Skin can feel hot after exercise or time outdoors without the body having a fever. A thermometer helps distinguish temporary warmth from a raised internal temperature. Heat exposure can cause fluid loss, headache, dizziness, heavy sweating, thirst, weakness, or darker urine. Respiratory symptoms, diarrhoea, urinary symptoms, or a sick contact may point toward an infection instead. The timing, associated symptoms, and response to cooling are useful clues, but they cannot replace an examination when symptoms are severe.

Stop exertion and rest in a cool, ventilated room. Remove extra layers and use a cool shower or damp cloths. If fully alert, drink water or an oral rehydration solution in small, regular amounts. Avoid alcohol and strenuous activity while symptoms continue. Recheck the temperature after resting rather than repeatedly measuring immediately after exercise. Do not use fever medicine to push through ongoing heat exposure or to conceal worsening symptoms.

Get emergency help for confusion, fainting, seizures, breathing difficulty, inability to drink, repeated vomiting, or severe weakness. Arrange prompt medical advice if the temperature remains raised after cooling, symptoms worsen, urine becomes very dark or scarce, or the person has a significant medical condition. An infant, older adult, pregnant person, or someone taking medicines that affect fluid balance may need earlier assessment.

Ask whether the pattern suggests heat illness or infection, how to replace fluids, which medicines are safe, and how long to avoid strenuous activity.