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A fever feels alarming, but it is usually your immune system doing exactly its job — turning up the body's thermostat to fight an infection. This guide to fever in adults explains what the temperature bands mean, sensible home care (rest, fluids, light clothing), and when a fever genuinely deserves a call or visit: lasting more than three days, or arriving with a stiff neck, rash, confusion, trouble breathing or severe headache. It also covers the stricter rules for babies and young children, whose fevers are assessed more cautiously. Educational guidance, never a diagnosis — the number matters less than how you feel.
What a raised temperature usually means, sensible home care, and the honest list of when a fever deserves a call or visit.
Most sources treat 38°C (100.4°F) as a fever in adults. Below that, readings in the 37.5-38°C zone are a mild elevation — common after exercise or in warm rooms, and usually nothing to chase.
Most simple viral fevers settle within two to three days. A fever beyond three days, or one that keeps returning after settling, deserves a medical conversation.
Fever medicine is for comfort, not for hitting a target number — treat aches and feeling dreadful, not the thermometer. If you feel reasonably well, letting a mild fever run its course is fine for otherwise healthy adults.
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