Fever with no other symptoms

Some infections begin with fever before cough, sore throat, stomach symptoms or a rash appears. In other cases, fever remains the only noticeable change for a short time. Recent vaccines, heat exposure and inflammatory conditions can also be relevant. The fever itself does not reveal which explanation applies.

Confirm the reading with a thermometer and consider how the person looks and behaves. Note chills, headache, pain, urine changes, breathing, appetite and new medicines. Children, older adults and people with reduced immunity may show fewer obvious symptoms while still becoming unwell.

Encourage fluids, offer rest and use breathable clothing. Record temperature readings and any new symptoms, including when they begin. Do not force food, bundle someone under heavy blankets, or use antibiotics left from an earlier illness. If the fever continues or the person is not returning to usual behaviour, arrange clinical advice.

Get emergency help for confusion, collapse, a seizure, severe breathing difficulty, a stiff neck, or difficulty waking. Seek prompt medical advice for poor drinking, repeated vomiting, signs of dehydration, severe pain, a purple rash that does not fade when pressed, or a person at higher medical risk. A fever that persists, returns, or is accompanied by a clear new symptom should be reviewed.

Ask how long to monitor, whether an examination or test is appropriate, how to support fluids, and which specific change should prompt urgent contact.