Flu fever symptoms: what to know

Fever symptoms may come with a sudden feeling of being unwell rather than a gradual mild irritation. Chills can occur even while the measured temperature is rising, and sweating may follow. A thermometer is more reliable than touch, but one reading does not explain the cause. Flu may also cause cough, sore throat, headache, and body aches. A common cold can overlap, while COVID-19, acute bronchitis, or childhood infections such as bronchiolitis and croup may need separate consideration.

Rest and take frequent drinks; small sips can be easier if nausea is present. Use a thermometer correctly and record readings alongside the time and symptoms. Choose loose clothing and avoid overheating under heavy bedding. If you take a fever or pain medicine, follow the package directions and check with a pharmacist when pregnant, treating a child, or using other medicines. Limit close contact while feverish, improve airflow, and wash hands after coughing or blowing your nose.

Get urgent help for difficult breathing, chest pain, new confusion, a seizure, fainting, blue or grey lips, or inability to drink. Arrange medical advice if symptoms are severe, continue to worsen, improve and then return, or include a stiff neck, unusual rash, severe dehydration, or profound weakness. Seek earlier guidance for a baby, an older adult, pregnancy, or a long-term condition. These groups can become unwell quickly even when the initial symptoms seem familiar.

Which symptoms make flu more likely than a cold? Should I test for another respiratory infection? How can I monitor hydration? Are my current medicines suitable? When should I return if the fever symptoms change?