What should you know about fever degree?

Temperature changes naturally during the day and can vary with age, activity, clothing, room temperature, and the measuring site. A mouth, ear, forehead, or armpit reading may not be directly interchangeable. Record the number, method, time, and other symptoms so a clinician can interpret the pattern.

Fever may occur with respiratory infections such as Common Cold or COVID-19, and with illnesses that cause cough, rash, or breathing symptoms. A number cannot distinguish a viral illness from another cause, and a normal reading does not rule out illness if you feel unwell.

Rest, drink fluids regularly, and choose light clothing. Follow the label or a clinician’s advice if using a fever-reducing medicine; check ingredients to avoid taking duplicate products. Use a reliable thermometer in the same way each time, and avoid very cold baths, ice, or rubbing alcohol on the skin.

Keep notes about the temperature trend, urine output, alertness, pain, cough, vomiting, diarrhoea, or rash. This information is especially useful if symptoms change after travel, a new medicine, or contact with someone who is ill.

Seek urgent help for trouble breathing, severe confusion, fainting, a seizure, a stiff neck with severe headache, blue or grey lips, or a rapidly spreading rash. Prompt medical assessment is also sensible when fever is persistent, repeatedly returns, or occurs with dehydration, severe pain, or marked drowsiness.

For an infant, an older adult, pregnancy, or a person with reduced immunity or a serious long-term condition, contact a healthcare professional sooner because illness can become significant with less warning.

Which thermometer and measuring site should I use? What symptoms would change the urgency? Could any current medicine, recent travel, or existing condition affect the reading?