103°F fever in Celsius: what it means and what to do

The temperature number does not reveal the cause by itself. Symptoms, age, medical conditions, recent travel, medicines and how unwell the person appears all affect the next step.

Fever is part of the body's response to illness. Respiratory infections, skin infections and other inflammatory or infectious conditions can present with fever, but a thermometer reading cannot distinguish among them.

Recheck an unexpected result with a reliable digital thermometer, following its instructions and using the same body site when comparing readings. Heavy clothing, a hot room, recent exercise or a hot bath can affect a measurement.

Encourage frequent fluids, allow rest and use light, comfortable clothing. Do not use ice baths or alcohol rubs; they can cause shivering or harm. If considering paracetamol or ibuprofen, check that it is suitable for the person's age, health conditions and other medicines, and follow the product label or a clinician's dosing advice.

Record the temperature, measurement method, medicines given and accompanying symptoms. Arrange prompt clinical advice if the fever persists, returns, or the person's condition is worsening.

Seek emergency help for difficulty breathing, blue or grey lips, severe drowsiness, confusion, a seizure, a stiff neck, a rash that does not fade when pressed, severe headache, repeated vomiting, inability to drink, or signs of dehydration such as very little urine.

A baby younger than three months with a fever needs urgent medical assessment. People who are pregnant, immunocompromised, receiving cancer treatment, or living with a serious long-term condition should seek individualized advice promptly.

Ask what symptoms would change the urgency, whether testing is needed, which fever medicine and dose are appropriate, and when the temperature should be checked again. Mention recent travel, sick contacts, rashes, pain, cough, urinary symptoms and all medicines already taken.