A fever is usually when your body temperature is 38C You may feel warm, cold or shivery. Most fevers aren't in themselves life-threatening, however there are certain times where you may need to seek medical advice. If any of the following apply to you and you have a fever, please contact your GP practice immediately:. If you have a fever and any of the following medical conditions you should contact your GP practice immediately.
Top of the page Check Your Symptoms. Fever is the body's normal and healthy reaction to infection and other illnesses, both minor and serious. It helps the body fight infection. Fever is a symptom, not a disease. In most cases, having a fever means you have a minor illness. When you have a fever, your other symptoms will help you determine how serious your illness is.
Fever is an elevated body temperature. Temperature is considered elevated when it is higher than Although It is lowest in the early morning and highest in the late afternoon—sometimes reaching Similarly, a fever does not stay at a constant temperature.
The average body temperature is But "normal" body temperature varies from person to person. It also changes during the day, rising a bit after you eat or exercise.