Fevers have a large variety of reasons. Fever without any further symptoms are commonly due to an influenca type virus. Most fevers settle within 3-4 days and temperatures tend to be higher in the evening. However, fevers are a very poor indicator of the origin of disease and you need to make your decision of seeing a health professional dependent on how poorly the patient is.
See your GP:
- If the fever lasts for longer than 3-4 days.
- If you or the patient is feeling very unwell.