How long does influenza fever last?

Fever is part of the body's response to influenza. Chills may happen as the temperature rises, followed by sweating as it falls. The number on a thermometer matters less than the overall pattern, hydration, breathing, and alertness. A person may feel weak even after the fever has gone. See [Influenza](/conditions/influenza/) alongside related [Fever](/symptoms/fever/) and [Chills](/symptoms/chills/) information.

Rest, take regular fluids, and choose light meals as tolerated. Wear breathable clothing and keep the room comfortably cool. Follow the label or a clinician's directions for any fever medicine, and check before giving medicines to a child or combining products. Stay home while unwell and reduce close contact with others. A [Cough](/symptoms/cough/) or [Fatigue](/symptoms/fatigue/) may outlast the fever.

Arrange medical advice if fever is not improving, returns after a period of improvement, or comes with worsening weakness, dehydration, confusion, chest pain, or breathing difficulty. Seek urgent help for severe breathing trouble, blue or grey lips, inability to stay awake, or a seizure. A clinician may assess for complications such as [Pneumonia](/conditions/pneumonia/), especially when a cough or breathing symptoms worsen.

Ask whether your fever pattern needs an examination, which medicines are suitable for you, and what signs would mean you should return for review.