Overview
A fever is a higher-than-usual body temperature. It is a symptom, not a disease, and often means the body is fighting an infection. Educational note: possible causes below are general categories, not a personal diagnosis.
Symptoms
- feeling hot or shivery
- sweating
- headache or aches
- tiredness
Causes
- possible categories only — infections such as viral or bacterial illness
- inflammatory conditions
- some medicines or immunisations
- heat-related illness (separate from fever)
Risk factors
- recent infection or exposure
- very young or older age
- weakened immune function
Prevention
- hand hygiene and staying up to date with recommended vaccines
- avoiding contact with people who are unwell where possible
Emergency warning signs
- stiff neck with rash or severe headache
- difficulty breathing
- confusion, seizures, or unresponsiveness
- fever in a baby under 3 months
Evaluation & tests
Educational note: a list of possible causes is not a personal diagnosis. A clinician finds the cause of a fever. This library does not diagnose.
Treatment education
Educational overview: care depends on the cause and is individualized by clinicians. This library does not prescribe.
Self-care
General education: rest, fluids, and monitoring can help mild illness; follow clinician guidance, especially for infants.
When to seek care
Seek care for a fever in a young infant, a very high or persistent fever, or a fever with concerning symptoms.