About this symptom
Fever is a response that can accompany infection, inflammation or other conditions. The thermometer reading alone does not identify the cause or tell how ill a person is.
What this topic means
A raised temperature may occur in viral and bacterial illness and many other situations. Duration, age, underlying illness and associated symptoms shape the need for medical assessment.
When to seek medical advice
Record how the temperature was measured, its duration, chills, tiredness, headache, body aches, cough, abdominal symptoms, rash and exposure history. Consider medicines already taken and any long-term medical conditions.
Options and limitations
High fever alone does not prove that antibiotics are needed. Conversely, a dangerous infection can occasionally present without a very high reading. Do not rely on temperature as the sole indicator of severity.
Assessment and preparation
A clinician evaluates general appearance, breathing, pulse, hydration, history and examination findings. Blood tests, imaging or pathogen testing are ordered when findings suggest they may change management.
Treatment, risks and follow-up
Care depends on the cause and severity. Fluids, rest and appropriately selected symptom relief may help, but antibiotics should not be started solely because the temperature is elevated.
When urgent help is needed
Confusion, seizures, severe breathing difficulty, a stiff neck, a rash that does not fade under pressure or signs of severe dehydration need immediate emergency care: call 103.
Related information
Signs and symptoms
Record how the temperature was measured, its duration, chills, tiredness, headache, body aches, cough, abdominal symptoms, rash and exposure history. Consider medicines already taken and any long-term medical conditions.
Diagnosis and tests
A clinician evaluates general appearance, breathing, pulse, hydration, history and examination findings. Blood tests, imaging or pathogen testing are ordered when findings suggest they may change management.
Care and treatment approaches
Care depends on the cause and severity. Fluids, rest and appropriately selected symptom relief may help, but antibiotics should not be started solely because the temperature is elevated.
When to seek urgent care
Confusion, seizures, severe breathing difficulty, a stiff neck, a rash that does not fade under pressure or signs of severe dehydration need immediate emergency care: call 103.
Frequently asked questions
Does high fever always mean a bacterial infection?
No. The temperature itself cannot establish the organism or whether antibiotics will help.
What should I tell the doctor?
Report duration, measurement method, associated symptoms, medical conditions and medicines used.
When should I not wait for an appointment?
Seizures, confusion, breathing problems, a non-blanching rash or another severe warning sign require urgent help.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
