Fever is defined as a core body temperature above 38°C (100.4°F), produced by the hypothalamic thermostat resetting in response to pyrogens — chemical signals released by immune cells during infection, inflammation, or tissue injury. It is one of the most common presenting symptoms across all age groups and clinical settings. Causes range from viral upper respiratory tract infections (the most common) to bacterial infections (urinary tract infection, pneumonia, meningitis), autoimmune disease, malignancy, medication reactions, and heat-related illness.

What lifestyle changes can help with fever?

Adequate hydration is the most important supportive measure during fever. Light, easily digestible nutrition supports immune function. Rest facilitates recovery. Cooling measures (tepid sponging, light clothing, cool room) provide comfort. Monitoring temperature trend and associated symptoms guides whether and when to seek further assessment.

What integrative approaches support fever?

Antipyretics (paracetamol, ibuprofen) reduce fever and associated discomfort but do not treat the underlying cause and may not shorten illness duration. Antibiotic treatment is appropriate only for confirmed or strongly suspected bacterial causes. Evidence supports watchful waiting for uncomplicated viral infections in otherwise healthy adults. Fever in the context of immunosuppression requires urgent medical evaluation.

When should I seek professional support for fever?

Seek urgent medical assessment for fever above 39.5°C that does not respond to antipyretics, fever in an infant under 3 months, fever with severe headache and neck stiffness, fever with difficulty breathing, or fever in an immunocompromised individual. Seek routine assessment for fever persisting more than three to four days without improvement.

immuneAlternativeComplementaryHolistic

Fever

An elevation in body temperature above 38°C, usually representing the immune system's response to infection or inflammation.

Understand what may be causing this

Reviewed by Internal Medical Editorial Team · Integrative Health Content Review26 March 2026High Evidence

Quick answer

Fever is an elevation in body temperature above the normal range (typically >38°C/100.4°F), representing an active physiological immune response. ICD-10: R50.9 (fever, unspecified); ICD-11: MG26. An important clinical sign requiring assessment for underlying cause.

Recognition

Do any of these feel familiar?

Fever produces a characteristic combination of feeling hot and cold simultaneously — shivering with high temperature is common and reflects the hypothalamus resetting its set-point upward. There is typically significant fatigue, aching, and malaise. Managing the discomfort of fever is important both for wellbeing and to maintain fluid intake.

What is Fever?

An elevation in body temperature above 38°C, usually representing the immune system's response to infection or inflammation.

Approaches Commonly Explored

Commonly explored for conditions related to Fever, grouped by mechanism — select your subtype above to highlight the most relevant path.

Integrates across:AlternativeComplementaryHolistic

How to use these approaches

🛡 Stabilise— Immediate relief

⚖️ Regulate— System balancing

🌱 Resolve— Root cause

✦ Sustain— Long-term

Most people begin with Stabilise approaches, then progress toward Resolve and Sustain.

Inflammatory Mechanism

Systemic or neuroinflammation and immune dysregulation.

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Fever

Do any of these feel familiar?

Approaches Commonly Explored

Paleo Diet

Occupational Therapy

Plant-Based Diet

Nutrition

Panchakarma

Nutrition Planning

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What You Can Do Now

This symptom is often connected to

Crohn disease

Diverticulitis

Rheumatoid arthritis

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About Fever

Integrative Approaches & Evidence

When to Seek Support

Frequently Asked Questions

References