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Fever (Pyrexia)

Fever is usually the body's response to an illness or infection. The temperature matters, but age, how unwell someone looks, other symptoms, and how the illness is changing matter even more.

Traditional Homeopathic LiteratureReviewed: Sep 23, 2026

Editorial review complete

Independent clinical validation is pending.

Validation pending

Quick Reference Facts

System FocusGeneral
Clinical CharacterSubjective patient manifestation
Diagnostic UrgencyMonitor for red flag progress

In simple words

A fever is a temporary rise in body temperature, usually 38°C (100.4°F) or higher when measured with a thermometer. It is a symptom, not a diagnosis.

Clinical Meaning

Many fevers are linked with common viral illnesses, but the right next step depends on age, symptoms, health conditions, travel, medicines, and whether the person is improving or worsening.

Common Causes

  • A respiratory illness such as a cold, flu, sore throat, or chest infection
  • An infection affecting the stomach, urine, ear, skin, or another part of the body
  • A reaction to a vaccine or, less commonly, a medicine or inflammatory condition
  • Heat illness or another cause that needs a clinician to interpret in context

Clinical Red Flags

Seek urgent medical attention at an emergency department or primary care clinic if you present with any of the following symptoms:

  • Seek emergency care now for difficulty breathing, blue lips or face, new confusion, inability to wake, a seizure, a severe headache with stiff neck, or a rapidly worsening illness.
  • A fever with a new purple or bruise-like rash, severe dehydration, persistent vomiting, or severe pain needs urgent medical assessment.
  • A baby under 3 months with a temperature of 38°C (100.4°F) or higher needs prompt medical assessment. People who are pregnant, immunocompromised, receiving cancer treatment, or seriously unwell should seek advice early.

Lifestyle & Diet Support

For a familiar mild fever in an otherwise well adult or older child, rest, fluids, light clothing, and monitoring how the person feels can help. Follow the label or a clinician's advice for medicines; do not give aspirin to children or teenagers with a fever. Seek care if symptoms are not improving, are worsening, or any red flag appears.

Frequently Asked Questions

A temperature of 38°C (100.4°F) or higher is commonly treated as a fever, but body temperature changes through the day and the method of measurement matters. How the person looks and feels, their age, and other symptoms are important too.
Rest, fluids, light clothing, and keeping an eye on the overall pattern are sensible first steps. Use fever medicines only as directed on the label or by a clinician, and do not give aspirin to children or teenagers with a fever.
No. Many fevers are caused by viral illnesses, and antibiotics do not treat viruses. A clinician can decide whether testing or a particular treatment is needed from the symptoms, examination, and illness pattern.
A baby under 3 months with a temperature of 38°C (100.4°F) or higher needs prompt assessment. Get emergency help for breathing difficulty, blue lips or face, a seizure, confusion, inability to wake, a stiff neck with severe headache, or if you think something is seriously wrong.
Homeopathy should not replace assessment or evidence-based treatment for a concerning fever. In particular, it must never delay emergency help for warning signs or medical advice for infants, people who are immunocompromised, or anyone becoming more unwell.
Clinical & academic detailShow detail

Differential Diagnosis Matrix

Differential Diagnosis Overview

A thermometer cannot identify the cause of a fever by itself. A clinician may consider the pattern, examination, travel or exposure history, medicines, and tests when symptoms are severe, prolonged, recurrent, or unclear.

Reference Citations & Evidence Sources

Clinical Reviews & Textbooks
  • CIT-0127Clinical Review pending verification
  • CIT-0128Clinical Review pending verification

Clinical Connections

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