General symptoms
This page groups content about fever as a general symptom, one of the most common reasons people seek medical advice. Fever is broadly defined as a body temperature above the normal range, with 38 degrees C (100.4 degrees F) widely used as a reference threshold, though the value that applies in any individual case depends on the measurement site, the method used, and the person’s age.
This information is general and cannot diagnose any condition. It does not replace an assessment by a qualified health professional. A single symptom, including fever, cannot identify a specific disease on its own; only a clinician can evaluate your situation.
Symptoms in this category
- Fever - a body temperature that may be above the normal range for the individual, often accompanied by sensations of heat, chills, or sweating.
How to describe these symptoms in a consultation
- Temperature readings - note the value, the measurement site (mouth, ear, armpit, forehead), and the device used.
- Duration - when the symptom first appeared and whether it has been constant or intermittent.
- Pattern - whether temperature rises at certain times of day or after specific activities.
- Associated symptoms - any other changes noticed at the same time, such as cough, pain, rash, or fatigue.
- Context - recent travel, contact with illness, known health conditions, or medicines currently being taken.
When to seek care
Consult a health professional if a fever persists, keeps returning without a clear cause, or is accompanied by symptoms that concern you. A clinician can assess whether further investigation is needed.
Seek emergency care without delay - call your local emergency number or go to an emergency department - if any of the following are present:
- A very high temperature in infants, young children, or older adults
- Stiff neck, severe headache, or sensitivity to light alongside fever
- Difficulty breathing, chest pain, or persistent vomiting
- Confusion, difficulty staying awake, or loss of consciousness
- A rash that spreads rapidly or does not fade when pressed
- Fever in a baby under three months old
- Any situation where the person’s condition is deteriorating quickly
If you are unsure whether your situation requires emergency attention, err on the side of seeking care promptly. The guidance on this page is general information only and is not a substitute for professional medical advice.
Pages in this Category
- Loss of appetite: what it is and when to seek care
Learn what loss of appetite means, how clinicians assess it, possible causes, and when to seek professional care for this common symptom.
- Fever: what it is and when to seek care
An educational overview of what a fever is, how clinicians characterize it, possible causes, and when to seek professional care.
- Dehydration: what it is and when to seek care
Learn what dehydration means, how clinicians characterize it, what may cause it, and when to seek medical care for this common but variable condition.
- Generalized weakness: what it means and when to seek care
Learn what generalized weakness means, how clinicians assess it, which situations need urgent care, and how to describe it clearly at your appointment.