Fever

Fever is a natural immune response where the body temporarily raises its temperature—usually above 38°C—to help fight infections or illness by slowing germ growth and boosting the immune system. Consult online doctors & get medical advice 24/7.

When to consult a doctor for fever?

If the fever is high or lasts several days

See a doctor if your fever lasts more than three days or is very high (above 39.4°C or 103°F), as this may indicate a more serious infection.

If severe or unusual symptoms occur

Seek medical attention if the fever is accompanied by chest pain, difficulty breathing, persistent vomiting or diarrhoea, severe headache, neck stiffness, confusion, or seizures.

If you are at higher risk or symptoms worsen

Consult a GP if the fever occurs in an infant under three months old, if you have a weakened immune system or chronic illness, if you’ve recently travelled abroad, or if the fever continues to worsen over time.

This guide does not replace professional care. Consult a doctor to manage your symptoms. In emergencies, call 000. The content is research-backed & medically reviewed. by Dr. Ammar AL-ANI, MBChB, CCBST, AMC

Causes

It is important to understand the underlying cause of the fever to diagnose and treat it correctly. Here are some common types of fever:

Viral infections: Such as colds, flu, COVID-19, and other respiratory infections.
Bacterial infections: Such as tonsillitis, pneumonia, and urinary tract infections.
Chronic illnesses: Such as rheumatoid arthritis and ulcerative colitis, which can lead to prolonged fevers.
Tropical diseases: Such as malaria, dengue, and typhoid fever, often cause recurring fevers.
Heat stroke: Can cause very high body temperature without sweating. Heat stroke is a medical emergency — call 000 immediately if suspected.
Medication reactions: Some individuals may experience fevers as a side effect of specific drugs.
Others: Some other fevers are found in Australia such as Q Fever or Australian spotted fever (Tick bites).

Warning signs for child fever

When it comes to fever in children or fever in babies, it’s essential to consult a doctor if:

A baby under three months has a fever above 38°C

A baby between three to six months has a fever or appears unusually irritable, lethargic, or uncomfortable.

The fever lasts more than three days

Your child shows signs of dehydration, difficulty breathing, persistent vomiting or diarrhoea, rash, or is unusually sleepy or unresponsive.

The fever is accompanied by a seizure, stiff neck, or severe headache.

Telehealth assessment for fever

Hola Health provides a convenient way to consult an AHPRA-registered doctor online, 24/7 across Australia.

Clinical note: A telehealth assessment can help evaluate fever symptoms, provide management advice, and issue prescriptions or referrals if clinically indicated. Telehealth is appropriate for mild to moderate fevers where emergency presentations have been excluded. Fever cannot be directly measured via telehealth — assessment relies on the temperature readings and symptoms reported by the patient. Fever in an infant under three months, fever accompanied by seizures, neck stiffness, severe headache, confusion, difficulty breathing, or a non-blanching rash requires emergency care — call 000 or attend an Emergency Department immediately. Do not use telehealth for these presentations. We recommend sharing your consult summaries with your regular GP to ensure continuity of care.

Frequently Asked Questions

Is fever contagious?

No. Fever itself is not contagious. But the infection causing it, such as flu or gastro, often is. You can’t catch a fever from someone else, but you can catch the infection that’s causing it.

What temperature is considered a fever?

In Australia, a temperature of 38 °C or above is generally considered a fever. Normal body temperature varies between people, but is usually around 36.5 °C to 37.5 °C.

How can I overcome weakness after a fever?

Rest, hydration, and gentle movement help in recovery. Eat nourishing food and gradually return to normal activity. Weakness after a fever usually improves within a few days.

How can I reduce my fever at home?

Drink plenty of fluids to stay hydrated and get sufficient rest. Wear light, comfortable clothing and keep the room comfortably cool. Over-the-counter options may help manage to lower a fever and ease discomfort. Always follow the dosing instructions and see a doctor if the fever is high, persistent, or accompanied by other warning signs.