Fever what it can mean

Overview

Fever is a temporary rise in body temperature, usually caused by an infection. It is the body's natural way of fighting germs and helping the immune system work better.

Fever is very common. Nearly everyone gets a fever at some point, especially during childhood.

Fever can affect people of all ages, but it is most common in children under 5 years old and in older adults, whose immune systems may be less strong.

Symptoms

Common symptoms

• High temperature (usually over 38°C or 100.4°F)
• Chills and shivering
• Sweating
• Headache
• Muscle aches
• Weakness or tiredness

Symptoms in children

• May have a higher fever than adults
• Irritability or fussiness
• Poor eating or feeding
• Vomiting or diarrhea

Symptoms in older adults

• Fever may be lower but still important
• Confusion or drowsiness
• Weakness and loss of appetite

Causes

Main causes

• Viral infections, such as the common cold, flu, or COVID-19
• Bacterial infections, such as a sore throat, ear infection, or urinary tract infection
• Inflammatory conditions like arthritis
• Reaction to some vaccines
• Heat exhaustion from being too hot

Risk factors

When to see a doctor

See a doctor urgently if:

• Any emergency symptoms listed above
• Fever in an infant under 3 months old
• Fever with a stiff neck or severe headache
• Fever that causes a seizure

Book a routine appointment if:

• Fever that lasts more than 3 days in an adult

Diagnosis

The doctor will ask about your symptoms, recent travel, and any contact with sick people. They will take your temperature and do a physical exam to look for signs of infection.

Tests that may be done

• Temperature measurement (using an ear, forehead, or mouth thermometer)
• Blood tests (to check for infection markers)
• Urine test (to check for urinary tract infection)
• Throat swab (to test for strep throat)
• Chest X-ray (if chest infection is suspected)

Treatment

The main goal is to treat the underlying cause, not the fever itself. Fever fights infection, so treating it may actually slow recovery. You usually only need to treat a fever if it makes the person very uncomfortable.

Self-care at home

• Rest and stay at home until you feel better
• Drink plenty of fluids (water, soup, clear drinks) to stay hydrated
• Wear light clothing and keep the room at a comfortable temperature
• Use a damp cloth or sponge on your forehead or wrists for comfort (do not use ice water)
• Avoid alcohol and caffeine

Living with this condition

Monitor your temperature and symptoms. Most fevers last 1–3 days. Take it easy, rest, and don't push yourself. If you have a fever, avoid going to work or school until it has gone away for at least 24 hours (without using fever reducers) to avoid spreading infection.

Lifestyle tips

• Stay home while you have a fever
• Avoid strenuous exercise
• Keep a thermometer on hand to track temperature
• Wash hands often to prevent spreading germs to others

Diet and exercise

You don't need to starve a fever. Eat light, easy-to-digest foods like toast, crackers, or soup. Drink extra fluids – water, broth, or diluted fruit juice. When the fever passes, you can gradually return to normal activities.

Mental health and emotional wellbeing

Prevention

Not all fevers can be prevented, but you can reduce your risk of infections by practicing good hygiene, such as frequent handwashing and avoiding close contact with sick people.

Vaccines

Some vaccines protect against infections that cause fever, such as the flu vaccine, measles vaccine, and pneumococcal vaccine. Speak to your healthcare provider about recommended vaccinations.

Screening programmes

There is no routine screening for fever itself. Screening may be done for certain infections (like tuberculosis) if you are at higher risk, but this is not standard for fever alone.

Complications

If left untreated

• Febrile seizures in children (rare, but can be scary – they usually stop on their own and do not cause long-term harm)
• Dehydration from not drinking enough fluids
• Worsening of the underlying infection if it is bacterial and not treated

Long-term outlook

The outlook for fever is excellent. Most fevers are short-lived and end with full recovery. The fever itself is part of the healing process. Even when a fever is a sign of a more serious illness, early medical care leads to better outcomes. There is always hope and help available.

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