long lasting child fever

Overview

A fever is a body temperature higher than normal, usually 38°C (100.4°F) or higher. In children, when a fever lasts for more than a few days, often more than 5 days, it is called a long-lasting or persistent fever. It is a sign that the body's immune system is fighting an infection or another medical condition.

Yes, fevers are very common in children. Most are short-lived, but a fever that persists beyond a few days happens in a smaller number of children and may need a doctor's advice.

It can affect children of any age, from babies to teenagers. It is more concerning in babies under 3 months old because their immune systems are still developing.

Symptoms

Common symptoms

• Temperature above 38°C (100.4°F) or higher
• Feeling hot or flushed
• Sweating or shivering
• Fussiness or irritability
• Poor appetite
• Sleepiness or low energy

Symptoms in children

• Same as above
• In babies: fewer wet nappies, crying more than usual, not feeding well, feeling limp or floppy
• Older children may complain of headache or body aches

Causes

Main causes

• Viral infections, such as colds, flu, or common childhood illnesses like chickenpox
• Bacterial infections, such as ear infections, urinary tract infections, or strep throat
• Less often, inflammatory conditions or reactions to immunisations

Risk factors

• Young age, especially babies under 3 months old
• Not being fully vaccinated against preventable infections
• Being around other sick children, such as in daycare or school

When to see a doctor

See a doctor urgently if:

• If the fever lasts more than 5 days
• If the child is under 3 months old and has a fever
• If the child has a seizure, difficulty waking, or a stiff neck
• If the child has a severe headache or a rash that does not fade
• If the child is having trouble breathing

Book a routine appointment if:

• If the fever lasts more than 3 days in a child under 2 years old
• If the child is not drinking enough fluids or shows signs of dehydration
• If you are worried and want professional advice

Diagnosis

A doctor will ask about your child's symptoms, when the fever started, and any other signs. They will likely examine your child, including checking the throat, ears, skin, and overall alertness.

Tests that may be done

• A urine sample to check for a urinary tract infection
• Blood tests to look for signs of infection or inflammation
• Sometimes a chest X-ray if a chest infection is suspected
• Other tests may be done depending on your child's symptoms

What to expect at your appointment

The doctor will explain the likely cause and may suggest ways to keep your child comfortable. They might ask you to monitor the fever at home and return for a review, or they may arrange further tests. Always follow the healthcare provider's advice.

Treatment

Treatment focuses on finding and treating the underlying cause, while keeping your child comfortable. Most fevers do not need specific medical treatment, but some infections may require medication prescribed by a doctor.

Self-care at home

• Encourage your child to drink plenty of fluids, such as water, milk, or an oral rehydration solution, to prevent dehydration
• Let your child rest, but do not force them to stay in bed if they feel like gentle play
• Dress your child in light clothing and keep the room at a comfortable temperature
• Do not use cold sponging or cold baths—this is not recommended
• Monitor the temperature and other symptoms, but avoid giving any medicine without checking with a doctor or pharmacist first

Medical treatments

If a bacterial infection is found, the doctor may prescribe a course of antibiotics. Other treatments depend on the cause. For fever itself, the doctor may suggest a simple pain-and-fever reliever appropriate for the child's age and weight. Always give any prescribed medicine exactly as directed.

When is surgery considered?

Surgery is not needed for a long-lasting fever unless it is caused by a specific surgical condition, such as appendicitis. The doctor will discuss this if it applies.

Living with this condition

While your child has fever, keep them comfortable and watch how they are behaving more than the number on the thermometer. Keep a diary of temperature and any new symptoms to share with the doctor if needed.

Lifestyle tips

• Offer small, frequent drinks even if the child does not feel thirsty
• Serve light foods if they feel like eating, but do not force food
• Keep your child home from school or nursery until they are feeling better and fever-free for at least 24 hours, or as advised by your healthcare provider

Diet and exercise

Offer a normal balanced diet as tolerated, with plenty of fluids. There is no need to exercise while unwell; plenty of rest is important. When your child recovers, they can gradually return to normal activity.

Mental health and emotional wellbeing

A long-lasting fever can be worrying for both you and your child. Children may become miserable or frustrated, and it is normal for parents to feel anxious. Getting medical advice can reduce uncertainty. Look after your own well-being too—ask a partner or relative for help when needed.

Prevention

Not all causes of fever can be prevented, but good hygiene—such as regular handwashing, covering coughs, and keeping sick children away from others—can reduce the spread of infections.

Vaccines

Following the recommended vaccination schedule can protect your child against several infections that cause fever, such as measles, mumps, and whooping cough. Ask your doctor about routine childhood immunizations.

Screening programmes

There is no routine screening for fever, but regular well-child visits help track growth and development and give you the chance to discuss any concerns.

Complications

If left untreated

• Dehydration, especially if the child is not drinking enough fluids
• Febrile seizures—convulsions triggered by fever, which are usually brief but frightening
• Underlying infections may become more serious, such as a urine infection spreading to the kidneys

Long-term outlook

With proper care and medical guidance, most children with a long-lasting fever recover completely. Even when a cause is found, treatment is usually very effective. Talk to your doctor if you have concerns—there is a lot that can be done.

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