child fever MRI what to expect

Overview

An MRI (magnetic resonance imaging) is a safe, painless scan that uses a strong magnet and radio waves to create detailed pictures of the inside of the body. It does not use radiation. For a child with a fever, an MRI may be used when a doctor needs to look for infection or inflammation deep inside the body, such as in the brain, spine, or other organs. This article explains why an MRI might be done and how to help your child through the scan.

Most children with a fever do not need an MRI. Fevers are very common in childhood and are usually caused by mild infections that get better on their own. An MRI is only considered when a child has certain warning signs or a fever that does not go away, and a doctor suspects a deeper problem.

Children of any age can have an MRI if their doctor thinks it is needed. It is more likely to be considered for babies under 3 months with a fever, children who seem very unwell, have a weakened immune system, or have symptoms such as a severe headache, neck stiffness, or seizures.

Symptoms

Common symptoms

• Temperature of 38°C / 100.4°F or higher
• Chills and shivering
• Sweating or feeling hot
• Headache
• Muscle aches and weakness
• Loss of appetite

Symptoms in children

• Fussiness or irritability
• Feeding poorly or refusing to drink
• Sleepiness or hard to wake up
• Crying more than usual
• Breathing faster than normal
• A rash (especially one that doesn't fade when pressed)

Symptoms in older adults

• Confusion or change in thinking
• Weakness or difficulty moving
• Dizziness or falls
• Not having the energy to do usual activities

Causes

Main causes

• Viral infections, such as colds, flu, or roseola
• Bacterial infections, such as ear infections, throat infections, or urinary tract infections
• Inflammation in the body, such as from autoimmune conditions
• Reaction to vaccination (less common)
• Very rarely, serious conditions affecting the brain or other organs

Risk factors

• Age under 3 months
• A weakened immune system
• Recent surgery or medical procedures
• Travel to areas with certain infections
• Not responding to usual treatment
• Very high or persistent fever

When to see a doctor

See a doctor urgently if:

• Fever with a rash that does not fade
• Fever with neck stiffness or severe headache
• Fever with difficulty breathing
• Fever with a seizure
• Call your local emergency number for any of these

Book a routine appointment if:

• Fever lasting more than 3 days
• Very young baby (under 3 months) with any fever
• You are worried or something feels wrong
• Fever with pain, vomiting, or diarrhea that doesn't improve

Diagnosis

To find the cause of your child's fever, a doctor will start with a physical exam and ask about symptoms, recent travel, and medical history. Then they may order blood tests, urine tests, or a sample from the throat to check for infection. If these do not give a clear answer or if your child has warning signs, an MRI can create detailed images of the brain, spine, or other organs to look for infection, inflammation, or other problems.

Tests that may be done

• Blood tests to check for signs of infection
• Urine test (using a small bag or catheter)
• Throat or nasal swab
• Lumbar puncture (a small sample of spinal fluid) – only if a brain infection is suspected
• MRI scan – usually after other tests have been done

What to expect at your appointment

If your child needs an MRI, you will be asked to remove anything with metal, like jewelry or hairpins. Your child may need to wear a hospital gown. Because the scanner is very noisy, your child will wear ear protection. The scan takes 30 to 60 minutes and is painless, but your child must lie still. For this reason, younger children are often given sedation (medicine to make them drowsy) or, if needed, a general anaesthetic. You can often stay in the room with your child during the scan. The MRI team will guide you through every step.

Treatment

An MRI does not treat an illness – it helps doctors find the cause of symptoms. Once the MRI results are available, the doctor will use them together with other tests to decide on the right treatment. For most infections, treatment involves rest, fluids, and medicines to reduce fever and pain. Bacterial infections may need antibiotics. Your doctor will explain the options based on your child's specific condition.

Self-care at home

• Give your child plenty of fluids to prevent dehydration
• Keep your child comfortable and resting in light clothing
• Use a cool, damp cloth to help lower a high temperature
• Follow your healthcare provider's advice on when to give medicine for fever or discomfort

Medical treatments

Any treatment depends on the cause of the fever. Viral infections usually need no specific medicine – you can help with fluids and rest. Bacterial infections are treated with antibiotics prescribed by a doctor. If an MRI shows an abscess (a pocket of pus) or other build-up of fluid, a doctor may need to drain it. Your healthcare team will talk you through the best plan for your child.

When is surgery considered?

In rare cases where a collection of pus (abscess) is found inside the body, a small procedure or surgery may be needed to drain it. This is not common, and your child's doctors will explain if this is appropriate.

Living with this condition

After the MRI, most children can return to normal activities as soon as they feel well. If sedation was used, your child may be drowsy for a few hours. Follow-up appointments will help track recovery and manage any lingering symptoms.

Lifestyle tips

• Keep giving your child extra fluids while they recover
• Ensure they get plenty of rest
• Monitor their temperature and watch for any new symptoms
• Keep your home smoke-free – secondhand smoke can make breathing problems worse

Diet and exercise

A gentle diet with soups, fruit, and toast can help if your child has a poor appetite. Let your child decide how much to eat. Encourage light activity as they feel able – they do not need to stay in bed but should take it easy until the fever is gone.

Mental health and emotional wellbeing

Seeing your child with a fever can be worrying, especially when a scan like an MRI is involved. Children can be scared of the machine, but knowing what to expect and staying calm makes a big difference. It can help to use child-friendly language – for example, describing it as a 'big camera that takes photos of your body' – and to bring comfort items like a favourite toy.

Prevention

Not all fevers can be prevented, but many infections that cause fevers can be reduced with good hygiene, like frequent handwashing, and by avoiding close contact with people who are ill. Routine childhood vaccines are one of the best ways to protect against serious infections.

Vaccines

Make sure your child is up to date with routine vaccinations. This helps prevent many illnesses that cause fever, such as flu, pneumonia, and meningitis. Ask your local health service about the schedule for your area.

Complications

If left untreated

• If a serious bacterial infection (such as meningitis or an abscess) is not treated in time, it can lead to severe illness, brain damage, or other long-term problems.
• Dehydration can develop if a child cannot drink enough fluids.
• Very high fever can sometimes cause a seizure (febrile seizure), which is usually brief but requires emergency care.

Long-term outlook

Most children with fever recover fully and quickly. When an MRI is needed, it is usually because doctors want to rule out or detect a serious condition early. With the right treatment and care, most children go on to live healthy lives. The MRI is an important step in making sure your child gets the right help.

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