MRI brain patient guide

Overview

An MRI (Magnetic Resonance Imaging) brain scan is a safe, painless test that uses strong magnets and radio waves to create detailed pictures of your brain. It helps doctors see your brain's structure and check for problems without using X-rays or radiation.

MRI brain scans are a routine test in hospitals and imaging centres. Millions are performed worldwide each year to help diagnose and monitor many different brain conditions.

Anyone may need an MRI brain scan if their doctor suspects a problem inside the skull. It is used for people of all ages, including children and older adults, though special preparation may be needed for young children or people who feel anxious in small spaces.

Symptoms

Common symptoms

• Headaches that are new, severe, or changing
• Blurred or double vision
• Weakness or numbness in an arm or leg
• Problems with balance or coordination
• Seizures or fits

Symptoms in children

• Developmental delays (slower than expected milestones)
• Frequent unexplained headaches
• Changes in vision or hearing
• Seizures

Symptoms in older adults

• Memory loss or confusion that is getting worse
• Sudden trouble speaking or understanding words
• Loss of balance or falls
• Vision problems that come on suddenly

Causes

Main causes

• An MRI brain scan is not caused by anything – it is a test to find the cause of symptoms.
• Common reasons for having the scan include suspected tumours, stroke, multiple sclerosis, infections, or bleeding in the brain.

Risk factors

• Having symptoms that suggest a brain problem (see ‘symptoms’ section)
• Having a family history of certain brain conditions (like brain tumours or aneurysms)
• Having a condition such as cancer that can spread to the brain

When to see a doctor

See a doctor urgently if:

• Sudden severe headache with stiff neck or fever
• Sudden weakness on one side of the body
• Sudden trouble speaking or understanding
• Sudden vision changes or loss

Book a routine appointment if:

• Headaches that happen often and are not relieved by over-the-counter treatments
• Mild confusion or memory problems that are slowly getting worse
• Dizziness or balance issues that come and go

Diagnosis

An MRI brain scan is a type of diagnostic imaging. Your doctor will refer you for the scan based on your symptoms, medical history, and a physical exam. The scan images are read by a radiologist (a doctor specially trained in imaging).

Tests that may be done

• MRI brain scan (sometimes with contrast dye injected into a vein)
• Sometimes a CT scan is done first if you cannot have an MRI

What to expect at your appointment

You will lie on a sliding table that moves into the MRI machine – a large tube open at both ends. You must keep very still. The machine makes loud banging and clicking noises. You will be given earplugs or headphones. A technologist watches you from another room and can talk to you through a microphone. The scan usually takes 30–60 minutes. You can go home straight after.

Treatment

Treatment depends entirely on what the MRI scan shows. The MRI itself does not treat anything – it provides information that guides your doctor. For many conditions, treatment may include medicines, procedures, or watchful waiting.

Self-care at home

• If you feel anxious about the scan, practice deep breathing or ask your doctor about ways to relax during the test.
• Follow any instructions you are given about eating or drinking before the scan (usually you can eat and take your normal medicines).
• After the scan, there is no recovery time needed – you can return to normal activities.

Medical treatments

Doctors use the MRI results to decide on treatments. For example, if a brain tumour is found, treatment may include surgery, radiation therapy, or medicines. For multiple sclerosis, treatment often involves medication to reduce flare-ups. For a stroke, treatment may include clot-dissolving medicines or procedures to restore blood flow. Your doctor will explain the options based on your specific findings.

When is surgery considered?

If the MRI shows a condition such as a brain tumour, aneurysm, or bleeding that requires surgical treatment, a neurosurgeon will discuss the options. Not all findings need surgery – many are managed with medicine or monitoring.

Living with this condition

If you have had an MRI brain scan and a condition is found, your day-to-day life will depend on that condition. The scan itself does not affect your daily activities. After the scan, you can drive, work, and do everything normally unless you had a sedative.

Lifestyle tips

• Follow your doctor’s advice on any necessary lifestyle changes based on the scan results.
• Keep a record of your symptoms to discuss with your healthcare team.
• Attend all follow-up appointments and scans as recommended.

Diet and exercise

There are no dietary restrictions after the MRI unless you were given a contrast dye (rarely you may be told to drink extra fluids). Exercise and normal diet are safe. If a brain condition is found, your doctor may give specific recommendations.

Mental health and emotional wellbeing

Waiting for MRI results or learning about a brain condition can be stressful. It is normal to feel anxious, worried, or overwhelmed. Talk to your doctor about your feelings, and consider reaching out to a counsellor or support group. You are not alone.

Prevention

There is no way to prevent needing an MRI brain scan – it is a diagnostic test. However, managing your overall health (blood pressure, cholesterol, not smoking) may reduce the risk of some brain conditions like stroke.

Vaccines

Some infections that affect the brain (like meningitis) can be prevented by vaccines. Ask your doctor if you are up to date on recommended vaccines.

Screening programmes

Routine screening MRI brain scans are not recommended for people without symptoms. However, if you have a strong family history of certain brain conditions, your doctor might suggest periodic scans.

Complications

If left untreated

• If a condition found on MRI is left untreated, it could worsen – for example, a tumour might grow, or a bleeding vessel might rupture.
• Delaying treatment for a stroke could lead to permanent brain damage.
• Some conditions (like multiple sclerosis) may progress faster without medication.

Long-term outlook

Most people who have an MRI brain scan either get normal results or find a condition that can be managed. Many brain conditions are treatable, and outcomes continue to improve with advances in medicine. Your doctor will give you a realistic and hopeful outlook based on your situation.

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