Being told there are “white spots” on your brain MRI is unsettling — but in most cases they are common, often-incidental findings, and not a sign of anything dangerous.
White spots (doctors call them white-matter lesions or hyperintensities) show up brightly on certain MRI sequences. They become more common with age, and there are a few quite different causes — which is why the pattern matters far more than simply their presence. This page explains what they are, what causes them, what they mean, and when they need a closer look.
Often white spots are incidental findings — picked up on a scan done for another reason, such as headaches or dizziness. On their own, a small number of spots is usually nothing to worry about.
What causes white spots on a brain MRI?
There are three common explanations. They tend to look different — in shape, size and location — which helps a neurologist tell them apart.
🩸 Small-vessel (vascular) changes
The most common cause with age. These “stroke-like” changes relate to the same risk factors as stroke — high blood pressure, high cholesterol, diabetes and smoking — and are worth identifying so those factors can be managed.
🤕 Migraine
People who have migraine commonly show small white spots (sometimes called “UBOs” — unidentified bright objects). These are benign, do not mean MS, and usually need no specific treatment beyond managing the migraine itself.
🛡️ Inflammation (autoimmune)
A range of autoimmune conditions — from Sjögren’s syndrome and lupus to multiple sclerosis — can cause white spots. These tend to have a characteristic shape and location, and are investigated differently.
What do they mean? Should I worry?
It depends on how many there are, their pattern, and your symptoms. A small number of spots is usually asymptomatic and causes no problems. If small-vessel changes accumulate over years they can contribute to changes in thinking, memory and walking speed, and are a marker of increased stroke risk — which is exactly why managing blood pressure, cholesterol and the other risk factors matters.
The presence of a few white spots does not mean you have MS or dementia. Context is everything — most are explained by age, blood-vessel health or migraine.
If the spots are vascular: lowering your future stroke risk
When white spots are the small-vessel (vascular) type, they are a useful warning sign — they tell us the brain’s small blood vessels have been under strain from the same factors that cause stroke. The good news is that almost all of these factors can be treated, and acting on them genuinely lowers the risk of a future, more serious stroke. This is one of the most important parts of the assessment.
Controlling the risk factors
We review and help manage the modifiable contributors that drive both white-matter change and stroke:
- Blood pressure — the single biggest driver of small-vessel change
- Cholesterol — including starting or optimising a statin where appropriate
- Diabetes and blood-sugar control
- Smoking, and where relevant weight, exercise and alcohol
Looking for a treatable source of stroke
Just as importantly, we look for a specific, treatable source of stroke risk — because finding one can change treatment entirely and prevent a future stroke:
- Arterial atheroma — narrowing or plaque in the carotid and other arteries, assessed with a carotid ultrasound (and CT or MR angiography if needed). Significant narrowing can sometimes be treated directly to prevent a stroke.
- Embolic (cardiac) sources — an irregular heart rhythm such as atrial fibrillation is a major but very treatable cause of stroke. We arrange heart-rhythm monitoring (ECG and longer Holter or event monitoring) and, where relevant, an echocardiogram to look at the heart itself.
Finding and treating these — high blood pressure, a narrowed artery, or an irregular heart rhythm — is one of the most effective things in all of medicine for preventing a future stroke.
When are white spots investigated further?
When the pattern suggests inflammation rather than vascular change — for example lesions in particular locations, or in a younger person with relevant symptoms — a more detailed look is warranted. That may include a dedicated MRI protocol (sometimes with contrast), blood tests, eye tests, and occasionally a lumbar puncture.
In that situation a neuroimmunology assessment helps pin down the cause — including conditions such as multiple sclerosis and NMOSD. At East Neurology this is provided by Dr Tal Koren, alongside Dr Ron Granot.
Frequently asked questions
Are white spots on the brain dangerous?
Usually not. A small number of incidental white spots is common, particularly with age or migraine, and often causes no problems. What matters is the pattern, the number, and whether you have symptoms — which is what a neurologist assesses.
Do white spots mean I have MS?
No — most white spots are not due to MS. MS lesions have a characteristic shape and location, and the diagnosis depends on the clinical picture plus specific MRI and other findings, not on white spots alone.
Can migraine cause white spots on an MRI?
Yes. People with migraine commonly have small white-matter spots. They are benign and do not require specific treatment beyond managing the migraine.
Can white spots go away?
Vascular and migraine-related spots generally persist but often remain stable. Inflammatory lesions can change over time, which is one reason the pattern and any change are assessed carefully.
Should I be worried about an incidental finding?
An incidental finding means it was not what the scan was looking for. Most are benign, but it is reasonable to have a neurologist review the images and your risk factors for peace of mind and to guide any sensible follow-up.
Concerned about white spots on your MRI?
A neurologist can review your scan and symptoms, identify the likely cause, and advise whether anything further is needed. Ask your GP for a referral to East Neurology, Bondi Junction, then get in touch.
Or call 02 9388 0615. East Neurology is a private specialist practice focused on expert diagnosis and prompt results; your Medicare rebate is processed for you on the day.