A brain aneurysm is usually diagnosed using an MRI scan and angiography (MRA), or a CT scan and angiography (CTA).
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Brain aneurysms are usually treated with surgery if they have burst or there's a risk they will burst.
It's not clear what causes brain aneurysms. You're more likely to get them if you smoke, have high blood pressure or have family members with them.
Symptoms of a brain aneurysm can include headaches or changes in your vision. If it bursts, it can cause a sudden and very severe headache.
Page last reviewed: 16/08/2018
Next review due: 16/08/2021