Brain aneurysm

Key facts A brain aneurysm is a bulge in an artery in your brain. If an aneurysm leaks or bursts, it can cause a stroke (bleeding on your brain). Many people have a brain aneurysm without realising it. What is a brain aneurysm? A brain aneurysm — cerebral aneurysm or berry aneurysm — is a bulge in an artery in your brain. It’s caused by a weak spot in your artery wall. If a brain aneurysm leaks or bursts, it can cause haemorrhagic stroke (bleeding on your brain). This can quickly become life threatening. About 2 people in 100 have a brain aneurysm. Some