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What is a brain aneurysm and why is it dangerous?

Answer verified by LinQMD Care Team Last updated 04 Oct 2025
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A brain aneurysm is a weak, bulging spot on an artery in the brain, somewhat like a thin balloon. The danger is that an aneurysm can leak or rupture (burst open), causing bleeding in or around the brain – this is called a hemorrhagic stroke or subarachnoid hemorrhage, and it can be life-threatening. A ruptured aneurysm often causes a sudden, severe headache (“thunderclap headache”), loss of consciousness, or worse. Without treatment, a ruptured aneurysm can have devastating, life-changing consequences. The good news is that if we discover an aneurysm before it ruptures (for example, incidentally on a scan or due to warning symptoms), we can treat it to prevent a rupture. Even if it has ruptured, emergency treatment can save a life and often prevent further damage. In summary, a brain aneurysm is serious, but with early diagnosis and proper treatment, the chances of making a full recovery are quite good.

Dr. Murali Mohan S

About the Author

Dr. Murali Mohan S

Precision in Surgery. Passion in Innovation. Purpose in Care.

MBBS, Rajiv Gandhi University of Health Sciences, Karnataka, 2001

23+ Years in Neurosurgery 30000+ Patients | 8000+ Surgeries 4.9 ★

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