system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What actually happens when you suffer a brain aneurysm, and how does this result in death?
gpt
A Blood vessel ruptures causing bleeding into the brain (hemorrhagic stroke). Most often a ruptured brain aneurysm occurs in the space between the brain and the thin tissues covering the brain. 
The blood can cause direct damage to surrounding cells, and the bleeding can damage or kill other cells. It also increases pressure inside the skull.
If the pressure becomes too elevated, the blood and oxygen supply to the brain may be disrupted to the point that loss of consciousness or even death may occur.