What causes brain aneurysms to bleed?

What causes brain aneurysms to bleed?

Researchers haven’t discovered exactly what causes an aneurysm to leak or rupture, which causes bleeding in or around the brain. But anything that increases your blood pressure can be dangerous. Higher blood pressure makes blood push harder against blood vessel walls. Things that may increase blood pressure include:

• Ongoing stress or a sudden burst of anger or other strong emotion.
• Working hard to lift, carry or push something heavy like weights or furniture.
• Known high blood pressure that is not treated appropriately with medications.