Signs and symptoms
... An unruptured brain aneurysm may produce no symptoms, particularly if it''s small. However, a large aneurysm may press on brain tissues and nerves, possibly causing a droopy eyelid or double vision. O...

Causes
... Most brain aneurysms develop as a result of the wear and tear on arteries that comes with aging. Recent research indicates that brain aneurysms aren''t present at birth (congenital), as once was commo...

Risk factors
... If one or more family members had a brain aneurysm, you''re at increased risk. Other factors that may contribute to developing a brain aneurysm or increase the risk of rupture include: Smoking. Among ...

When to seek medical advice
... Because a ruptured brain aneurysm can be life-threatening, seek immediate medical attention if you develop a sudden, extremely severe headache, particularly if it''s accompanied by other signs or symp...

Screening and diagnosis
... An aneurysm is likely to go undetected until it either ruptures or shows up on a brain imaging test that you might undergo for another condition. However, after an aneurysm has ruptured, there are a n...