What Causes Brain Aneurysms?

The cause of Brain Aneurysms has not yet been identified. Although researchers have made advancements in understanding how Brain Aneurysms develop, it is unclear as to what exactly causes the disease. A number of factors can contribute to weakness in an artery wall and increase the risk of a brain aneurysm. Brain aneurysms are more common in adults than in children and more common in women than in men.  Some of these risk factors develop over time; others are present at birth.


  • Older age
  • Smoking
  • High blood pressure (hypertension)
  • Hardening of the arteries (arteriosclerosis)
  • Drug abuse, particularly the use of cocaine
  • Head injury
  • Heavy alcohol consumption
  • Certain blood infections
  • Lower estrogen levels after menopause


  • Family history of brain aneurysm, particularly a first-degree relative, such as a parent, brother or sister
  • Inherited connective tissue disorders, such as Ehlers-Danlos syndrome, that weaken blood vessels
  • Polycystic kidney disease, an inherited disorder that results in fluid-filled sacs in the kidneys and usually increases blood pressure
  • Abnormally narrow aorta (coarctation of the aorta), the large blood vessel that delivers oxygen-rich blood from the heart to the body
  • Cerebral arteriovenous malformation (brain AVM), an abnormal connection between arteries and veins in the brain that interrupts the normal flow of blood between them

Increased Risk Factors

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Studies have shown that smoking greatly increases the risk of potentially fatal Brain Aneurysm ruptures.

hypertension blood pressure test


Hypertension or high blood pressure have been shown to directly increase the risk of Brain Aneurysms

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Drug & Alcohol Abuse

Drug and alcohol abuse can inflame blood vessels, weaken arterial walls, and lead to the development of Brain Aneurysms