Understanding what a brain aneurysm is matters because it is a potentially life-threatening condition that can cause permanent brain damage or even death.
A brain aneurysm develops when a weak spot in a brain artery causes the vessel wall to balloon outward, forming an abnormal bulge. As the wall in that area continues to thin and weaken, it becomes increasingly susceptible to rupturing under normal blood pressure. Should that rupture occur, blood spills into the subarachnoid space, the narrow area between the brain and its surrounding membranes, causing what is known as a subarachnoid hemorrhage, a serious form of stroke.
There are several types of brain aneurysms. The most common is the saccular (berry) aneurysm , which typically forms at the branching points of arteries at the base of the brain. Other types include the fusiform aneurysm, which develops along a segment of an artery rather than at a single point, and the mycotic aneurysm which arises from an infection.
Brain Aneurysm Symptoms
In most cases, a brain aneurysm produces no symptoms during its development, symptoms typically only appear when it ruptures. However, in some cases, warning signs may be present beforehand.
Before rupture, possible symptoms include:
- An intense, localized headache, often described by patients as the worst headache of their life
- Visual disturbances, such as double or blurred vision, caused by pressure on the optic nerves
- Pain behind or around the eyes that is persistent and worsens over time. It is worth noting that a brain aneurysm does not typically cause eye hemorrhage and headache simultaneously, if both are present, the underlying cause should be investigated independently
- Depending on the aneurysm’s location, it may cause difficulty speaking or weakness and paralysis on one side of the body
After rupture, symptoms are far more severe and, in previously asymptomatic individuals, appear suddenly:
- A headache commonly described as a thunderclap, a sudden, explosive onset of intense pain
- Nausea and vomiting accompany the headache
- Neck stiffness
- Loss of consciousness
- Seizures in some cases
- Confusion or altered mental status due to disrupted blood supply to the brain
Causes and Risk Factors
In general terms, a brain aneurysm develops when the wall of an artery thins and weakens, often at points where arteries branch, though it can occur anywhere in the brain.
Several factors can contribute to this weakening:
- Hypertension: High blood pressure places excessive stress on blood vessel walls throughout the body, including those in the brain.
- Atherosclerosis: The buildup of plaque in the arteries is associated with an increased risk of aneurysm formation.
- Family history: People with close relatives, such as parents or siblings, who have had a cerebral aneurysm are at higher risk.
- Genetic disorders: Inherited conditions such as Ehlers-Danlos syndrome can weaken blood vessel walls.
- Smoking: Tobacco use is strongly associated with increased aneurysm risk due to the damage it causes to blood vessels.
- Age: Adults over 40 are at greater risk.
- Sex: Women are more prone to cerebral aneurysms than men.
- Head trauma: Injuries to the head can weaken arterial walls in the brain.
- Other conditions: Polycystic kidney disease, cerebral arteriovenous malformations, aortic coarctation, and certain infections, among others, can also predispose individuals to aneurysm development.
A common misconception is that stress directly causes aneurysms, but this is not the case. What stress can do is contribute to high blood pressure, tobacco and alcohol use, and an unhealthy lifestyle, all of which are independently recognized risk factors for brain aneurysms.
Dizziness, Headache, Blurred Vision, and Fatigue
While dizziness, headache, blurred vision, and fatigue are not exclusive symptoms of brain aneurysms, they are important warning signs that require immediate attention, especially when they appear suddenly or in combination.
If these symptoms occur, seeking emergency medical care without delay is essential. Time is a critical factor, both in determining the appropriate course of action and in minimizing the potential long-term consequences of this condition.
Diagnosis of a brain aneurysm requires a combination of neurological examination and imaging studies, including CT scans, MRI, and cerebral angiography.
Treatment depends on factors such as the aneurysm’s size, location, and rupture risk, and can range from monitoring and observation to surgical intervention or endovascular embolization. The appropriate course of action is determined on a case-by-case basis.
ABC Medical Center’s Neurology Center offers specialized care. If you have questions about brain aneurysms or are experiencing any of these symptoms, contact us today.
Fuentes: MedlinePlus, Stanford Childrens, Elsevier
