Brain Aneurysms: Symptoms, Causes, Diagnosis & Treatment

A brain aneurysm is a serious medical condition characterized by a protruding or weakened spot in a blood vessel in the brain. They commonly form due to weak spots in arterial walls where blood pressure applies continual stress. 

Brain Aneurysms

When this area balloons out, the wall of the vessel becomes fragile and susceptible to rupture, which can be life-threatening. While small aneurysms may not cause problems, recognizing the symptoms of a brain aneurysm and seeking prompt treatment is critical in preventing severe complications. 

Various factors contribute to the formation of brain aneurysms, with some individuals having a higher risk due to genetic predispositions or lifestyle choices. Accurate and timely diagnosis is crucial in determining the best course of action.

genetic predispositions

Emphasizing prevention and effective management strategies can significantly reduce the likelihood of experiencing an aneurysm or handling its complications.

Symptoms of Brain Aneurysms

Symptoms of a brain aneurysm can include sudden and severe pain, changes in vision, difficulty in speech, and seizures. However, as previously mentioned, many aneurysms are asymptomatic.

Symptoms of Brain Aneurysms

Unruptured Aneurysms

An unruptured brain aneurysm might not cause symptoms, but some people might experience warning signs such as headaches, double vision, changes in the size of one pupil, and numbness or weakness on one side of the face or body. 

These symptoms can occur as the aneurysm puts pressure on nearby nerves or tissues. 

Unruptured Aneurysms

It’s essential to seek medical attention if you experience these symptoms, as early diagnosis and treatment could prevent the aneurysm from rupturing.

Ruptured Aneurysms

When a brain aneurysm ruptures, it can be life-threatening, and the sudden onset of symptoms requires immediate medical attention. 

Ruptured Aneurysms

Some common symptoms of a ruptured brain aneurysm include intense headache, stiff neck, nausea, and vomiting.

double vision

Eye-related symptoms are also observed and reported, such as vision changes (blurred or double vision), a dilated pupil in one eye, and sensitivity to light.

loss of consciousness

Symptoms affecting cognitive function include confusion and, at times, loss of consciousness.


In some cases, people may also experience numbness or weakness on one side of the body, leading to difficulty moving or speaking. 

call emergency medical services

If you suspect a ruptured brain aneurysm, call emergency medical services immediately, as timely treatment could significantly improve the chances of recovery.

Causes and Risk Factors

Identifying these factors not only help in risk assessment but also in tailoring treatment approaches for affected individuals.

These contributing elements can range from genetic predispositions to lifestyle habits.

Genetic Factors

Certain genetic factors can increase the risk of developing a brain aneurysm. People with a family history of brain aneurysms are at a higher risk, especially if there is a first-degree relative (parent, sibling, or child) with a history of cerebral aneurysms. 

Genetic Factors

Some hereditary conditions, such as polycystic kidney disease and Ehlers-Danlos syndrome, also increase the likelihood of developing brain aneurysms. Individuals with coarctation of the aorta or arteriovenous malformation are at higher risk as well.

Lifestyle Factors

Several lifestyle factors contribute to the formation and growth of brain aneurysms. 

High blood pressure is a significant risk factor, as it puts increased long-term stress on the walls of blood vessels, potentially weakening them and causing an aneurysm to form. 

Lifestyle Factors

Smoking is another risk factor, as it can damage blood vessels and increase the risk of aneurysm formation.


Alcohol use, particularly heavy drinking, can contribute to atherosclerosis, a condition in which fatty deposits build up in the arteries, increasing the risk of aneurysms. 

Cocaine use has also been linked to the development of brain aneurysms, as it can cause blood vessels to be narrow, increasing blood pressure and the risk of aneurysm formation.

In addition to these lifestyle factors, individuals with certain connective tissue disorders, such as Marfan syndrome or Loeys-Dietz syndrome, may be at an increased risk.

Loeys-Dietz syndrome

Ensuring a healthy lifestyle and managing any existing conditions can help reduce the risk of aneurysm formation and growth.

Types of Brain Aneurysms

An accurate understanding of the different types of brain aneurysms is essential for effective diagnosis and treatment planning. Each type has its unique characteristics, including shape and location.

Saccular Aneurysms

The most common type of brain aneurysm is termed ‘Saccular aneurysm.’ They resemble a dome shape and are connected to the artery by a narrow “neck.”

Saccular Aneurysms

These aneurysms form a pocket on the exterior of a brain artery, and they are frequently found at the base of the brain. Saccular aneurysms can remain asymptomatic for a long time, but if they rupture, it can lead to life-threatening complications like subarachnoid hemorrhage or hemorrhagic stroke.

Fusiform Aneurysms

Fusiform aneurysms are less common than saccular aneurysms. They are characterized by a uniform widening of the artery wall, forming a spindle-like shape. 

Fusiform Aneurysms

These aneurysms occur due to a weakening of the entire circumference of the blood vessel, and they do not have a neck-like saccular aneurysm. Fusiform aneurysms are more likely to develop in large arteries of the brain, and they are less likely to rupture than saccular aneurysms. However, when they rupture, they can cause serious complications.

Mycotic Aneurysm

Mycotic aneurysms are a rare form of brain aneurysm caused by an infection in the blood vessel wall.

Mycotic Aneurysm

They typically result from a bacterial infection, which can lead to the formation of pus and weakened blood vessels. Mycotic aneurysms can develop anywhere in the brain and can even occur in multiple blood vessels simultaneously. These aneurysms are more prone to rupture compared to other types due to the weakened vessel wall, leading to potentially life-threatening complications.

Diagnosis of Brain Aneurysms

In order to accurately diagnose a brain aneurysm, doctors employ a variety of imaging techniques and procedures. 

Diagnosis of Brain Aneurysms

Imaging Techniques

There are several imaging methods that help identify and locate brain aneurysms. Some of these techniques include 

Magnetic Resonance Imaging (MRI): 

An MRI provides detailed images of the brain using magnetic fields and radio waves. It is a non-invasive procedure often used to identify unruptured aneurysms.

Computed Tomography (CT) scan: 

A CT scan uses X-rays to create cross-sectional images of the brain. 

Computed Tomography (CT) scan

This technique is commonly used to detect blood in the area surrounding the brain due to a ruptured aneurysm.

CT Angiogram: 

This specialized CT scan involves injecting a contrast dye into the blood, allowing for detailed images of the brain’s blood vessels to be created. It is often recommended for rapid evaluation, especially in emergency settings. 

Cerebral Angiogram

Also known as cerebral angiography, this procedure involves injecting a contrast dye into the blood vessels and using X-ray images to visualize the blood flow in the brain. This method is particularly useful for locating small aneurysms or planning surgical procedures.

Cerebral Angiogram

Magnetic Resonance Angiography (MRA): 

Similar to an MRI, MRA uses magnetic fields and radio waves to visualize blood vessels in the brain and detect abnormalities, such as aneurysms.

Lumbar Puncture

A lumbar puncture, also known as a spinal tap, is a procedure performed to diagnose a ruptured brain aneurysm. 

Lumbar Puncture

This technique involves inserting a thin needle into the lower back to collect cerebrospinal fluid (CSF) surrounding the spinal cord. If there is blood present in the CSF, it can indicate a ruptured aneurysm and subsequent subarachnoid hemorrhage. 

Lumbar puncture is typically employed when imaging techniques cannot conclusively identify the presence of a ruptured aneurysm.

lumber puncture

Treatment Options

The selection of treatment depends on factors based on the evaluation of the healthcare team, which includes the size, location, current condition, and shape of the aneurysm, in addition to the patient’s overall health and preferences. 

In some cases, a combination of treatments may be used.

Endovascular Treatment

Endovascular treatment is a minimally invasive procedure used to treat both ruptured and unruptured brain aneurysms. 

Endovascular Treatment

Aneurysm Coiling

One common method is Aneurysm coiling, which involves inserting a catheter into the aneurysm and filling it with soft platinum coils to prevent blood flow and promote clotting. 

Flow Diversion

Another endovascular option is flow diversion, which uses a stent-like device to divert blood flow away from the aneurysm and encourage healing. The device is positioned across the neck of the aneurysm and aids in the restoration of normal blood flow in the parent artery.

Flow Diversion

Surgical Clipping

Surgical clipping is a more invasive treatment option, typically reserved for ruptured aneurysms or unruptured aneurysms with a high risk of rupture. 

To access the aneurysm, the procedure entails making an incision in the skull and then positioning a small metal clip around the aneurysm’s neck to prevent blood flow and rupture.

Both endovascular treatment and surgical clipping carry risks, such as infection, complications from anesthesia, and damage to nearby blood vessels. 

Surgical Clipping

Prevention and Management

From lifestyle modifications to medical interventions, multiple avenues are available to help you prevent the development or rupture of an aneurysm.

Lifestyle Modifications

One of the key components in the prevention and management of brain aneurysms is adopting a healthy lifestyle. These changes can help reduce risk factors and maintain overall cardiovascular health.

Lifestyle Modifications

Engaging in regular exercise, like walking, swimming, or biking. These exercises can improve your heart and blood vessel health, which lowers the risk of developing an aneurysm.


Eating a well-balanced diet that is low in saturated fat and cholesterol and rich in vegetables, fruits, and whole grains promotes good cardiovascular health.


This diet reduces the chances of aneurysm development.

Quitting smoking: 

Cigarette smoking is a major risk factor for brain aneurysms.

Quitting smoking

Quitting smoking will significantly decrease the risk of developing one or experiencing a rupture.

Limiting alcohol consumption: 

Excessive alcohol consumption may increase blood pressure, thus raising the risk of developing an aneurysm. 

Limiting alcohol consumption

Moderating alcohol intake can help manage this.

Stress reduction: 

Stress management is a critical element in the prevention and control of brain aneurysms. Elevated stress levels can contribute to increased blood pressure, a known risk factor.

Stress reduction

Practicing stress management techniques, like meditation, yoga, mindfulness, and deep breathing exercises, can help lower blood pressure and reduce the risk of an aneurysm.

Avoiding illicit drug use: 

The use of illicit drugs, like cocaine, can increase blood pressure and the risk of an aneurysm.

Avoiding illicit drug use

Staying away from these substances is essential for aneurysm prevention.

Medical Monitoring

For individuals with brain aneurysms or those at high risk, regular medical monitoring and proper management are crucial.

Blood pressure control: 

Hypertension is a significant risk factor in aneurysm development. 

Blood pressure control

Keeping blood pressure within a healthy range with lifestyle changes and medications can help reduce the risk.


People with a family history of brain aneurysms are at a higher risk of developing one. 


Regular screening, such as brain imaging, can help in early detection and intervention.


Depending on your medical history and specific risk factors, your doctor may prescribe medications to manage your overall health and reduce the risk of an aneurysm. This may include blood pressure-lowering drugs, cholesterol-lowering drugs, or medication to prevent blood clots.


Prognosis and Mortality

Understanding these topics can offer valuable perspectives, aiding in treatment decisions and mental preparation.

Short-Term Outcomes

The short-term prognosis of a brain aneurysm depends on the size, condition, and location of the aneurysm, as well as the overall health of the individual. 

Small aneurysms might not cause any symptoms and be manageable by follow-up monitoring for changes. However, when a brain aneurysm ruptures, it is a life-threatening event that can lead to a hemorrhage, seizures, or death.

Short-Term Outcomes

One of the severe consequences of a ruptured aneurysm is a subarachnoid hemorrhage, which entails bleeding in the space between the brain tissue and the meninges. This condition may also lead to a hemorrhagic stroke. 

Prompt medical attention is critical in such cases. According to studies, around 40% of ruptured aneurysm cases result in death within 24 hours of rupture, and about 15% of these people die before reaching the hospital.

40% mortality within 24 hours post-rupture

Long-Term Outcomes

The long-term prognosis for individuals with brain aneurysms can vary. For small aneurysms that are monitored and managed, the risks can be relatively low. 

However, those who have experienced a ruptured aneurysm might face more severe consequences. Approximately 50% of individuals who survive a ruptured aneurysm die due to complications within three months from the initial date of rupture. Around 65% of survivors of the rupture may suffer from long-lasting effects: cognitive difficulties, speech problems, or physical disabilities.

Long-Term Outcomes

Regular check-ups with a healthcare provider, along with follow-up imaging, are crucial for monitoring the condition and ensuring a more favorable prognosis.

Frequently Asked Questions

What are the early warning signs of a brain aneurysm?

Some of the early warning signs of a brain aneurysm include sudden, severe headache, loss of consciousness, blurred or double vision, weakness or numbness on one side of the body, and difficulty speaking. 

What are the early warning signs of a brain aneurysm

However, not all brain aneurysms present symptoms, and some may go unnoticed until they rupture or are detected during imaging tests for other conditions.

What is the main cause of a brain aneurysm?

This condition typically arises from a weak spot in the wall of an artery inside or surrounding the brain. The constant pressure of blood flow within the weakened artery can cause the vessel’s wall to bulge outward and form an aneurysm.

What is the main cause of a brain aneurysm

Factors contributing to the development of aneurysms include high blood pressure, smoking, genetic predispositions, and certain inherited disorders.

How long can an aneurysm exist without detection?

An undetected aneurysm can exist for years or even a lifetime. Many unruptured aneurysms do not cause symptoms and are discovered incidentally during imaging tests for unrelated conditions. 

How long can an aneurysm exist without detection

If a brain aneurysm is detected but has not ruptured, medical professionals will monitor its size and progression and recommend appropriate treatment options.

What is the best way to prevent brain aneurysms?

The best way to prevent brain aneurysms is to maintain a healthy lifestyle by focusing on risk factor modification. 

Some suggestions are managing high blood pressure, quitting smoking, exercising regularly, eating a balanced diet, and avoiding excessive alcohol consumption.

What is the best way to prevent brain aneurysms

What are the treatment and recovery options for brain aneurysms?

The treatment options for brain aneurysms depend on factors such as size, location, and overall health of the affected individual. 

For unruptured aneurysms, treatment options may include observation and monitoring or surgical intervention. Surgical interventions include endovascular coiling and surgical clipping, both of which aim to prevent rupture by sealing off the aneurysm. 

What are the treatment and recovery options for brain aneurysms

For ruptured aneurysms, immediate and emergency care is required. Recovery varies depending on the individual’s age, overall health, and the extent of the damage caused by the ruptured aneurysm. 

Rehabilitation may include physical, occupational, and speech therapies to help regain function and independence.