A brain aneurysm is a weak, ballooned area in the wall of an artery in the brain. Most never rupture, and many are never discovered, but the ones that do burst can cause a life-threatening bleed known as a subarachnoid hemorrhage. Knowing who is at higher risk, which warning signs to take seriously, and when screening makes sense can genuinely save lives.

How Aneurysms Form

Artery walls are made of layers of muscle and elastic tissue. Where blood vessels branch, the wall faces constant stress from blood flow. Over years, particularly with high blood pressure or smoking, a weak spot can stretch outward, much like a bulge on a worn tyre. The bulge is thinner than the normal wall and can leak or burst.

Most aneurysms are small, saccular ("berry-shaped"), and located at junctions of arteries at the base of the brain.

Who Is at Higher Risk?

Some risk factors cannot be changed:

  • Family history: having two or more close relatives with brain aneurysms or aneurysm rupture raises risk noticeably
  • Inherited conditions: including polycystic kidney disease and certain connective tissue disorders
  • Age: Aneurysms are more common in adults over 40
  • Sex: women are affected more often than men
  • Previous aneurysm: people who have had one are at risk of developing others
  • Certain vascular conditions: such as arteriovenous malformations

Others are modifiable:

  • High blood pressure, the most important controllable factor
  • Smoking, strongly linked to both formation and rupture
  • Heavy alcohol use
  • Stimulant drug use, such as cocaine
  • Uncontrolled high cholesterol

Symptoms

Unruptured aneurysm. Usually silent. Occasionally a large aneurysm presses on nearby structures, causing:

  • A drooping eyelid
  • Double vision
  • A dilated pupil
  • Pain above or behind the eye
  • Numbness or weakness on one side of the face

Warning headache. Some people experience a sudden, unusually severe headache days or weeks before a major rupture, caused by a small leak. This is sometimes called a sentinel headache and should never be ignored.

Rupture symptoms (emergency):

  • Sudden, explosive headache, often described as the worst of your life
  • Nausea and vomiting
  • Stiff neck
  • Blurred or double vision
  • Sensitivity to light
  • Seizure
  • Drowsiness, confusion, or loss of consciousness

Anyone with these symptoms needs emergency hospital care immediately. Every hour matters after a rupture.

Why Rupture Is So Dangerous

When an aneurysm bursts, blood spreads into the fluid space around the brain. Around one in three patients do not survive, and among survivors, many face lasting disability. Complications can include re-bleeding, vasospasm (narrowing of brain arteries), and fluid build-up in the brain. This is why identifying and treating high-risk aneurysms before rupture is so valuable.

Who Should Consider Screening?

Routine screening is not recommended for the general population, because most aneurysms are small and low-risk, and detection can cause anxiety without clear benefit. It may be appropriate if you have:

  • Two or more first-degree relatives (parents, siblings, children) with brain aneurysm or rupture
  • Polycystic kidney disease
  • A known connective tissue disorder
  • A personal history of an aneurysm
  • Certain other conditions, as advised by a specialist

Screening is done with MR angiography or CT angiography, both non-invasive. Digital subtraction angiography provides the most detailed view and is usually reserved for planning treatment.

Treatment Options

If an aneurysm is found, the decision depends on its size, shape, location, growth on follow-up, and your age and health. Options include:

  • Observation: small, low-risk aneurysms are often monitored with scans while risk factors are controlled
  • Endovascular coiling: soft platinum coils are placed inside the aneurysm to seal it off
  • Balloon-assisted or stent-assisted coiling: for aneurysms with wide necks
  • Flow diverters: mesh stent-like devices that redirect blood away from the aneurysm and allow the vessel wall to heal
  • Surgical clipping: a neurosurgeon places a small clip across the aneurysm neck through an opening in the skull

For suitable patients, Brain Aneurysm Coiling Treatment is performed through a catheter inserted into a blood vessel, allowing the aneurysm to be treated without opening the skull. 

Endovascular treatments are performed through a small puncture in the groin or wrist, without opening the skull, and are commonly followed by shorter hospital stays. The best approach is chosen jointly by neurointerventional and neurosurgical specialists.

Living With a Known Small Aneurysm

Being told you have an aneurysm can be frightening, but many small ones remain stable for years. Reasonable steps include:

  1. Keeping regular follow-up imaging as advised
  2. Controlling blood pressure with medication and low salt intake
  3. Stopping smoking completely
  4. Avoiding heavy straining and stimulant use
  5. Knowing the warning symptoms and having a plan to reach an emergency department quickly
  6. Informing family members if screening may be relevant for them

How to Lower Your Risk

  • Check blood pressure regularly and keep it within your doctor's target
  • Stop smoking, and ask for support if needed
  • Limit alcohol
  • Maintain a healthy weight and stay active
  • Eat a balanced diet, low in excess salt
  • Manage cholesterol and diabetes
  • Avoid recreational stimulant drugs

What Happens If an Aneurysm Ruptures

A ruptured aneurysm is treated as an emergency. The patient is stabilised, blood pressure is carefully controlled, and urgent angiography confirms the source of bleeding. The aneurysm is then secured, most often within 24 hours, by coiling or clipping to prevent re-bleeding. Afterwards, patients are watched closely in a neuro-intensive setting for complications such as vasospasm and hydrocephalus, and rehabilitation may be needed for weakness, speech, or memory difficulties.

Talking With Your Family

If you have been diagnosed with an aneurysm, let close relatives know, because their own risk may be higher. Ask your doctor whether they should consider screening, especially if more than one family member is affected.

Myths Worth Correcting

"Every aneurysm needs treatment." Many small, stable aneurysms are safely watched.

"Aneurysms only affect the elderly." They can occur at younger ages, especially with family history.

"Nothing can be done except open brain surgery." Most aneurysms today can be treated from within the blood vessels.

Expert Neurovascular Care

Dr. Sandeep Sharma and the team at IRFacilities assess each aneurysm carefully using detailed vascular imaging, and recommend monitoring or treatment based on real risk rather than fear. Whether you have a diagnosed aneurysm, a strong family history, or simply concerning symptoms, an informed opinion can bring clarity.

Have a family history or a diagnosed aneurysm? Book a consultation at IRFacilities.

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