SYMPTOMS

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Recognizing the Signs of a Brain Aneurysm: What You Need to Know

A brain aneurysm, also known as a cerebral aneurysm, is a bulging or ballooning area in the wall of a brain artery. Many aneurysms go unnoticed and cause no symptoms. However, if an aneurysm leaks or ruptures, it can lead to a life-threatening hemorrhagic stroke, and recognizing the warning signs becomes absolutely critical.

For individuals new to this condition, it can feel overwhelming—but understanding the symptoms can help you act quickly in an emergency. Here are 10 key symptoms to be aware of, especially in the case of a ruptured aneurysm:

Top 10 Symptoms of a Brain Aneurysm

Sudden, Severe Headache

Often described as "the worst headache of my life," this pain is typically abrupt and intense. It may strike without warning and feel unlike any previous headache. 

Nausea and Vomiting

These symptoms often accompany the severe headache and are due to increased pressure within the skull. 

Stiff Neck

A tight, sore neck may result from irritation of the meninges—the protective coverings of the brain and spinal cord—especially when blood leaks into the space around the brain. 

Blurred or Double Vision

Changes in eyesight can occur when the aneurysm presses on nerves near the eyes. Vision might appear fuzzy or doubled, or you may see spots or shadows. 

Sensitivity to Light (Photophobia)

Bright light can become painful or intolerable, often in combination with headache and eye strain. 

Seizures

Although not always present, seizures can occur if the aneurysm irritates surrounding brain tissue. This may be especially alarming in someone without a history of epilepsy. 

Loss of Consciousness or Fainting

Some people may briefly pass out or lose awareness—this can happen at the moment of rupture or shortly afterward. 

Confusion or Trouble Thinking Clearly

An altered mental state—such as disorientation, trouble speaking, or difficulty understanding what’s happening—can be caused by swelling, pressure, or bleeding in the brain. 

Drooping Eyelid or Dilated Pupil

If an aneurysm presses on the cranial nerves that control eye movement, one eyelid may droop, or the pupil may look larger on one side. 

Sudden Weakness or Numbness, Especially on One Side

You might notice weakness or tingling in the face, arm, or leg—often just on one side of the body. This reflects damage or pressure affecting specific areas of the brain.

What to Do If You Notice These Symptoms

If you or someone around you experiences one or more of these symptoms—especially a sudden, intense headache with any neurological changes—call emergency services immediately. Time is absolutely critical when it comes to brain aneurysms, particularly if rupture is suspected.

Even if you're unsure whether it's an aneurysm, it's always better to seek urgent care and rule it out than to wait and risk serious complications.

A Word of Reassurance

Learning about brain aneurysms can be frightening, but knowledge is empowering. With early detection and rapid medical care, many people recover and go on to lead full, meaningful lives. If you or a loved one has recently been diagnosed with a brain aneurysm or you're navigating recovery, know that you’re not alone—there are supportive medical teams and resources ready to help.