A brain aneurysm is a bulge or weak spot in a blood vessel in the brain.
On its own, it’s actually quite common and often harmless, since many aneurysms never cause symptoms or rupture.
However, if one leaks or bursts, it can lead to bleeding in the brain — known as a hemorrhagic stroke — which is a life-threatening emergency.
Is called a “sentinel bleed”
One of the most important warning signs is a sudden, severe headache. According to the Brain Aneurysm Foundation, other common symptoms can include nausea, a stiff neck, blurred vision, and sensitivity to light.
Not everyone experiences all of these signs, but if they appear suddenly, it’s critical to call emergency services rather than trying to get to the hospital on your own. Fast medical response can save a life.
In some cases, an aneurysm may begin leaking small amounts of blood before a full rupture. This is called a “sentinel bleed.” It often causes a sudden, intense headache that can last for days or even weeks. This is an early warning sign and should never be ignored — immediate medical care is essential.
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