A brain aneurysm is a serious condition where a blood vessel in the brain weakens and bulges. It can remain unnoticed, but if it leaks or ruptures, it may cause life-threatening bleeding. It is often described as “a bulge or ballooning in a blood vessel in the brain.”

One of the most important warning signs is a sudden, intense headache, often called “the worst headache of my life.” This can appear without warning and may signal a leak or rupture. Recognizing this symptom early can be critical.

Other signs may develop alongside the headache. These include blurred or double vision, confusion, nausea, vomiting, neck stiffness, light sensitivity, seizures, and weakness or numbness on one side of the body. A drooping eyelid or a dilated pupil can also appear.

A smaller leak, known as a “sentinel bleed,” may happen before a full rupture. The headache may last for days, offering a brief window to seek help. Immediate medical attention is essential if symptoms appear together or worsen quickly.

Certain factors can increase risk, including age, high blood pressure, smoking, alcohol or drug use, and sometimes genetics or past injuries. While not all aneurysms can be prevented, awareness plays a major role.

The key message is simple: don’t ignore sudden or unusual symptoms. Acting quickly can save a life and prevent serious complications.