Identifying the warning signs of a brain aneurysm can be difficult, but medical experts are working to raise awareness of this life-threatening condition. According to the Mayo Clinic, a brain aneurysm is a bulge or ballooning in a blood vessel in the brain, often resembling a berry hanging on a stem. When it leaks or ruptures, it can cause bleeding into the brain, known as a hemorrhagic stroke. Most ruptures occur in the space between the brain and its thin protective tissues, called a subarachnoid hemorrhage.

Doctors emphasize the importance of recognizing symptoms early. The most common warning sign is a sudden, severe headache — often described as “the worst headache of my life.” Other symptoms include blurred or double vision, confusion, one dilated pupil, drooping eyelid, fainting, nausea, vomiting, stiffness in the neck, sensitivity to light, seizures, and weakness or numbness on one side of the body.

The Brain Aneurysm Foundation warns that headaches are usually the first sign of a leak or rupture. Experiencing several of these symptoms at once requires immediate medical attention — call an ambulance or have someone drive you to the hospital, but never drive yourself.

When a brain aneurysm leaks, it is called a sentinel bleed. The headache often starts suddenly and may persist for days before a rupture occurs. Seeking emergency care at this stage can be lifesaving.

While the exact cause of brain aneurysms is still unknown, doctors say certain groups are at higher risk. Older adults and women are more likely to develop them.

Other risk factors include heavy smoking, excessive alcohol or drug use, and high blood pressure.

Brain aneurysms may also result from head injuries or infections affecting blood vessels.

In some cases, individuals are born with the condition, highlighting the need for awareness and early intervention.