Although many unruptured aneurysms do not cause symptoms, larger ones may press on nerves or brain tissue. Possible warning signs can include pain above or behind one eye, a dilated pupil, double vision, changes in vision, numbness on one side of the face, or seizures. Mayo Clinic lists these as possible symptoms when an unruptured aneurysm affects nearby structures.

These symptoms can also be caused by other conditions, so they do not automatically mean someone has an aneurysm. Still, sudden or unusual neurological symptoms should not be ignored, especially if they are new, intense, or worsening.

When Symptoms Become an Emergency

The most dangerous situation is a ruptured aneurysm. A sudden, severe headache is one of the most important warning signs. Some people describe it as the worst headache they have ever experienced. Other emergency symptoms may include nausea, vomiting, stiff neck, sensitivity to light, confusion, vision changes, seizure, weakness, or loss of consciousness. The American Stroke Association warns that a sudden intense headache may signal a ruptured aneurysm and requires immediate medical attention.

Stroke-like symptoms should also be treated urgently. The CDC advises calling emergency services right away for sudden numbness or weakness, confusion, trouble speaking, vision trouble, trouble walking, dizziness, loss of balance, or a sudden severe headache with no known cause.

Who May Be at Higher Risk?

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