If a brain aneurysm is small, unruptured, and not leaking, symptoms are often unnoticeable. Small aneurysms are most likely to be asymptomatic, while larger ones can press against the brain and nerve tissues of the eye, leading to pain behind and above the eye, a dilated pupil, blurred or double vision, or a visibly drooping eyelid. The pressure can also cause weakness or paralysis on one side of the face.

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