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Published on: 8/18/2026

Could a drooping eyelid be a sign of an aneurysm?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

A drooping eyelid (ptosis) can be a warning sign of an aneurysm, especially when it involves the third cranial nerve (oculomotor nerve), which controls eye movement and eyelid position. When an aneurysm—most commonly a posterior communicating artery aneurysm—presses on this nerve, it can cause sudden eyelid drooping, often accompanied by a dilated pupil, double vision, or eye pain.

This combination of symptoms is considered a medical emergency, as an unruptured aneurysm compressing a nerve may be at risk of rupturing, which can lead to life-threatening bleeding in the brain.

Because eyelid drooping can also stem from many less serious causes—like aging, muscle fatigue, or Bell's palsy—it's important to identify your specific symptom pattern quickly. Taking a free, instant, online symptom check can help you understand what may be causing your symptoms and guide you toward the right next steps, whether that's urgent care, a specialist visit, or reassurance. Given how quickly aneurysm-related symptoms can escalate, gaining clarity within minutes could make a critical difference.

Reviewed for medical accuracy: 07/14/2026

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Explanation

A drooping eyelid, known as ptosis, can be a sign of an aneurysm, especially if it involves the nerves that help move the eye.

Key Points:

  1. Oculomotor Palsy: According to Reference 1, aneurysms can cause oculomotor palsy, which affects the movement of the eye and can lead to a drooping eyelid.
  2. Cavernous Internal Carotid Artery Aneurysm: Reference 2 discusses how aneurysms in this area can present with symptoms like a drooping eyelid.
  3. Posterior Communicating Artery Aneurysm: Reference 3 highlights that this type of aneurysm can also cause similar symptoms.

If you notice a drooping eyelid along with other symptoms like double vision or severe headache, it is important to seek medical attention promptly. You can start by using a free symptom checker to better understand your symptoms and determine the appropriate next steps for care.

(References)

  • Enokida M, Sakurai Y, Sato T, Oka N, Okada H, & Suzuki J. (1978). [Oculomotor palsy caused by aneurysms at the internal .... No to shinkei = Brain and nerve, 687464.

  • Almaghrabi N, Fatani Y, & Saab A. (2021). Cavernous internal carotid artery aneurysm presenting with .... Radiology case reports, 33897925.

  • Danko C, & Williams D. (2021). A Case Report of Posterior Communicating Artery .... Journal of education & teaching in emergency medicine, 37465547.

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