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Horner's Syndrome Underlying Cause
Horner's syndrome is usually caused by irritation of nerves in the neck that supply the face.

Common causes include:
  • Inflammation of structures within the neck
    • Localized swelling causes pressure on a nerve
  • Lung cancer
    • The tumor is pressing on a nerve
  • Carotid artery aneurysm
    • Weak and swollen area of the carotid artery that is pressing on a nerve
  • Subclavian artery aneurysm
    • Weak and swollen area of the subclavian artery that is pressing on a nerve
  • Carotid artery dissection
  • Neck injury:
    • Injury to a nerve
  • Cluster headaches
  • Carotid artery occlusion
  • Syringomyelia
    • A disorder where a cyst forms within the spinal cord.
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Last Updated: May 20, 2008  References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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