Signs and symptoms of Horner syndrome usually occur on one side of your face and typically include:

  • Drooping of your upper eyelid (ptosis) and slight elevation of the lower lid
  • Decreased pupil size in your affected eye (miosis)
  • Decreased or absent sweating on the affected side of your face (anhidrosis)

Rarely, a baby may be born with Horner syndrome. In these cases, the iris in the affected eye may be lighter in color than the other eye.

When to see a doctor

If you notice any signs or symptoms associated with Horner syndrome, see your doctor.

Apr. 16, 2011