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Definition
By Mayo Clinic staff
Horner syndrome is a rare disorder that occurs when the nerves that travel from your brain to your eyes and face are damaged.
Horner syndrome typically affects only one side of your face. Hallmark findings of Horner syndrome include a drooping eyelid, decreased eye pupil size and decreased sweating on the affected side of your face.
Horner syndrome isn't a disease itself. Rather, it's a sign of another medical problem — such as a stroke, tumor or spinal cord injury — that damages the nerves to your face. In some cases, however, no underlying cause can be found.
There's no specific treatment for Horner syndrome. Instead, treatment is directed at the underlying cause, when possible.
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