Horner Syndrome

Horner syndrome is a group of signs that appear when a nerve pathway that regulates certain functions of the face and eye on one side is interrupted. It is not a disease in itself, but a sign that something is affecting that pathway.

How it presents: Typically, on just one side of the face, a slight droopy eyelid, a smaller pupil, and decreased sweating are observed.

Why it matters? Its significance lies in the fact that it may be an indication of various underlying conditions that are worth investigating.

Which specialist evaluates it? The neurologist, or the pediatrician when it occurs in children, is the one who studies the origin of these signs. If you notice a striking difference between the two eyes or a droopy eyelid, the advisable course is to seek an evaluation that clarifies the cause.