Horner's syndrome

Horner's syndrome is a condition caused by damage to a specific nerve pathway in the neck and face. This damage disrupts signals that control certain eye and facial functions. As a result, affected individuals may experience drooping eyelid (ptosis), a smaller pupil (miosis), decreased sweating on one side of the face (anhidrosis), and sometimes a sinking of the eyeball (enophthalmos). The symptoms occur on the same side as the nerve damage. Horner's syndrome often indicates an underlying issue such as a tumor, injury, or vascular problem affecting the nerve pathway.