Horner's syndrome is a rare neurological condition that results from damage to the sympathetic nerves supplying the eye and surrounding structures. It is characterized by a triad of symptoms: drooping of the eyelid (ptosis), constricted pupil (miosis), and absence of sweating on the affected side of the face (anhidrosis). These symptoms occur due to disruption in the nerve pathways that control these functions. The causes of Horner's syndrome can vary and may include trauma, tumors, or certain medical conditions affecting the neck or chest. Diagnosis typically involves a physical examination and imaging studies to identify the underlying cause. Treatment focuses on addressing the root issue, as there is no specific cure for the syndrome itself.