Klippel-Feil Syndrome, also known as KFS, is a rare condition characterized by the fusion of two or more cervical vertebrae in the neck area. This can cause the neck to appear shorter and stiffer than usual. There are several synonyms for KFS, such as congenital cervical vertebral fusion, cervical vertebral fusion syndrome, cervical spine fusion, and synostosis syndrome. Although KFS is a congenital condition, symptoms can worsen over time. These can include chronic neck and back pain, headaches, and limited range of motion in the neck. Early diagnosis and treatment can help manage symptoms and improve quality of life for those living with KFS.