SAFETY WARNINGS: Please consult a doctor to determine the cause of your neck pain. Ask your doctor if a cervical spine extension machine is suitable for treatment. • If the pain gets stronger while usage or if you feel worse, we suggest that you stop the application and consult a doctor. • Do not use when your airway or gullet is damaged. • Do not use when you have pain in your jaw or temporomandibular joint. • Do not use with structural problems with the stability of your spine caused by degenerative damage, fractions, infections, tumors or arthritis. • Consult a doctor before using the unit while pregnancy, high blood pressure or other cardiovascular diseases.