The stiffness of the tendons on both sides of the neck, common causes are as follows: First, neck muscle strain, long-term head-down work or sleep posture is poor, can cause neck muscle strain, stiffness, the patient can carry out their own massage therapy to alleviate the symptoms of muscle stiffness, with the left hand massage of the right side of the neck muscles, perpendicular to the direction of the muscle alignment for plucking, so that the muscle tension is lowered, each time for 10 minutes and then change to the opposite side, completed daily 2 -Second, cervical spondylosis, cervical spondylosis will cause changes in the normal physiological curvature of the cervical spine, neck muscle burden increases, can lead to neck muscle stiffness, tension, 1-2 times a day cervical traction, each time for 30 minutes, 15 days for a course of treatment, you can significantly relieve the neck stiffness, tension and other symptoms.