There are many reasons for the pain in the right side of the neck, most commonly seen in the pillow, cervical disc herniation, neck sprain. 1. Falling pillow: caused by cold, bad sleeping position or pillow discomfort, etc., can be manifested as a tendon pulling pain on the right side of the neck in the morning, and the activity is obviously limited, and can not freely move the rotating neck. 2. Cervical disc herniation: due to the rupture of the cervical intervertebral disc fibrous ring, resulting in the nucleus pulposus protruding or prolapsing, compression of peripheral blood vessels and nerves, can also appear in the right side of the neck a tendon tugging pain, accompanied by dizziness, numbness of the upper limbs, and so on. 3. Neck sprain: improper exertion of the neck during the activity causes neck sprain, resulting in a tendon pulling pain on the side of the neck. The right side of the neck a tendon pulling pain may have other reasons, such as neck and shoulder muscle fasciitis, etc., it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, standardized treatment.