The discomfort of a tendon on the right side of the neck may be caused by physiological reasons such as muscle spasm, or it may be caused by pathological reasons such as fasciitis and cervical spondylosis. 1. Muscle spasm: also known as pillow fall, commonly caused by incorrect sleep posture at night neck muscle tension, spasm, the patient can appear in the right side of the neck a tendon pain uncomfortable feeling. 2. Fasciitis: long-term work pulling damage to the neck muscles and ligaments, resulting in localized aseptic inflammation, can appear on the right side of the neck a tendon uncomfortable feeling. 3. Cervical spondylosis: due to cervical spine degeneration, hyperplasia compression of the right side of the nerve root, can cause neck pain, stiffness, radiating pain feeling. A tendon on the right side of the neck discomfort may also have other reasons, you should go to the hospital in time, clear reasons to give targeted treatment.