The pain on the right side of the neck may be caused by the following reasons: 1) local muscle and soft tissue injury after trauma to the neck, or even several bone injuries, which then induces pain. 2) It may be induced by strain injury, for example, prolonged postures in daily life, especially playing cell phones with the head down or looking at computers, resulting in fatigue and strain injury to the neck muscles, inducing pain on one side of the neck. 3) It may be caused by neck diseases, such as cervical spondylosis, cervical disc herniation, spinal cord cervical spondylosis. The pain may be caused by neck diseases, such as cervical spondylosis, cervical disc herniation, and spinal spondylosis. 4. It may also be caused by the stimulation of the neck muscles by wind and cold as well as the pain caused by falling pillow or infection.