There are many reasons for shoulder and neck pain, such as physiological factors, cervical spondylosis, soft tissue injury of shoulder and neck, coronary heart disease and so on. 1. Physiological factors: prolonged sitting and standing, playing cell phone with head down for a long time, or other bad postures may lead to aseptic inflammation of shoulder and neck muscles, thus causing shoulder and neck pain. 2. Cervical spondylosis: patients with cervical spondylosis may have cervical curvature changes, cervical osteophytes, herniated discs, etc., which may cause cervical spine pain, activity limitation, and may even involve the shoulder, resulting in shoulder and neck pain. 3. Shoulder and neck soft tissue injury: incorrect sleeping posture, inappropriate pillow, etc., may cause pillow fall, resulting in shoulder and neck pain. In addition, strains and sprains in the shoulder and neck muscles can also cause shoulder and neck pain. 4. Coronary heart disease: coronary heart disease patients with severe myocardial ischemia will not only cause pain in the anterior region of the heart, and in severe cases, it will also be radiated to the left side of the shoulder and neck, resulting in the phenomenon of shoulder and neck pain. There are many other causes of shoulder and neck pain, including shoulder and neck fasciitis and pleurisy, etc. In specific cases, it is recommended that patients go to the hospital to improve the examination in order to make a clear diagnosis, and should not ignore the symptoms and take them lightly, so as not to delay the treatment of the condition.