There are many diseases that cause pain in the neck like falling pillow, and the common ones are cervical spondylosis, frozen shoulder, lymphadenitis, and so on. 1. Cervical spondylosis: Cervical cervical spondylosis, nerve root cervical spondylosis, spinal cord cervical spondylosis and so on, all of them will be manifested as soreness and pain in the neck. 2. Frozen shoulder: Frozen shoulder not only causes shoulder pain, but also may involve the neck and produce neck pain. 3. Lymphadenitis: When the lymph nodes in the neck are inflamed, it will manifest as redness, swelling, heat and pain in the neck. There may be other causes of neck pain, such as cervical fibromyositis, neck sprains, etc. When prolonged neck pain occurs, it is recommended to consult a doctor in time, complete the relevant examinations, and carry out targeted treatment and therapy after clarifying the cause of the disease.