The main manifestation of the pillow is that the patient suddenly feels pain in the back of the neck and upper back after waking up in the morning, with one side being the most common, and there may also be pain felt on both sides, the pain can radiate to the back of the shoulder, and sometimes feel aggravated when turning the head. The exact location of the pain lies in the tenderness of the muscles in the neck, especially the superficial muscles may appear stiff and spastic, and striated or block-like changes can be palpated, the symptoms are most obvious in the sternocleidomastoid and trapezius muscles. There will be pressure points at the mastoid process and the internal superior scapulae and infragonal fossa. It is usually caused by incorrect sleep posture or wind chill, and is generally self-limiting. After moderate rest and massage or hot compresses, the symptoms will be relieved in a week or so.