U-shaped pillow is a kind of cervical pillow, often used in long-distance travel. u-shaped pillow the correct way to use is to put it on the cervical spine horizontal position, so that the cervical spine in a relatively neutral upright posture, especially when sitting for a long time in the train, airplane or other transportation, because the weight of the human head is relatively large, simply leaning on the back of the seat or seat, the cervical spine will bear relatively Large pressure, too much time too often to make the cervical spine excessive pressure, resulting in local soft tissue cervical fatigue, may cause cervical spine disease. If you keep sitting for a long time, the U-shaped pillow like a necklace hanging in the back of the neck, the back side of the U-shaped pillow and the left and right sides to play a role in lifting the head, so as to reduce the pressure on the cervical spine, especially after people fall asleep, the U-shaped pillow can limit the cervical spine around the side bending, to prevent cervical spine disease.