Place the soy pillow under the neck, not just under the back of the head. It can effectively massage the action of the neck muscles, relieve the spasm of the neck muscles, promote the blood circulation of the neck muscles and eliminate the pathogenic inflammatory factor prostaglandin. It effectively improves the pain of the neck muscles. Also for the head also has a good massage effect, can stimulate the head acupuncture points, insomnia and dizziness and the prevention of colds have a certain effect. But soybean pillow is not suitable for everyone, because soybeans are larger, to be larger than cassia seeds, you can also try cassia seeds to do the pillow.