1, the pillow is too high. The human spine has a certain degree of curvature. The place where the neck bends is called "neck bend". A good pillow should completely conform to the curve of human neck. If the pillow is too high, people will be in a posture of bowing their heads, which will do great harm to the cervical spine.

2, the pillow is too low, the pillow will make people passively look up. In the long run, it will do great harm to the cervical spine, and it will also affect the respiratory system, and there will be problems such as mouth breathing and snoring.

It will be very comfortable to put a pillow on the head of the pillow, but it will be very tired to hang our neck for a long time. If we only use pillows when sleeping, it will make the cervical spine lose support.

4. Methods When lying flat with a pillow correctly, the place where the pillow supports the head is about a fist high (5 ~ 7 cm), and the part that supports the neck is about 3 ~ 5 cm higher. When lying on your side, make sure that the pillow can fill the gap between your ears and shoulders well and keep your spine in a straight line.