For most people, every day there are at least 1 / 4 to 1 / 3 of the time is spent in sleep, so if used improperly or without a total  pillows, easy to cause or aggravate cervical spondylosis. Conversely, if attention and adjustment of cervical posture during sleep, may have preventive and therapeutic effects.
As the saying goes, "sit back and relax" is not so. Under normal circumstances the physiological cervical lordosis-shaped curve, supine position, if the pillow is too low, head and neck over the back, so lordosis curvature increased, not only in front of the vertebral body due to muscle and ligament tension is too large and easy fatigue , and can cause chronic damage. At the same time, broke into the spinal canal behind the organization can move forward and increase pressure on the spinal canal; head and neck over backwards to make the spinal canal has been stretched, spinal cord and nerve roots become relatively short, easily under the effect of other factors in the onset of symptoms . If the pillow is too high, excessive neck flexion, so that the back muscles and ligaments of vertebral strain easily, cause or aggravate cervical spondylosis.
Thus, both the health of people, or people who have cervical disease, should pay attention to maintaining the physiological cervical lordosis posture, to prevent the cause or accelerate degeneration of the cervical spine. The first appearance in line with the ideal body pillow overall normal physiological curve, making sleep either supine, lateral, cervical position, to restore normal physiological curve of the respiratory tract.
In order to effectively maintain physiological cervical flexion degree, so that the neck muscles to fully relax, the pillow should be adjusted to the middle of the low, high end, neck edge slightly higher, on the edge of the low-class saddle, which is often said that the B-shaped pillow . Texture of the pillow should be reasonable and moderate, non-resilient, rectangular. Because each person's body in size, shoulder width with individual differences, height varies across the pillow, to ensure the maintenance of cervical spinal flexion degree. To this end, the pillow should be considered in making a scalability, but also help transform the pillow height, to adapt to a different sleeping position (Yang, side).