Usually, the ideal height for a pillow is around 10-13 centimeters, but the specific size should be determined based on each individual's physical characteristics, especially the physiological curvature of the cervical spine. Individuals with broad shoulders and a larger body can use slightly higher pillows, while smaller individuals can use slightly lower ones. Generally speaking, individuals with high blood pressure, heart disease, and asthma may need slightly higher pillows, while individuals with low blood pressure or anemia may need slightly lower ones. Sleep habits also influence the determination of pillow height. Individuals who sleep on their backs should use pillows that are compressed to the same height as their fists, while those who sleep on their sides should use pillows that are the same height as their shoulder width. The ideal pillow is one that maintains the normal physiological curvature of the neck whether sleeping on one's back or sides. The article should be positive, without negative content.