The kidney element in Chinese medicine governs water and is associated with the season of winter, where the energies are turning from the hotter yang months to the more yin of winter. Each organ has an element associated with it: liver and wood, stomach and earth, kidney and water, for example. There is also an emotion, a color and flavor associated with the organ system. For the kidneys, the emotion is fear, the color is dark or black and the flavor is salty. It also opens to the ear, has the direction of north and is paired with the bladder. The kidney element houses willpower and manifests in the teeth and luster of the hair.
The kidneys are the body’s root and contain both yin and yang energies. Yin is associated with what is dark, still, cold, feminine and is inward. Yang is more outward, hot, bright, moving and masculine. The kidneys control reproduction, growth and development and are associated with bones and marrow. The kidneys are said to store jing, which is likened to essence, what you’re born with and what’s inherited from your parents.