《黄帝内经·灵枢·本神》
肾是藏精的器官；人的意志是依附于精气的，肾气虚就会四肢发冷，肾气太盛就会有胀满、五脏不安之状。
肾藏精，精舍志，肾气虚则厥；实则胀，五脏不安。
The kidneys are an organ that stores the 'essence' of the body, and the will of the person is dependent on the essence, which works to make the qi of the kidneys is weak, the limbs will become cold, and the qi of the kidneys is too strong, there will be a feeling of fullness and the five organs will not live in harmony.