Essence has several roles depending on our ages. From our birth it is responsible for the growth of bones, teeth, hair and brain. During teenage it is controls the puberty process. In adults, it controls reproductive function, fertility, conception and pregnancy.
As Essence declines with age, there is a natural decline of sexuality, fertility, hair growth and coloring, skin smoothness and so forth.
Improper bone formation, retarded growth (mental or physical), delayed puberty, premature aging, sterility or impotence are all symptoms of Essence Deficiency.
The term ‘Essence’ occurs in Chinese Medicine in three different contexts with slightly different meanings: Pre-Heaven Essence, Post-Heaven Essence and Kidney Essence.
Pre-Heaven Essence is basically the Essence one receives from their parents, a concept relatively similar to what modern science calls DNA. It is the only kind of Essence present in the fœtus and it is what determines each person’s basic constitutional make-up, strength and vitality. It is what makes each individual unique.
It determines our unique growth patterns and reproductive capacity. It represents the our constitutional potential for strength, vitality and resistance. Because it is inherited from the parents, it is considered fixed in quantity and quality, although it can be affected and supplemented through Post-Heaven Essence; a bit like one could compensate for their unfortunate DNA inherited from their parents with a particularly healthy lifestyle for instance. It is also said that it can be renewed to some extent by regular and prolonged periods of focused breathing exercises as well as exercises such as "Tai Ji Quan" or "Qi Gong".
Pre-Heaven Essence is stored in the Kidneys (see below).
Post-Heaven Essence represents what happens to us after birth. It is made up from what we derive from the air we breath as well as the food and drinks we take. Post-Heaven Essence is closely related to the Stomach and Spleen since they are responsible for the digestion of food and the transformation and transportation of Essence.
The Post-Heaven Essence is not a specific type of Essence, but simply a general term to indicate the Essences produced by the Stomach and Spleen after birth, as opposed to the Pre-Heaven Essence which is formed before birth. For this reason, the Stomach and Spleen are also known as the ‘Root of the Post-Heaven Essence’ and the Kidneys as the ‘Root of the Pre-Heaven Essence’.
Post-Heaven Essence can be replenished daily and can also supplement an eventual lack of Pre-Heaven Essence. Therefore in order to not dissipate our reserves of Pre-Heaven Essence or make up for a lack of it, it is wise for us to eat and drink pure, wholesome food and drinks and attend to our basic physical and psychological requirements, including proper sleep, exercise and recreation. Herbs can also compensate for a lack of Pre-Heaven Essence by replenishing Post-Heaven Essence.
Kidneys Essence is made up from both Pre-Heaven Essence and Post-Heaven Essence. When there are excessive amounts of Post-Heaven Essence circulating in the body, it is stored in the Kidneys for future use. If our body's Post-Heaven Essence is insufficient, previously stored Essence in the Kidneys will be used. If this process continues, the body starts using our 'stock' of inherited Pre-Heaven Essence and this might cause Essence exhaustion.
Kidney Essence determines growth, reproduction, development, sexual maturation, conception, pregnancy, menopause and ageing. This Essence is stored in the Kidneys, but it circulates all over the body, particularly in the so-called 'Eight Extraordinary Vessels'.
Essence is often assimilated as Qi when both concepts have few key differences:
According to Chinese Medicine, men’s Essence flows in 8-year cycles, and women’s Essence in 7-year cycles.
The flow of Essence in women goes as follows:
The flow of Essence in men goes as follows:
Essence is the substance behind our growth, our ability to reproduce and our ageing process.
In children, Essence controls the growth of bones, teeth, hair, brain development and sexual maturation. After puberty, it controls the reproductive function and fertility. Afterwards the decline of Essence leads to the decline of sexual energy and fertility. Ageing itself is explained by the decline of Essence in our bodies.
A good metaphor is to view the Kidneys as a large pot full of water. The fire under the pot is Kidney Yang and the Gate of Life, the water in the pot corresponds to Kidney Essence, and the resulting steam corresponds to Kidney Qi.
Therefore, Kidney Essence is a basic ingredient for the production of Kidney Qi thanks to the warming action of Kidney Yang.
The concept of Marrow in Chinese Medicine has no equivalent in Western Medicine. The bone marrow, brain and spinal cord are all made of Chinese Medicine's Marrow.
Since Essence produces Marrow, if Kidney Essence is weak, the brain, bone marrow and spinal cord may lack nourishment. Physical symptoms of a Kidney Essence Deficiency may therefore include a lack concentration and memory as well as dizziness and a feeling of emptiness of the head.
Essence is the basis for our resistance to external pathogenic factors. Although the Defensive Qi is mostly responsible for protection from external pathogenic factors, it has its root in the Kidney Essence. A Deficiency of Essence may therefore result in one being constantly prone to colds, influenza and other exterior diseases.
According to Chinese Medicine, Essence, Qi and Mind (Jing, Qi, Shen) are the three fundamental substances of a human being. For this reason, they are called the ‘Three Treasures’. A bit like water has three states (frozen, liquid and gas) Essence, Qi and Mind represent three different states of condensation of Qi: Essence being the densest, Qi being more rarefied and the Mind being the most immaterial.
Essence and Qi are considered to be the foundations of the Mind (Shen). If Essence and Qi are healthy and flourishing, the Mind will be healthy and fulfilled. On the other hand, if Essence and Qi are both depleted, then the Mind will suffer eventually.
A healthy Mind therefore depends on the strength of the Essence, which is stored in the Kidneys, and Qi, which is produced by the Stomach and Spleen. The trinity of Essence, Qi and Mind is often expressed in Chinese Medicine as Heaven (the Mind), Person (Qi) and Earth (Essence), corresponding to the Organs Heart, Stomach/Spleen and Kidneys, respectively.