The intertransformation of Yin into Yang and vice versa means that, under certain conditions, the two opposite parts within a phenomenon or thing can transform into their opposite, demonstrating the constant change of everything that exists.
Change is natural and necessary. Although Yin and Yang are opposites, they depend on each other to exist, creating a "dance" in search of constant balance, one growing and the other decreasing until the necessary conditions for their transformation are found. The maturity of conditions for change to occur is vital. Day and night are the clearest example: dawn never comes without the necessary conditions for it to happen.
From maximum Yin (night), Yang (day) is born, and from maximum Yang, Yin is born.
These changes occur largely due to internal causes, and only sometimes due to external causes. This means that change comes from within, it is natural, and sometimes it can be provoked from outside, causing that phenomenon or thing to undergo a radical change. If the relationship of mutual consumption between Yin and Yang is a quantitative change, intertransformation is of a qualitative nature. When the maximum of Yang is reached, naturally Yin is born in the depths of Yang, day transforms into night. When midnight is reached, within its depths the seed of day is born so that Yang rises again to its zenith.
The internal quality of that which transforms is another basic condition for Yin to become Yang and vice versa. Water, which is Yin, can evaporate and transform into vapor (Yang), but it cannot transform into Earth or any other element with an internal quality different from that of water.
Intertransformation as a law or process between Yin and Yang is very important. Knowing the state of things or their internal qualities and knowing they are in constant motion and in search of relative balance, leads us to think that that which we observe will naturally seek transformation when the conditions, internal or external, are favorable for change. This is the principle of prevention, anticipating transformation. That is: in an invasion of wind-cold attacking the lungs, symptoms such as clear nasal discharge, slow and superficial pulse, will transform into heat, with yellow and thick discharge, rapid and deep pulse, unless we treat the patient in time.
Exhausting and high-performance exercises are extremely Yang, which leads to depletion of internal Yin energies. While during exercise the pulse accelerates extremely (Yang), the quality of the resting pulse becomes increasingly slow (Yin). Excessive worry (Yang) exhausts the body (Yin).
Prevention in Acupuncture is based on the laws of Yin and Yang. Understanding them correctly and seeking balance in our lifestyle, our emotions, dietary flavors, sexual activity, exercise... This brings us not only to a correct clinical practice, but also to finding in first person the union of internal opposites and living the Tao as the main axis of medical ethics.
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