Traditional Chinese Medicine Kidney Yin Deficiency. It takes years from them to develop the only exception is the yin deficiency and empty heat that may form in an acute way during an invasion of wind heat with heat penetrating into the interior. Yin is substance to the body like a log is substance to a fire.

Yin is substance to the body like a log is substance to a fire. A qi deficiency is a diagnosis in traditional chinese medicine tcm defined as the loss of the vital life force believed to circulate throughout the body and form a part of every living entity. Causes of kidney yin deficiency loss of fluids.
Being either perspiration for example during a fever or through diarrhoea during the course of a disease or loss of blood.
Yin is substance to the body like a log is substance to a fire. Yang deficiency and traditional chinese medicine. When relating you can say that a log yin feeds a fire yang. Kidney yang deficiency and yin yang theory.