What is yin deficiency and cold excess?

Excess of yin leads to cold: excess of yin refers to a pathological change in the process of disease, such as excess of yin, dysfunction or decline, excessive cold of yin and accumulation of pathological metabolites. Too much yin leads to cold, which is mostly caused by feeling cold and dampness, or overeating leads to cold, cold and dampness are blocked in the middle, and yang does not control yin, resulting in excessive yin cold. Generally speaking, the pathogenesis of yin excess is characterized by excess of yin and deficiency of yang. Yin is characterized by coldness, quietness and dampness, so the cold pathological changes and the images of dampness and quietness caused by excessive Yin are manifested as cold form, cold limbs, eating heat, pale mouth, white fur and delayed pulse. Therefore, it is said that "Yin is abundant in cold".