It has two explanations:
The first method is to eliminate the original evil wind in the body by regulating blood, such as enriching blood, promoting blood circulation and removing blood stasis;
The second explanation is that by treating blood, you can achieve sufficient qi and blood, strong body, internal wind can not be born, external wind can not invade, and wind will self-extinguish.
Extended data:
The basic concept of blood
Blood is a nutrient-rich red liquid substance circulating in veins, and it is one of the basic substances that constitute the human body and maintain human life activities.
Pulse is the pipeline for blood to run, and blood circulates throughout the body in the pulse, so it is also called "blood house". Pulse plays a role in restricting blood circulation, and blood runs all over the body along the pulse, reaching the internal organs and external limbs, and reciprocating repeatedly.
If, for some reason, blood runs slowly in the pulse, if it cannot stop accumulating, it will become blood stasis. If, due to trauma and other reasons, the blood does not run in the pulse and escapes from the pulse, it will form bleeding, which is called "menstrual blood". Blood separated from menstruation will become blood stasis if it cannot be discharged or dissipated in time. Menstruation and blood stasis make blood lose its normal physiological function.
Blood flows all over the body along the pulse, which plays the role of nourishing and moistening, providing nutrition for the physiological activities of viscera, meridians, body surface and orifices, and is the fundamental guarantee of human life activities. Insufficient blood supply to any part of the human body will affect its normal physiological activities, cause disorder of physiological functions and destruction of organizational structure, and severe ischemia will endanger life.
Shui Gu essence and kidney essence are the basis of blood metaplasia. They are transformed into blood through a series of gasification processes under the joint action of spleen and stomach, heart, lung and kidney. Blood runs in veins and circulates all over the body, thus ensuring its nutritional and physiological functions.
Baidu encyclopedia-blood