See "In the Sea". It refers to the world and the whole country. For example, Jia Yi's On Qin "has the meaning of sweeping the world, including the whole world." "Battle of Red Cliffs": "Then Jingzhou was broken, and it was a great shock to the world." "Epang Palace Fu": "Six kings finish, four seas-"Five-person tomb tablet: "How many people are there in the world?"

Se8S, the sea of marrow, blood, qi and water, is the place where subtle substances such as qi, blood and essence of human body gather. "Sea" is where rivers and water meet. According to the meridian theory, the qi and blood prevailing in the twelve meridians is like water flowing on the earth, such as rivers flowing to the sea. Therefore, "On Shu Hai" pointed out: "People have marrow orifices, blood sea, qi sea and water valley sea, and these four should be universal."

The part of the four seas is similar to that of Qijie. The marrow sea is located in the head, the qi sea is located in the chest, the water valley sea is located in the upper abdomen, and the blood sea is located in the lower abdomen, and all parts are interrelated.

The four seas govern the whole body's qi, blood, body fluid, in which the brain marrow sea is the mansion of the Yuan God, the source of arrogance, and governs the activities of viscera and meridians; The chest is the sea of qi, where the ancestors gather and breathe through the heart pulse; Stomach is the sea of water valley, the source of nourishing and defending qi, that is, the source of qi and blood biochemistry; Chong pulse is the sea of the twelve meridians, which begins in the uterus and goes up with Shaoyin Meridian. It is the root of the twelve meridians, the origin of triple energizer, and the motive force of human life activities, also known as "blood sea".

The theory of four seas further clarifies the composition and source of qi in meridians. Lesions in the four seas are mainly divided into two categories: excess and deficiency, which can be treated according to syndrome differentiation in clinic.

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