黄帝问于岐伯曰∶水谷入于口，输于肠胃，其液别为五。天寒衣薄，则为溺与气；天热衣浓，则为汗；
悲哀气并，则为泣；中热胃缓，则为唾∶邪气内逆，则气为之闭塞而不行，不行则为水胀。余知其然也，不
知其何由生？愿闻其道。岐伯曰∶水谷皆入于口，其味有五，各注其海，津液各走其道。故三焦出气，以
温肌肉，充皮肤，为其津；其流而不行者为液。天暑衣浓，则腠理开，故汗出。寒留于分肉之间，聚沫则
为痛。天寒则腠理闭，气湿不行，水下留于膀胱，则为溺与气。五脏六腑，心为之主，耳为之听，目为之
候，肺为之相，肝为之将，脾为之卫，肾为之主外。故五脏六腑之津液，尽上渗于目，心悲气并，则心系
急，心系急则肺举，肺举则液上溢。夫心系与肺，不能常举，乍上乍下，故咳而泣出矣。中热则胃中消谷，
消谷则虫上下作，肠胃充郭，故胃缓，胃缓则气逆，故唾出。五谷之津液，和合而为膏者，内渗入于骨空，
补益脑髓，而下流于阴股，阴阳不和，则使液溢而下流于阴，髓液皆减而下，下过度则虚，虚故腰背痛而胫
酸，阴阳气道不通，四海闭塞，三焦不泻，津液不化，水谷并行肠胃之中，别于回肠，留于下焦，不得渗膀
胱，则下焦胀，水溢则为水胀。此津液五别之逆顺也。
Huangdi asked Qibo: When food and drink enter the mouth, they are transported to the stomach and intestines. Their fluids differentiate into five types. In cold weather with thin clothing, they become urine and flatus; in hot weather with thick clothing, they become sweat; when sorrow causes Qi stagnation, they become tears; when internal heat relaxes the stomach, they become saliva. If pathogenic factors reverse internally, Qi becomes obstructed and fails to circulate; failure of circulation leads to water distension (edema). I know that this is how it happens, but I do not know by what mechanism it arises. I wish to hear the principle.
Qibo replied: Food and drink all enter through the mouth. Their flavors belong to the Five Flavors, each pouring into its respective "Sea" (a term for areas where Qi and Blood gather), and the Jingye (body fluids) each follow their own pathways. Thus, the Sanjiao (Triple Burner) emits Qi to warm the muscles and fill the skin; this is called Jin (thin fluid). That which flows slowly and does not easily disperse is called Ye (thick fluid). When the weather is hot and clothing is thick, the Couli (pores) open, so sweat is excreted. When cold remains between the Fenrou (muscle intervals), condensed foam forms pain. When the weather is cold, the Couli close, Qi and dampness do not circulate, water descends and stays in the Bladder, thus becoming urine and flatus.
Among the Zang and Fu organs, the Heart is the ruler, the Ear is the listener, the Eye is the observer, the Lung is the minister, the Liver is the general, the Spleen is the guard, and the Kidney is the manager of the exterior. Therefore, the Jingye of the Zang and Fu organs all seep upward into the eyes. When the Heart is sorrowful and Qi merges, the Xinxi (heart connection/tissue) becomes tense. When the Xinxi is tense, the Lung rises. When the Lung rises, fluids overflow upward. Since the Xinxi and Lung cannot remain constantly elevated, but rise and fall alternately, coughing and tearing occur. Internal heat causes the stomach to digest grain rapidly; rapid digestion causes worms in the intestines to move up and down, filling and expanding the stomach and intestines, thus causing gastric relaxation. Gastric relaxation leads to rebellious Qi, thus causing spitting of saliva.
The Jingye from the Five Grains harmonize and combine to form a paste-like substance. This penetrates inward into the bone cavities to nourish the brain marrow, and flows downward into the inner thighs. If Yin and Yang are not in harmony, fluids overflow and flow downward into the yin region. Marrow and fluids both decrease and descend; if descent is excessive, deficiency results. Deficiency causes lower back pain and shin soreness. If the Qi channels of Yin and Yang are blocked, the Four Seas are closed, the Sanjiao fails to drain, and Jingye fails to transform, water and grain travel together within the stomach and intestines. They are separated at the Hui Chang (returning intestine), stay in the Lower Jiao, and fail to渗 (seep) into the Bladder. This causes distension in the Lower Jiao; overflowing water leads to water distension (edema). This describes the normal and abnormal patterns of the five differentiations of Jingye.