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Human beings are born by inheriting the Yin and Yang of Heaven and Earth. Heaven possesses Six Qi (Wind, Cold, Summer Heat, Dampness, Dryness, Fire), to which humans correspond through the Three Yin and Three Yang meridians; Earth possesses Five Elements (Wood, Fire, Earth, Metal, Water), to which humans correspond internally through the Zang-Fu organs. Thus, the body is formed comprising skin, flesh, sinews, bones, marrow, essence, blood, vessels, four limbs, nine orifices, hair, teeth, lips, and tongue. Externally, Qi and Blood circulate and flow into the meridians, making them susceptible to injury by the Six Excesses (Liuyin, pathogenic factors of Wind, Cold, Summer Heat, Dampness, Dryness, and Fire); internally, the Spirit, Soul, Ethereal Soul, Corporeal Soul, Will, and Intent are susceptible to injury by the Seven Emotions (Joy, Anger, Worry, Pensiveness, Sorrow, Fear, Fright). The Six Excesses refer to Cold, Summer Heat, Dryness, Dampness, Wind, and Heat; the Seven Emotions refer to Joy, Anger, Worry, Pensiveness, Sorrow, Fear, and Fright. If one protects oneself appropriately, one remains peaceful and tranquil; if one acts against reason, myriad diseases arise. Once a disease pattern is diagnosed, one must trace its origin; thus, ancient sages taught that this is called the "Source of Disease." Does not the *Classic* say: "The ultimate treatment lies in identifying the two causes"; close the doors and windows, focus on the patient, ask repeatedly about their condition to follow their intent. This is intended to know the root cause of illness. However, the Six Excesses are the normal atmospheric changes of Heaven; violating them allows pathogens to first enter via the meridians and then combine internally with the Zang-Fu organs, constituting the External Cause; the Seven Emotions are the normal nature of humans; stirring them causes internal stagnation within the Zang-Fu organs first, manifesting externally on the limbs, constituting the Internal Cause; as for dietary irregularities (hunger and fullness), shouting damaging Qi, exhausting mental capacity, extreme physical fatigue, reversal of Yin and Yang, as well as injuries from tigers, wolves, poisonous insects, metal wounds, fractures, Zhuyu (a type of infectious or spiritual affliction), attachment of evil spirits, fear, compression, drowning, etc., which go against common sense, constitute the Neither-Internal-Nor-External Cause. The *Jin Gui Yao Lue* states: "A thousand kinds of difficulties do not exceed three categories." Analyzing this thoroughly, the sources of all diseases are exhausted. To seek cure, one must categorize them, distinguish the three causes, whether they involve both internal and external factors or an intermingling of excesses and emotions; deduce the depth of the pathology, determine the cause as the source of disease, then match various symptoms and treat according to the cause. Medicines, Bian stones, acupuncture, and moxibustion can all be applied without exception.

The so-called Six Excesses are Cold, Summer Heat, Dryness, Dampness, Wind, and Heat. Since Summer Heat and Heat belong to one Qi, and Dryness and Dampness share the same source, the *Shang Jing* consolidates them into four. These are: Winter injury by Cold leads to Spring Warmth disease; Spring injury by Wind leads to Summer Sundown diarrhea (inspissated stool/diarrhea with undigested food); Summer injury by Summer Heat leads to Autumn Malaria; Autumn injury by Dampness leads to Winter Cough. This follows the sequence of the four seasons. If violated, these four Qi can intertwine to cause illness. For instance, Warmth disease involves aversion to cold and fever; it is not restricted solely to Cold damage. Exposure to Wind, Summer Heat, or Dampness also presents such symptoms. However, Wind disperses Qi, hence sweating occurs; Summer Heat consumes Qi, hence fatigue ensues; Dampness overflows into the blood vessels, hence heaviness and stiffness occur. Although various trauma syndromes differ, their meridian transmission is identical, which must be known. Sundown diarrhea is similar. The *Classic* says: "Severe Cold leads to intestinal dysentery." Furthermore, prolonged Heat and Dampness lodging in the intestines and stomach causes slippery downward discharge, which is not limited to Wind injury; Malaria syndromes are also caused by the mutual entanglement of Cold, Summer Heat, Wind, and Dampness, initially not biased towards Summer Heat alone. The Treatise on Cough states that slight Cold causes cough; Heat in the Upper Jiao causing cough results in Lung萎 (Lung Atrophy); blowing of severe Wind causes hoarseness and cough. Is this solely restricted to Dampness? From this, we know that the Four Qi originate from the Six Transformations, and the Six Transformations originate from One Qi. Through movement and transformation, they divide into Yin and Yang; reversing this process creates the Six Excesses. Thus, the *Classic* says: "Yin serves as the master, Yang provides the rectitude." Violating them causes disease, disrupting the normal generation and transformation. When normalcy is lost, the four directions of Heaven and Earth become blocked. Treatment must seek the root, deducing based on the interwoven meridians. The so-called Wind-Cold, Wind-Warmth, Wind-Dampness, Cold-Dampness, and Damp-Warmth are five combined patterns; Wind-Damp-Cold and Wind-Damp-Warmth are two combined patterns; adding the previous four single patterns makes eleven variations. If injured, one should deduce accordingly. Additionally, the Three Yang meridians also have combinations. By distinguishing the affected and affecting factors, carefully differentiating pulse and symptoms without error, one can discuss treatment. Without thorough understanding of the subtleties of Excess transformations, pathogenic and righteous Qi, who could participate in this discussion?