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All diseases take "deficiency, excess, cold, and heat" as the general principles. How could warm-heat diseases (diseases caused by warm-heat pathogens) be an exception? However, true deficiency, excess, cold, and heat are easy to differentiate, while those that appear similar but are different are difficult to identify. There are cases where excess syndromes resemble deficiency, deficiency syndromes resemble excess, heat syndromes resemble cold, and cold syndromes resemble heat; these must not fail to be carefully differentiated. Therefore, I specifically discuss them one by one in detail.

The so-called "excess syndrome resembling deficiency," taking exterior syndromes (pathogens located on the body surface) as an example: headache and fever indicate the pathogen is in the exterior. The pulse should be floating (superficial), and symptoms should include absence of sweating. Yet, spontaneous sweating occurs instead, the pulse is forceless, and after using diaphoretic (sweat-inducing) herbs, the body pain反而 worsens. This appears like a deficiency syndrome. Thus, some people, confused by excessive spontaneous sweating, mistakenly use Guizhi Tang (Cinnamon Twig Decoction); some, confused by the forceless pulse, cite Zhang Zhongjing's *Treatise on Cold Damage* (Shanghan Lun), Chapter on Taiyang Disease, stating "fever, aversion to cold, and weak pulse indicate lack of Yang," and mistakenly use Xiaojianzhong Tang (Minor Construct the Middle Decoction); some, confused by body pain, cite Zhang Zhongjing's saying "if not resolved, with body pain, one should warm the interior," and mistakenly use Sini Tang (Frigid Extremities Decoction). They do not know that when latent pathogens (pathogens lying dormant within the body) are in the exterior, spontaneous sweating is due to pathogenic heat steaming from the interior to the exterior, not exterior deficiency; the forceless pulse is because heat pathogens tend to scatter, making the pulse soft, unlike cold pathogens which tend to contract, causing a tight pulse; body pain occurs because latent pathogens gradually emerge from the interior to the exterior, unlike Yang deficiency which cannot tolerate diaphoresis. This is the case of exterior excess syndromes resembling deficiency.

Taking half-exterior half-interior (pathogen location between the exterior and interior) as an example: alternating chills and fever, and fullness in the chest and hypochondrium indicate the pathogen is in the half-exterior half-interior. The pulse should wiry, and there should be thirst. Yet, the pulse is deep, and there is no thirst, appearing like a cold syndrome. Thus, some people, confused by the deep pulse, consider chest and hypochondriac fullness as a Taiyin disease and no thirst as internal cold, mistakenly using Lizhong Tang (Regulate the Middle Decoction). They do not know that when latent pathogens are in the half-exterior half-interior, a deep pulse indicates the pathogen is lodged in the Membrane Source (a specific location between the interior and exterior) and has not yet emerged to the exterior, hence the pulse is not floating, not indicating Yang deficiency; no thirst indicates the pathogen has not transformed or transmitted into the Stomach Fu organ, hence it does not consume fluids to cause thirst, not indicating internal cold. This is the case of heat syndromes in the half-exterior half-interior resembling cold.

Taking interior syndromes (pathogens inside the Zang-Fu organs) as an example: dry mouth and throat, inability to lie down indicate the pathogen is in the interior. The pulse should be surging, the body hot, and stool constipated. Yet, the pulse is deep, fine, choppy, and weak; the body has cold extremities; and there is spontaneous diarrhea. This completely resembles a deficiency-cold syndrome. Some people, confused by the fine, choppy, and weak pulse, use Renshen (Ginseng Radix et Rhizoma); some, confused by cold extremities, use Rougui (Cortex Cinnamomi) and Fuzi (Radix Aconiti Lateralis Preparata); some, confused by spontaneous diarrhea, use Renshen, Baizhu (Atractylodis Macrocephalae Rhizoma), and Ganjiang (Zingiberis Rhizoma). They do not know that when latent pathogens are in the interior, a deep, fine, choppy, and weak pulse is due to pathogenic heat knotting in the intestines and stomach, preventing Qi from reaching Ying and Wei (nutritive and defensive levels); cold extremities occur because pathogenic heat knots in the interior and cannot reach the exterior, with Qi knotted below and unable to communicate above; spontaneous diarrhea is actually "diarrhea surrounding a fecal impaction" (heat knotting internally forcing fluid out). This is the case of interior excess syndromes resembling deficiency and heat syndromes resembling cold.

In summary, warm-heat diseases belong to latent fire, greatly differing from the cold causes of wind-cold diseases. Although pulses and symptoms may sometimes resemble deficiency and cold, once differentiated as warm-heat diseases, they belong to excess pathogens presenting false signs of deficiency and cold. Clear-sighted practitioners will not be misled.

The so-called "deficiency syndrome resembling excess," taking exterior syndromes as an example: headache, fever, body pain, spontaneous sweating, and a large floating pulse indicate the pathogen is in the exterior. If cooling and dispersing herbs are used repeatedly without symptom reduction, it is not due to lack of efficacy, but because Zhengqi (healthy Qi) cannot drive the medicinal power to the exterior, and Yin fluids cannot transform into sweat following Yang Qi. This is the case of exterior deficiency syndromes resembling excess when latent pathogens are present. For Qi deficiency, adding Renshen (Ginseng Radix et Rhizoma) to exterior-dispersing herbs induces sweating; for Yin deficiency, adding moistening herbs to exterior-dispersing herbs induces sweating. If one fails to recognize the dual deficiency of Qi and Blood and continues to disperse the exterior excessively, sudden collapse and syncope will inevitably occur.

Taking the half-exterior half-interior as an example: chest and hypochondriac fullness, deafness, vomiting, malaria-like symptoms, and a wiry pulse indicate the pathogen is in the half-exterior half-interior. If harmonizing and guiding-out herbs are used repeatedly with worsening symptoms, it is not due to ineffective medication, but because the Middle Jiao (Spleen and Stomach) is injured with stagnant Qi transport, and Liver Yin is injured with intensified Fire dryness. This is the case of half-exterior half-interior deficiency syndromes resembling excess when latent pathogens are present. One must combine Sijunzi Tang (Four Gentlemen Decoction: Renshen, Baizhu, Fuling (Poria), Gancao (Licorice Root), plus Shengjiang (Fresh Ginger) and Dazao (Jujube)), Liujunzi Tang (Six Gentlemen Decoction: Sijunzi Tang plus Chenpi (Tangerine Peel) and Banxia (Pinellia Tuber)) with harmonizing herbs, and Siwu Tang (Four Substance Decoction: Danggui (Angelica Sinensis Radix), Shengdi Huang (Rehmanniae Radix Preparata), Shaoyao (Paeoniae Radix), Chuanxiong (Ligustici Chuanxiong Rhizoma)) with clearing and resolving herbs, to achieve resolution through battle-sweat (shivering followed by sweating). If one continues to use guiding-out and clearing-resolving methods excessively, gastric Qi will perish, leading to death.

Taking interior syndromes as an example: yellow or black, cracked, dry tongue coating with prickles; hardness and pain in the chest, abdomen, hypochondrium, and umbilicus; obstruction of urination and defecation; and rapid, large pulses in all six positions indicate the pathogen is in the interior. If purgative and draining herbs are used repeatedly, either failing to produce evacuation or worsening symptoms after evacuation, it is because Zhengqi cannot transport waste in the intestines and stomach, and Blood cannot moisten the intestines and stomach; this is not due to insufficient potency of the drugs. This is the case of interior deficiency syndromes resembling excess when latent pathogens have transmitted inward. For Qi deficiency, assist Stomach Qi to aid transport; for Blood dryness, nourish Yin to facilitate lubrication. Only when Qi moves and fluids transform can there be free passage. If one ignores the depletion and indulges in aggressive purging, coma, flaccidity, and exhaustion will lead to death.

In summary, if medicine does not target the disease, it damages Zhengqi. Damage to the lower part causes Zhengqi to float upward and rebel; damage to the middle part causes Zhengqi to scatter outward. Although pulses and symptoms may sometimes resemble excess and heat, if one inquires into the treatment history and finds excessive treatment has occurred, it belongs to Yuanqi (Primordial Qi) being deprived from within. When Zhengqi is deprived, it becomes deficiency. Clear-sighted practitioners will not be misled.

For the same symptom, deficiency and excess differ; a slight error in medication determines life or death. What should be the handle for differentiation? I answer: Use the following five differentiation methods to clarify. Furthermore, by distinguishing between previously mis-treated and untreated cases, determine whether the latent pathogen is excess, deficiency, excess with deficiency admixed, or deficiency with excess admixed. Grasping both the general outline and detailed aspects ensures that ambiguous symptoms cannot confuse the practitioner. In my discussions under each item, I carefully differentiate deficiency and excess for every symptom. Here, I provide a general discussion first because scattered points in various sections might be overlooked; thus, I summarize the critical points at the beginning. As for "extreme cold resembling heat," this only occurs in various cold-damage syndromes and is absolutely absent in warm-heat diseases, so it is not discussed here.