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Liu Baozhi's Commentary: The *Classic of Internal Medicine* (*Huangdi Neijing*) states, "Regarding all diseases that transform from cold damage into warm diseases, those occurring before the Summer Solstice are called 'Wen Bing' (Warm Disease), and those occurring after the Summer Solstice are called 'Shu Bing' (Summerheat Disease). Based on this, both the warmth of spring and the summerheat of summer are diseases caused by the eruption of latent pathogens (Fu Qi, pathogenic factors lying dormant in the body). However, in spring, there is additionally a wind-warmth pathogen; when contracted suddenly, it causes disease. This differs in essence, though not in name, from diseases caused by latent pathogens. In summer, there is also a summerheat-hot pathogen; when contracted suddenly, it causes disease, which also differs from diseases caused by latent pathogens. Zhang Zhongjing feared confusion with the summerheat of latent qi described in the *Neijing*, so in the *Treatise on Cold Damage* (*Shanghan Lun*), he named it 'Zhong Ye' (Heatstroke/Summerheat Stroke). Wang Shuhe, in the *Example of Cold Damage* (*Shanghan Li*), based his differentiation on the *Classic of Difficult Issues* (*Nan Jing*) stating that 'cold damage has five types,' claiming that latent cold from winter transforms into warm disease in spring and into hot disease in summer. Later medical texts thus named diseases caused by latent qi as 'Hot Disease' (Re Bing); while those caused by sudden contraction remained named 'Summerheat Disease' (Shu Bing). Because the name 'Summerheat Disease' was confused with the 'Hot Disease' of latent pathogens, and implicated Zhang Zhongjing's 'Zhong Ye' disease. Later scholars claimed that 'Ye' is a yang pathogen, referring specifically to heat; whereas 'Shu' is a yin pathogen, involving both dampness and heat. Little do they know that as cold departs and summerheat arrives, summerheat and cold are opposites. What the ancients called 'Shu', 'Ye', or 'Re' all belong to diseases caused by fire-qi, without involving dampness. If a disease involves both dampness and heat, the *Nan Jing* calls it 'Damp-Warmth' (Shi Wen), not 'Summerheat'. If one claims summerheat must involve dampness, then in years of severe drought in summer, when summerheat is predominant, dampness is not necessarily present. Moreover, conditions where dampness can be combined are numerous; indeed, because dampness has no fixed location and prospers through the four seasons, wind-damp, cold-damp, etc., can all be combined; only in summer does earth-qi prevail alone, so heat-damp is more common than cold-damp. However, the character 'Shu' contains 'Sun' (Day), representing heavenly qi; the character 'Shi' (Damp) contains 'Earth', representing earthly qi; heaven and earth are different. Although they can combine to cause disease, one cannot say that dampness originally exists within summerheat. I truly fear that these habitual errors will easily cause confusion. Therefore, I have detailed annotations for the sections in Zhang Zhongjing's book regarding latent qi erupting into warm and heat diseases at the front; and separately attached annotations for the sections on sudden summerheat-hot contraction and damp-warmth at the back; and labeled them distinctly as: 'Sudden Summerheat-Hot, Combined with Damp-Warmth.' Hopefully, this will clarify the structure, preventing readers from becoming confused.

When the Taiyang channel is affected by summerheat, it is called Zhong Ye. Symptoms include sweating, aversion to cold, fever, and thirst. It is treated with Baihu Tang plus Renshen (Ginseng Decoction).

Zhou Yuzai said: In winter, cold injures the body, hence called 'Zhong Han' (Cold Strike); in summer, heat injures the body, hence called 'Zhong Re' (Heat Strike). This is external heat, hence the term 'Zhong' (Strike), differing from the 'heat' of latent cold erupting into hot disease. Both use Baihu Tang because the injury is in the Qi level, which corresponds to Metal (Lung). The disease is heat; when Metal is diseased, mother and child organs are both affected. Thus, it is no different from latent qi originating in Shaoyin, erupting, and transmitting to Yangming; both are primarily treated with the same decoction. It is not divided into two meanings due to winter latent qi versus summer strike, nor are the thirsts slightly different between latent qi cases and current cases. In the formula Baihu Tang plus Renshen, Shigao (Gypsum) specializes in clearing the Lung and reducing fire in Metal, serving as the Sovereign herb; Zhimu (Anemarrhena Rhizome) also clears fire in the Lung and nourishes the source of Water; Renshen generates fluids and benefits the injured Qi, serving as the Minister herbs; Gancao (Licorice Root) and Jingmi (Rice) tonify Earth to generate Metal, serving as the Assistant herbs.

Xu Huixi said: Any disease with profuse sweating invariably involves aversion to cold. If, due to aversion to cold and sweating, it is mistaken for a cold pattern and hot agents are wrongly administered, the patient will immediately face danger.

In cold damage, if the pulse is floating and slippery, indicating exterior heat and interior cold, Baihu Tang is indicated.

Fang Xingzhong said: The transmitted text reads 'exterior heat and interior cold,' which must be a transcription error. Baihu Tang is originally for treating hot and summerheat diseases; its nature is greatly cold. How could someone with interior cold take it? Examining the text, the pulse is floating and slippery, not tight but slippery, indicating severe stagnation of yang qi, meaning there is interior heat. Severe interior heat repels cold to the exterior, causing limb厥逆 (reversal cold) and cool body, presenting as extreme pathological manifestations, appearing as exterior cold. Observing the Jueyin chapter: 'Pulse slippery with厥逆 indicates interior heat.' Thus, it is evident that the characters 'exterior' and 'interior' here are erroneous and should be swapped.

Liu Baozhi's commentary: The logic of this passage is untenable. Some interpret 'cold' in the Three Yang channels as 'pathogen'; Wei Nianting interprets 'interior' as the interior of meridians; Shen Yaofeng considers 'cold' a typo for 'Ye'; Wang Mengyin cites Xu Yazhi, suggesting 'cold' should be interpreted as 'phlegm'. All previous scholars offer forced explanations; only Fang's theory, swapping 'exterior' and 'interior', is closer to the correct meaning.

In cold damage, if the pulse is slippery with limb厥逆, it indicates interior heat, treated with Baihu Tang.

Zhang Luyu said: Slippery pulse is a yang pulse, so the厥逆 is yang厥逆. Interior heat is stagnant and blazing, so externally there is aversion to cold and limb reversal. Often, lips, face, and nails turn blue. Thus, Baihu Tang is suitable to clear interior heat.

If cold damage presents with no high fever, dry mouth/thirst, irritability, and slight aversion to cold on the back, Baihu Tang plus Renshen is indicated.

Zhang Jianshan said: Baihu Tang is a heavy agent for treating severe irritability, thirst, and dry heat. It should not be used early if exterior syndrome persists. The slight aversion to cold on the back mentioned here, and the frequent aversion to wind in the next section, are both exterior signs; however, because the irritability and heat are extremely severe, only Baihu Tang can resolve them, hence its use.

Shen Yaofeng said: Aversion to cold on the back is a yang deficiency pattern, but here it refers to the yin-yang of Ying and Wei Qi and Blood, not the water-fire of Kidney and Mingmen. This case features dry thirst and irritability, with intense Ye-heat inside, constituting a Baihu Tang pattern; only because Ye-heat consumes Stomach Qi, causing slight aversion to cold on the back, is Renshen added to tonify Wei Qi. In contrast, in Shaoyin disease, if the mouth is normal/pale and there is aversion to cold on the back, both Wei Yang and Kidney Yang are deficient, so Renshen and Fuzi (Aconite Root) are used together to tonify both.

Wu Hegao said: Slight aversion to cold on the back means the aversion is not severe; since dry thirst is present, the use of Baihu Tang plus Renshen is unquestionable. If there is aversion to cold without dry thirst, it cannot be used. Note: Comparing with the next section, sweat must be present for this formula to be applicable.

In cold damage, if the pulse is floating, with fever and no sweating, and the exterior is unresolved, Baihu Tang must not be given. If there is thirst for water and no exterior syndrome, Baihu Tang plus Renshen is indicated.

Shen Yaofeng said: This follows the previous section, stating that while irritability, thirst, and back aversion to cold warrant Baihu Tang plus Renshen, there are cases where, besides Ye-heat, wind-cold is also contracted, leading to aversion to cold, fever, and floating pulse. One must distinguish whether the exterior syndrome is resolved based on the presence or absence of sweat to determine if this formula is applicable.

In cold damage, if after vomiting or purging, the condition remains unresolved after seven to eight days, with heat結聚 (accumulating) in the interior, presenting with exterior-interior heat, frequent aversion to wind, severe thirst, dry tongue with irritability, and desire to drink several liters of water, Baihu Tang plus Renshen is indicated.

Zhang Luyu said: The exterior syndrome here is heavier than before; why use Baihu Tang plus Renshen? Only because heat accumulates in the interior does exterior heat persist; evil fire lurking inside causes aversion to wind, severe thirst, dry tongue, irritability, and incessant drinking. Under such circumstances, generating fluids and resolving heat must be urgent.

Shen Liangchen said: 'Dry and parched tongue' means visually lacking fluid. Thus, examining tongue coating to assess fluid status in warm diseases was already hinted at by Master Zhang.

When Taiyang is affected by Zhong Ye, the body feels hot, painful, and heavy, with a weak pulse. This is caused by injuring cold water in summer, with water circulating in the skin. It is treated with Yi Wu Gua Di Tang (Single Melon Spicule Decoction).

Huangfu Mi said: The *Neijing* states, 'Pulse surging with body cold comes from cold damage; pulse deficient with body heat comes from summerheat injury.' Generally, cold damages the form but not the Qi, hence the surging pulse; heat damages the Qi but not the form, hence the deficient pulse. Wang Mengyin notes: 'Body cold' here means although feverish, there is still aversion to cold, unlike summerheat diseases which prefer coolness and dislike heat.

Zhu Fengyi said: In summer, fever with aversion to cold, headache, and heavy pain in limbs/joints with a surging pulse is Hot Disease. In summer, spontaneous sweating with aversion to cold, body heat, and thirst with a weak pulse is Zhong Shu (Summerheat Stroke).

Wang Mengyin notes: The 'Hot Disease' in this note refers to latent pathogens erupting after the Summer Solstice, also called Summerheat Disease in the *Neijing*. 'Zhong Shu' is an external heat contraction in summer, also called Zhong Ye. Diseases differ internally and externally; pulses differ between surging and weak. The weak pulse is naturally a Zhong Ye pulse; only body heaviness is a sign of dampness. In the following section, although there is body heaviness, with open mouth and dry teeth, the heat is extremely intense, suggesting immediate use of sweet-cold fluids-nourishing formulas.

Zhang Luyu said: This section describes a disease caused by heat injuring cold, a variant of Zhong Ye. Yu Xi stated that if formless heat injures the Lung, use Baihu Tang plus Renshen to save it; if formed dampness injures the Lung, use Gua Di Tang to save it; each has its specific indication.

When Taiyang is affected by Zhong Ye, there is fever, aversion to cold, body heaviness, and pain. The pulse is string-taut, fine, knotted, and slow. After urination, one feels chilly with hair standing on end, and hands/feet are cold. Upon slight exertion, the body heats up, the mouth opens, and the anterior teeth become dry. If sweating is induced, aversion to cold becomes severe; if moxibustion/warming needles are applied, fever becomes severe; if purged repeatedly, strangury becomes severe.

Cheng Liaoshe said: Diseases can be in the exterior or interior; this case involves both. Fever, aversion to cold, body heaviness, and pain indicate Ye-pathogen in the exterior. String-taut, fine, knotted, and slow pulses indicate the deficient pulse of summerheat. Chilly sensation with hair standing on end after urination, and cold limbs, indicate insufficiency of Taiyang channel Qi. Heating up upon slight exertion means disturbing Yang leads to immediate manifestation. Mouth opening and dry anterior teeth indicate interior heat. The *Neijing* says: 'Due to summerheat sweating, irritability leads to panting and gasping.' Mouth opening refers to panting/gasping. Continuous panting causes dry anterior teeth. Sweating to remove exterior pathogen causes external Yang deficiency, worsening aversion to cold. Warming needles assisting Yang causes internal attack of fire-heat, worsening fever. Purging to remove interior heat causes internal deficiency and bladder dryness, worsening strangury.

Wang Mengyin notes: The single sign of dry anterior teeth already indicates blazing heat and depleted fluids. Although there is body heaviness and aversion to cold, how can one administer acrid-warm, drying, and fierce agents like Qingshu Yiqi Tang, Wuling San, or Huoxiang Zhengqi San to further rob Yin? Dongyuan and Xugu's words have misled many.

Furthermore, observing the three prohibitions (sweating, fire, purging), even without a prescribed formula, the necessity of using sweet-cool methods to withdraw heat and preserve fluids is self-evident. Zhao Shi and Fang Shi proposed using Baihu Tang plus Renshen, likely derived by analogy from Triple Yang combination disease, which seems reasonable.

Shen Yaofeng said: This section describes cases of Zhong Ye in individuals with inherent essence and Qi deficiency.