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After the Summer Solstice, intense heat and summer heat take command, and Ministerial Fire (Xianghuo) is in operation. If a person presents with fever, body pain, aversion to cold absent, but only severe heat and extreme thirst, this is termed Heat Disease (Rebing).
Zhang Zhongjing used Baihu Tang (White Tiger Decoction) as the primary treatment formula. It is erroneous for contemporary practitioners to use this decoction to treat Cold Damage (Shanghan). The pathogenic factors of Heat Disease emerge from within to without, or from lower to upper, and must pass through the Yangming channel. Therefore, regardless of whether it involves the three Yang channels, one should generally utilize the acrid-cool nature of Shigao (Gypsum Fibrosum) to ascend and disperse along the momentum, the bitter-cold nature of Zhimu (Anemarrhenae Rhizoma) to quell the source of latent pathogens in Shaoyin, and Gancao (Licorice Root) and Jingmi (Glutinous Rice) to sustain Middle Qi (Zhongqi). This approach achieves comprehensive resolution. As for Cold Damage, it does not occur in its proper season, nor is it this type of disease; the pathogen comes from outside. Those not yet entered into the interior should be resolved via the exterior (Jiebiao), while those already entered should be purged downward (Xiaduo). Gypsum is neither an exterior-resolving drug nor a purgative. Even if one wishes to resolve heat, how can heat be resolved? Moreover, with Anemarrhenae Rhizoma present, it guides the pathogen into Shaoyin, causing significant harm. The logic is self-evident. Those who are enlightened will understand on their own; I dare not indulge in debating with contemporaries. Thus, apart from the correct formulas for the aforementioned manifestations, supplementary treatment methods are collected here.

Method 1: The pulse of Heat Disease is originally flooding and large. If a floating-tight pulse appears, it indicates contraction of sudden cold during summer, termed "light lifting reveals tightness, slight pressing remains flooding and abundant," due to internal latent pathogens having erupted. Treatment should employ Tongjie San (Unblocking and Resolving Powder), removing Mahuang (Ephedrae Herba) and Cangzhu (Atractylodis Rhizoma), or adding Congbai (Allii Fistulosi Bulbus) and Chidouchi (Fermented Soybean). Alternatively, first administer Lianxu Congbai Chidou Tang (Scallion White and Fermented Soybean Decoction with roots), reducing Shengjiang (Zingiberis Rhizoma Recens) to scatter the exterior, followed by Baizhu Jia Renshen Tang (White Tiger Decoction plus Ginseng).

Method 2: For Heat Disease caused by external pathogens, regardless of whether the pulse is floating-tight, or there is aversion to wind and cold, where resolution via the exterior is indicated rather than purging, Shuangjie San (Double-Resolving Powder) with Xiaoshi (Natrii Sulfas) and Dahuang (Rhei Radix et Rhizoma) removed should be used generally, with modifications. Removing Baizhu (Atractylodis Macrocephalae Rhizoma), Shaoyao (Paeoniae Radix Alba), and Jiegeng (Platycodonis Radix) among others, and adding Zhimu (Anemarrhenae Rhizoma), Congbai (Allii Fistulosi Bulbus), and Chidou (Fermented Soybean) is most appropriate.

Method 3: Most Warm Disease (Wenbing) eruptions are caused by sudden cold, whereas Heat Disease eruptions are more prevalent when combined with summer heat. If initial symptoms include delirium, greasy facial complexion, urinary incontinence, and slight aversion to cold on the back, use Baizhu Jia Renshen Tang (White Tiger Decoction plus Ginseng).

Method 4: If the primary disease is accompanied by epistaxis, add Shengdihuang (Rehmanniae Radix) and Mudanpi (Moutan Cortex) to the base decoction. If wheezing occurs, add Gualougen (Trichosanthis Radix), Houpo (Magnoliae Officinalis Cortex), and Xingren (Armeniacae Semen Amarum).

Method 5: If there is aversion to heat, vexation and thirst, abdominal fullness, yellow-dry or black-dry tongue coating, and no bowel movement for five to six days, use Liangge San (Cooling the Diaphragm Powder) or Sanyi Chengqi Tang (Three-One Descending Qi Decoction).

Method 6: If the primary disease is complicated by summer-dampness, combine Liangge San (Cooling the Diaphragm Powder) with Tianshui San (Heavenly Water Powder). If urination is difficult, use Zhuye Shigao Tang (Bamboo Leaf and Gypsum Decoction) with doubled Shigao (Gypsum Fibrosum).

Method 7: If complicated by wind-phlegm, use Shuangjie San (Double-Resolving Powder). Decoct a large bowl, drink half first to induce vomiting, a method to draw phlegm out externally, then finish the remaining dose. Cover slightly with a blanket to induce sweating for resolution. Generally, taking cooling medicines hot induces sweating effectively without harm. Liu Wansu of Hejian formulated Shuangjie San (Double-Resolving Powder), and Zhang Congzheng (Zihe) ingeniously adapted it for emesis therapy.

Method 8: If mistaken use of acrid-warm drugs leads to macules, delirium, wheezing, fullness, and confusion, modify Huanglian Jiedu Tang (Coptis Decoction for Detoxification).

Method 9: If after repeated purging the heat intensity remains strong, making further purging inadvisable, or if various damp pathogens are abundant internally, presenting with yellow-astringent urine, loose stools, and lower abdominal pain indicating impending dysentery, use Huanglian Jiedu Tang (Coptis Decoction for Detoxification).