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The method for preventing epidemics lies in restraining desires and avoiding overexertion, while not enduring hunger to prevent contracting the epidemic qi. ○ The Gallbladder is referred to as the "Official of Uprightness." When the Qi of the Gallbladder is robust, the Qi of the other eleven meridians relies on it to become robust as well, preventing pathogenic factors from entering. ○ *Yi Tong* states: For men, pathogenic factors enter through the mouth; for women, they enter through the anterior yin (genitals). During face-to-face sitting, one must be aware of the orientation (facing or turning away), or apply Realgar (Xionghuang) into the nostrils, calmly observe the position, and then enter.

Jin Dynasty physician Zhang Jiegou stated that contracting heat due to activity is called "Zhong Re" (Heat Stroke/Heat Exhaustion), while contracting it due to stillness is called "Zhong Shu" (Summerheat Stroke). Summerheat is Yin and Heat is Yang; thus, this naming convention is somewhat inaccurate. Generally, during the scorching summer days, human exposure to it generates summerheat disease, which is Zhong Re, invariably resulting from activity. Other scenarios include fearing heat and seeking coolness; if cool air invades the exterior, symptoms such as fever, aversion to cold, headache, and stiff neck arise, suitable for dispersal with Jiwei Qianghuo Tang (Nine-Ingredient Notopterygia Decoction). If coolness invades the interior, symptoms such as vomiting, diarrhea, and abdominal pain arise, suitable for warming with Lizhong Tang (Regulate the Middle Decoction). If accompanied by irritability, Dashun San (Great Smooth Powder) may be intermittently taken with cool water. Although the illness manifests during the summer months, it should not necessarily be named a summerheat disease. Broadly speaking, the diagnostic criteria for summerheat syndromes are thirst, mental restlessness, red urine, body heat, and a pulse that is flooding yet empty. Mild cases are termed "Shang Shu" (Injury by Summerheat); Liuyi San (Six-One Powder) is used to cleanse heat qi, excreting it via urination. If summerheat and dryness are closed and depressed without sweating, Xiangru Yin (Mosla Decoction) must be used to vent Yang Qi, penetrating from top to bottom, resolving the exterior and promoting diuresis simultaneously, leading to recovery. Severe cases are termed "Zhong Shu" (Struck by Summerheat), characterized by extreme thirst and profuse sweating, primarily treated with Baihu Jia Renshen Tang (White Tiger Plus Ginseng Decoction). If there is sweating followed by body heat but coldness in both feet, this indicates summerheat complicated by dampness, primarily treated with Baihu Jia Cangzhu Tang (White Tiger Plus Atractylodes Macrocephala Decoction). In cases of summerheat causing coma and unresponsiveness, or latent summerheat with food stagnation leading to vomiting and diarrhea, use Banxia (Pinellia Rhizome) 4 liang (boiled in vinegar), Fuling (Poria), and Gancao (Licorice Root) each 2 liang. Grind them into powder, form pills using fresh ginger juice, sized like mung beans. Take 50–60 pills per dose with warm water. If the patient is comatose and unresponsive, crush the pills and administer them directly, resulting in immediate revival. This is the divine prescription of Sun Simiao. (Named Xiaoshu Wan (Summer-heat Eliminating Pill), it is the premier divine prescription for summerheat syndromes.) As for Shengmai San (Generate the Pulse Powder) and Qingshu Yiqi Tang (Clear Summerheat and Boost Qi Decoction), these were established for summerheat damaging Yuan Qi (Primal Qi). They may be taken prophylactically to ward off summerheat or post-recovery to consolidate results; they are not primary formulas for treating acute summerheat disease.