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Jieguo stated: Contracting the pathogen while at rest is termed *Zhongshu* (heatstroke), while contracting it during physical exertion is termed *Zhonger* (heat exhaustion); *Zhongshu* belongs to Yin syndromes, and *Zhonger* belongs to Yang syndromes. Dongyuan stated: Those who seek refuge from heat in deep halls and large buildings contract a disease named *Zhongshu*. The symptoms must include headache, aversion to cold, stiffness and tension of the body, pain in the limbs, irritability, high fever of the skin without sweating. This is caused by the yin-cold of the dwelling suppressing the body's yang qi, preventing it from ascending and dispersing; Da Shun San (Great Harmony Powder) is the primary formula. If pedestrians or farmers contract the disease while laboring under the midday sun, it is named *Zhonger*. The symptoms must include severe headache, agitation, aversion to heat, burning hot skin upon touch, extreme thirst with a desire to drink, profuse sweating, and lethargy due to qi deficiency. This results from heavenly heat injuring lung qi externally; Cangzhu Baizhu Tang (Atractylodes Macrocephala and White Tiger Decoction) is the primary formula. I privately disagree with this view. Essentially, summer heat is the governing climate of summer, prevalent between heaven and earth. Whether due to labor or hunger, if primordial qi is deficient and insufficient to resist the excessive heat of the season, injury occurs, resulting in illness. This is named *Zhongshu*, also named *Zhonger*; in reality, they are one and the same. Why then distinguish them based on movement versus stillness? Those suffering from summer heat illnesses are mostly laborers; labor leads to deficiency, and deficiency allows pathogens to enter. Once the pathogen enters, illness arises. If the body were not deficient, even excessive seasonal heat would have no way to injure it. Those who seek refuge in deep halls and suffer from headache and aversion to cold likely suffer from conditions similar to Cold Damage (*Shanghan*), and how can these be named *Zhongshu*? Their irritability and high skin fever arise because internal yang qi is suppressed by yin-cold, not because of summer-heat pathogens. To treat such cases, pungent-warm dispersing agents are indispensable. Using Da Shun San now, I fear it will fail to release the exterior and may instead increase internal irritability. Regarding Da Shun San, its original intent was established for cases of exposed to summer heat and latent heat, leading to excessive drinking, which caused the spleen and stomach to be affected by cold-dampness. Therefore, Licorice Root (*Gancao*) and Ginger (*Jiang*) are processed by fire, and Cinnamon Bark (*Rougui*) is used instead of Cinnamon Twig (*Guizhi*); these are warm medicines. The inclusion of Apricot Kernel (*Xingren*) merely utilizes its ability to direct qi downward. Nowadays, common people often misunderstand this, claiming that "yin qi resides inside during summer," making Da Shun San a mandatory remedy. Alas, is this error not grave? The so-called "yin qi" is not cold qi; rather, because summer yang qi disperses outward, yin qi resides inward. How can one treat "yin qi" as "cold qi" by using warm-hot medicines? If yin were truly cold, why do people drink water in summer? Although Baihu Tang (White Tiger Decoction) is suitable, it should not be regarded as a universal remedy. It must be combined with other formulas for treating summer heat and used according to the specific manifestations, thereby aligning with reason. As for the syndrome described as "contracted while at rest," although it occurs in the summer month, it is originally not a summer-heat syndrome. It should be treated separately to prevent future practitioners from being confused by seemingly similar yet distinct conditions.