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During the bitter heat of summer, healthy individuals who seek to avoid the heat by resting in deep halls and large mansions, cool pavilions, or cold chambers, or by using large fans and windmills to generate breeze, contract what is termed "yin syndrome obtained through stillness" (Jing De Zhi Yin Zheng). The symptoms necessarily include headache, aversion to cold, bodily stiffness and tension, pain in the limbs and joints, mental restlessness, high fever of the skin and flesh without sweating. This occurs because yin-cold pathogens restrain the body, preventing the universal yang qi from extending and rising. It is appropriate to use acrid-warm formulas to release the exterior and disperse cold. Herbs such as Magnoliae Officinalis Cortex (Nanpu), Perillae Folium (Zisu), Puerariae Radix (Gange), Pogostemonis Herba (Huoxiang), Notopterygii Rhizoma et Radix (Qianghuo), and Atractylodis Rhizoma (Cangzhu) may be selected. If the exterior has been invaded by cold and the interior simultaneously injured by consuming ice water and raw/cold fruits and vegetables, Dried Ginger (Ganjiang), Amomi Fructus (Suosha), and Mass Medicae Fermentatae (Shenqu) should be added to the aforementioned herbs. These are not treatments for the summerheat pathogen itself, but rather treatments for diseases caused by the conditions of summer.

Note: The distinction between "obtained through stillness" and "obtained through movement," corresponding to severe summerheat (Zhong Shu) and mild summerheat injury (Shang Shu), originates from Zhang Jiegou, a theory subsequently adopted by later generations. However, during the height of summer, the blazing fire feels like roasting; everywhere is hot. Thus, ancients spoke of avoiding summerheat but never of avoiding cold. Deep halls and broad mansions are precisely for avoiding summerheat; how could one enter them and be harmed by cold? Moreover, the coolness of rooms and houses serves to protect yang qi; how could it restrain or injure it? Even within luxurious dwellings, there must inevitably be instances of venturing out into the heat for social engagements; those who suffer from summerheat injury acquire it through movement. Laozi stated, "If humans can maintain constant clarity and stillness, heaven and earth will all return to unity." Stillness itself can dispel summerheat; how could one contract summerheat from it? As for cold items like ice water and fruits, excessive consumption naturally damages the spleen and stomach, generating various miscellaneous syndromes, such as diarrhea and dysentery. It is acceptable to say that accumulation of these items internally causes such issues; however, claiming they specifically cause summerheat disease is incorrect. If one insists on treating oral intake of cold items and physical exposure to cold air by applying the same methods used for winter cold diseases, the error would be thousands of miles wide.

Cold damages the form (xing), while heat damages qi. Why is this so? Humans and heaven and earth share the same structure (tuoyue). In summer, heavenly qi floats on the earth's surface, so human qi floats on the muscular exterior. Furthermore, when injured by intense summerheat, the skin pores become open and sparse, and qi and fluids transform into sweat, excreting externally. Consequently, both exterior and interior qi become deficient. Those unskilled in self-care allow summerheat to damage them externally and raw/cold foods to harm them internally; how can digestion and transformation function properly? Therefore, food and water stagnate and accumulate, transforming into damp-heat, manifesting as vomiting and diarrhea. In severe cases, both vomiting and diarrhea occur simultaneously, accompanied by abdominal colic and mental confusion. If illness does not appear immediately, damp-heat lingers and stifles internally, eventually evolving into malaria or dysentery at a later date. The current formula, Dashun San (Great Harmony Powder), is not a medicine for treating summerheat-heat, but rather a prescription for illnesses caused by excessive consumption of cool drinks during the summer months.