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Suddenly, the limbs undergo spasmodic convulsions and contracture, accompanied by loud groaning, opisthotonos (body bent backward like a bow), resembling the state of being struck by malignant evil; this is termed Summerheat Wind. There are also cases where heat disease precedes and worsens, gradually evolving into wind syndrome, characterized by delirious speech, manic shouting, and aimless running, with strength exceeding that of normal times by a hundredfold; this is Yang Wind. The treatment method involves using cold-natured drugs to attack and purge the pathogen, which differs from Yin Wind. Both types should be treated with methods that resolve the exterior and transform phlegm, avoiding sweating and purging therapies. If the disease persists for a long time leading to Spleen-Stomach deficiency, warm tonification is appropriate.

Lin's Commentary: Summerheat Wind is essentially Jing Syndrome (Spasm). When Jing Syndrome is severe, it leads to Jue Syndrome (Cold Extremities/Coma). In recent times, although there is emphasis on warming treatments for cold-induced conditions, greater importance is placed on formulas such as Angong Niuhuang Wan (Calculus Bovis Pill for Opening the Orifices), Zhibao Dan (Precious Treasure Pill), Qingying Tang (Clear the Nutritive Level Decoction), and Zixue San (Purple Snow Powder). These primarily address latent qi in Warm Diseases, and their treatment principles differ significantly from those for Spasm and Jue caused by Summerheat. The Classic states, "Diseases occurring before the Summer Solstice are called Warm diseases, while those occurring after are called Summerheat diseases." This is likely because at the Summer Solstice, Yin Qi begins to grow, and the Taiyin Damp Earth phase dominates. The interaction of Dampness, Fire, and Heat combines to form Summerheat, which differs from the Wood and Fire phases of Spring and Summer that trigger latent heat-warmth pathogens. Summerheat pathogenic factors enter through the mouth and nose, directly forcing the blood collaterals, stirring up internal wind. Wind and fire swirl together, creating an unstoppable momentum. This involves the combination of Shaoyang Ministerial Fire, Taiyin Damp Earth, and Jueyin Wind Wood. As these three pathogens rush erratically, they cause Spasm and Jue. The Hand-Shaoyang Sanjiao Ministerial Fire connects with the Hand-Jueyin Pericardium. When Summerheat-heat pathogens invade internally, they attract Ministerial Fire; when fire moves, wind arises, causing Liver Wood to lose nourishment, resulting in tendon contracture and vessel tension. When wind fans the flames, the Pericardium suffers evil, leading to mental confusion and coma. The body's Qi follows the wind and fire upward, rising without descending, losing its normal rhythm, thus appearing like Corpse Jue. This corresponds to what the Neijing describes: "When blood and Qi rush together to the upper part, sudden Jue occurs." External invasion of meridians results in Spasm, while internal pressure on the Danzhong (Chest) results in Jue. Treatment must quickly extinguish wind and drain fire, unblock collaterals, and soothe the Liver, urgently curbing the momentum to calm the violence, preventing the consumption of Stomach fluids. In severe cases, the method of "drawing firewood from under the cauldron" (treating the root cause) should be used, employing Baitouweng Tang (Pulsatilla Decoction) according to the situation to directly suppress the excess of Jue and Shao. Once the momentum subsides slightly, one should consider clearing and unblocking the Pericardium, gradually administering agents that transform phlegm, nourish Yin, and clear dampness. This is the standard treatment. Furthermore, if Summerheat pathogenic factors reach extreme heat, presenting with a faint yet restless pulse, cold limbs and skin, red face, shortness of breath, continuous profuse sweating but a moist tongue, or hand contracture and mental clouding/coma, this indicates that pathogenic heat is forcing sweat, constituting a syndrome of Yang floating outward. Urgent treatment with Renshen (Ginseng Root) and Fuzi (Prepared Aconite Root) combined with Tongbian (Child's Urine) is required to restore Yang. After recovery, Summerheat-clearing and Yin-nourishing agents should be used to conclude the treatment. Otherwise, Yang collapse will be incurable. However, if the symptoms do not include a faint pulse, cold feet, sweating, and a moist tongue, it remains a heat syndrome; misusing Renshen and Fuzi will lead to death. Without true insight, one must not experiment lightly, though this knowledge is essential.