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Sudden collapse due to heatstroke without a specific name is called "Shu Feng" (Summerheat Wind). Generally, it divides into two categories: excess and deficiency. The excess type is an excess of phlegm; usually, there is accumulated phlegm filling the meridians. Once affected by summerheat-dampness, the phlegm obstructs the Qi mechanism, causing sudden collapse and salivation. This is a combined disease of dampness and summerheat, which is the most severe. It is advisable to first induce vomiting to expel the phlegm, then clear the summerheat, which is relatively easier to treat.

The deficiency type is a deficiency of Yang; usually, Yang Qi is weak and unvigorous, with Yin-cold having dominated for a long time. Once affected by intense summerheat, pathogenic factors invade the deficiency. This is a dampness disease originating from internal deficiency-cold. It is advisable to use herbs that restore Yang while simultaneously clearing summerheat, which is the most difficult to treat.

Note: In the *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet), terms like "Re Zhong" (Heat Centering) are all references to summerheat diseases, but the manifestations differ. Zhang Jiegu said: "Zhong Shu" (Heatstroke) belongs to Yin syndromes, while "Zhong Re" (Heat Stroke/Excess Heat) belongs to Yang syndromes. Heatstroke occurs due to indulging in cooling behaviors, where Yang Qi is suppressed by Yin pathogens. Symptoms include fever, headache, aversion to cold, and absence of sweating (with body stiffness, tightness, soreness, and pain); treatment should involve releasing the exterior with adjunctive clearing of summerheat. Heat stroke/excess heat results from labor under the midday sun, exposing the body to summerheat. Symptoms include headache, high fever, extreme thirst with desire to drink, irritability, sweating, lethargy, abdominal pain, watery diarrhea, and nausea. This indicates heat injuring the Qi, affecting the Lung and Large Intestine; treatment should involve cooling methods to resolve summerheat toxicity. Currently, sudden collapse with convulsions of the hands and feet is named "Shu Feng." This is caused by excessive Fire in summer scorching Metal (Lung), leading to hyperactive Wood (Liver) generating Wind, and affecting Earth (Spleen). It must not be mistakenly treated with wind-dispelling drugs. Cold reversal of the hands and feet is named "Shu Jue" (Summerheat Collapse). This is generally caused by seasonal Fire being extremely constrained internally and unable to extend or diffuse. The *Ru Men* (Introduction) states that Shu Jue is simply summerheat disease accompanied by cold reversal of the extremities.

In the *Kou Wen* chapter of the *Ling Shu* (Spiritual Pivot), Qibo said: When food enters the stomach, Stomach Qi flows upward to the Lung. If old cold pathogens and new grain Qi both return to the stomach, the new and old become confused, Zhen Qi (True Qi) and Xie Qi (Pathogenic Qi) attack each other, Qi merges and reverses, and re-emerges from the stomach; thus, hiccup (Yue) occurs. ○ The Lung governs hiccup. Select Tai Yuan (LU-9) of the Hand-Taiyin Lung Meridian, and Yu Fu (KI-14) and Shi Guan (KI-15) of the Foot-Shaoyin Kidney Meridian.

Ou (Vomit) and Tu (Regurgitate/Eject) belong to the same category. However, vomiting without ejecting matter is called "Ou," while vomiting with ejected matter is called "Tu." Abdominal distension and belching are called "Yi." "Yi" refers to the sigh after a full meal, i.e., belching.

Continuous "e-e" sounds are called "Yue," now referred to as hiccup. Hiccup originating from the Middle Jiao has a light and short sound, caused by disorders of water and grain. Hiccup originating from the Lower Jiao has a harsh and long sound, caused by the struggle between deficient and pathogenic factors.