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Xue Lizhai stated: Vomiting acid and swallowing acid are generally different. Vomiting acid arises from heat generated within dampness, while swallowing acid results from internal stagnation of deficient heat; both belong to deficiency-cold of the Spleen and Stomach, representing a late-stage manifestation of the disease. Therefore, the *Neijing* (Classic of Internal Medicine) considers it a "Fire" syndrome, referring to its external pathological presentation; Li Dongyuan considers it Stomach Cold, referring to the root cause of the disease. For those suffering from this condition, treatment should first distinguish between vomiting and swallowing, focusing on consolidating the Yuan Qi (Original Qi). If cold-cooling herbs are administered, further damaging the Stomach Qi, it will lead to erroneous treatment where excess becomes more excessive and deficiency becomes more deficient. Furthermore, if one examines that Spleen Qi is deficient, leading to an inability to transport and transform food and drink, and turbid Qi fails to descend, the Six Gentlemen Decoction (Liujunzi Tang) should be used primarily to tonify and nourish the Spleen and Stomach, with a small addition of Yueju Pill (Yueju Wan) to clear middle-jiao stagnation. Thus, Master Li Dongyuan said: "Pathogenic heat cannot digest grains." If mistakenly identified as excess heat and cold-cooling herbs are recklessly used, it will inevitably lead to a deteriorated syndrome.

Erchen Tang (Harmonizing Class, Formula 17), Pingwei San (Harmonizing Class, Formula 17), Liujunzi Tang (Tonifying Class, Formula 5), Wenwei Yin (New Heat Class, Formula 5), Hewei Yin (New Harmonizing Class, Formula 5), Jiajian Erchen Tang (Harmonizing Class, Formula 2), Shengshu Jian (New Heat Class, Formula 25), Lizhong Tang (Heat Class, Formula 1), Linyin Jian (New Heat Class, Formula 3), Eryu Erchen Tang (Harmonizing Class, Formula 4), Jupi Tang (Harmonizing Class, Formula 11), Yueju Wan (Harmonizing Class, Formulas 1 & 154), Huoxiang Anwei San (Heat Class, Formula 71).

Qushu Wan (Harmonizing Class, Formula 110, for retained food), Chenxiang Jiangqi San (Harmonizing Class, Formula 40, for Qi stagnation), Banxia Dingxiang Wan (Harmonizing Class, Formula 130, for cold stagnation), Zhulian Wan (Cold Class, Formula 153, for damp-heat), Anpi San (Heat Class, Formulas 6-7, for Stomach cold), Dingxiang Fuling Tang (Heat Class, Formula 63, warming Stomach and promoting Qi movement), Beishu Wan (Heat Class, Formula 146, for fluid retention).

The syndrome of regurgitation (Fanwei) essentially belongs to Fire deficiency. When food enters the Stomach, if the Stomach is warm and the Spleen is strong, the food will surely be digested; how could it be vomited out? Current theories by various schools suggest it is due to Phlegm or Heat. However, they do not realize that the retention of Phlegm and fluids is precisely because of Stomach deficiency causing undigested food to be regurgitated; how can there still be Heat? As Wang Taipu (Wang Bing) stated: "Internal obstruction with vomiting and reversal, where food cannot enter, indicates the presence of Fire; vomiting and regurgitating after eating, where food comes back out, indicates the absence of Fire." This statement truly exhausts the principle. Nevertheless, the cause of "absence of Fire" still requires differentiation among the Upper, Middle, and Lower Jiao (Triple Burners), which must be carefully observed. If Cold is in the Upper Jiao, it often manifests as nausea or a general desire to vomit, indicating Yang deficiency in the Epigastrium. If Cold is in the Middle Jiao, food enters but is not digested; upon reaching the Zhongwan point, shortly after or half a day later, it is regurgitated, indicating Yang deficiency within the Stomach. If Cold is in the Lower Jiao, morning food is vomited in the evening, or evening food is vomited in the morning. This occurs because when food enters the幽门 (Pylorus), the Bing Fire (Mingmen Fire) cannot transmit and transform it, so it is eventually regurgitated, indicating Yang deficiency of the Mingmen (Gate of Life). Therefore, in treating this condition, if one does not know the root of the disease, guesses blindly, and recklessly hopes for efficacy, success will be difficult to achieve.