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Xu Fan (Deficiency Irritability) refers to a condition where the patient has no significant high fever in the body, but feels a warm discomfort in the chest, with a desire to vomit that cannot be fulfilled, leading to internal disturbance and irritability. Although named "Deficiency Irritability," its etiology includes both cases caused by deficiency of healthy Qi and those caused by excess pathogenic factors. All are manifestations of pathogenic heat transmitting into the interior, and treatment should be differentiated accordingly.

If irritability arises from pathogenic heat transmitting to the Shaoyang (Lesser Yang) channel, as stated in the classic text: "In cold damage after five or six days, there is alternating chills and fever, irritability, and a tendency to vomit; or only irritability in the chest without vomiting, Xiao Chai Hu Tang (Minor Bupleurum Decoction) is the primary formula." This is because Shaoyang disease is neither suitable for sweating nor for purging if the interior is not yet solid. Therefore, Xiao Chai Hu Tang harmonizes both the exterior and interior. Once the exterior and interior are harmonized, the irritability naturally resolves.

In other cases, Yang-heat Qi sinks into the chest due to improper treatment, causing Xu Fan. The emetic method should be used to disperse the heat. As stated in the classic text: "After sweating, vomiting, or purging, if there is Xu Fan and insomnia; if severe, the patient tosses and turns restlessly and feels deep inner distress (Ao Nao), Zhi Zi Chi Tang (Gardenia and Fermented Soybean Decoction) is indicated. If there is shortness of breath, Zhi Zi Gan Cao Chi Tang (Gardenia, Licorice, and Fermented Soybean Decoction) is indicated. If there is vomiting, Zhi Zi Sheng Jiang Chi Tang (Gardenia, Ginger, and Fermented Soybean Decoction) is indicated. If there is irritability accompanied by abdominal fullness and restlessness day and night, Zhi Zi Hou Po Tang (Gardenia and Magnolia Bark Decoction) is indicated. Furthermore, if after cold damage, a physician mistakenly uses strong pill-based purgatives, resulting in persistent slight fever and mild irritability, Zhi Zi Gan Jiang Tang (Gardenia and Dried Ginger Decoction) is indicated." These formulas belong to the category of emetics. Modifications should be made based on accompanying symptoms. The emetic method contains the principle of dispersing, sufficient to raise the sinking Yang pathogen. This is the general principle for treating Xu Fan. For irritability caused by excess patterns, only vigorous emesis can resolve it. As stated in the classic text: "If the patient's hands and feet are cold, the pulse is tight below, indicating pathogenic accumulation in the chest, with chest fullness and irritability, hunger but inability to eat, the disease is in the chest and should be treated with emesis using Gua Di San (Melon Sepal Powder)." Thus, while both use emesis, their severity differs.

When the disease is in the chest, emesis is indicated. However, if there is stomach excess (Yangming Excess), emesis alone cannot resolve it. As stated in the classic text: "In Yangming disease, if irritability occurs without prior vomiting or purging, Tiao Wei Cheng Qi Tang (Regulate the Stomach and Direct to the Qi Decoction) is indicated." Yangming disease refers to "Stomach Home Excess" (excess heat and dryness in the stomach and intestines). Administering Tiao Wei Cheng Qi Tang clears the irritability through mild purgation, still embodying the principle of harmonization.

Fan Re (Irritable Heat) is irritability caused by heat, representing all Yang-heat patterns, with no Yin patterns involved. In contrast, Xu Fan includes both Yang and Yin diseases. As stated in the classic text: "In Shaoyin disease lasting two or three days, if there is heart irritability and inability to lie down, Huang Lian E Jiao Tang (Coptis and Donkey-Hide Gelatin Decoction) is indicated. If Shaoyin disease presents with chest fullness and irritability, Zhu Fu Tang (Pig Skin Decoction) is indicated. Also, if Shaoyin disease involves diarrhea for six or seven days, accompanied by cough, vomiting, thirst, irritability, and insomnia, Zhu Ling Tang (Polyporus Decoction) is indicated." This is because Shaoyang is the pivot of Yang, and Shaoyin is the pivot of Yin. Heat damaging Shaoyin consumes body fluids, and pathogenic heat disturbs the interior. Therefore, various methods to preserve Yin and clear irritability are applied according to accompanying symptoms, which also falls under the meaning of harmonization. Regarding Yin-cold patterns, irritability is seen as a sign of Yang recovery. Thus, it is said: "In Shaoyin disease, if there is aversion to cold and curling up, but occasional self-induced irritability with a desire to remove clothing and blankets, this indicates a treatable condition."

In Shaoyang disease, if there is irritability accompanied by palpitations, this belongs to the Stomach. When the Stomach is disharmonious, irritability and palpitations occur; treatment focuses on harmonizing the Stomach. Conversely, if palpitations precede irritability, as stated in the classic text: "In cold damage after two or three days, if there is heart palpitation and irritability, Xiao Jian Zhong Tang (Minor Construct the Middle Decoction) is indicated." Generally, irritability preceding palpitations indicates an Excess pattern, while palpitations preceding irritability indicate a Deficiency pattern. Tonifying deficiency and draining excess require different treatments.

Another symptom described is "Ao Nao" (Deep Inner Distress), which is more severe than irritability. Treatment should differentiate between emesis and purging based on the syndrome. As stated in the classic text: "In Yangming disease, if there is external heat, warm hands and feet, no formation of Jie Xiong (Chest Binding), heart Ao Nao, hunger but inability to eat, and sweating only on the head, Zhi Zi Chi Tang (Gardenia and Fermented Soybean Decoction) is indicated." This requires emesis. Also: "In Yangming disease, if there is heart Ao Nao and irritability, and dry fecal matter exists in the stomach/intestines, purging is possible." This requires purging. Additionally, there is irritability caused by Ascariasis Jue (Roundworm Cold-Reversal). As stated in the classic text: "In cold damage with roundworm Jue, the patient should vomit roundworms. The patient is quiet but occasionally irritable, indicating internal cold. The roundworms ascend to the diaphragm, causing irritability, which stops after a moment. Vomiting occurs after eating, followed by further irritability, as the roundworms emerge smelling food, and the patient may vomit roundworms spontaneously. Roundworm Jue is treated with Wu Mei Wan (Mume Pill)." This differs from heat stagnation due to intermittent irritability that recurs after eating. Careful differentiation is required during clinical practice.

For patients who have recovered but still experience irritability, as stated in the classic text: "After vomiting, purging, or sweating, if the pulse is peaceful but there is slight irritability, it is because the newly weakened body cannot handle the grain qi." Also: "If the patient's pulse has resolved but there is slight irritability at dusk, it is because the Spleen and Stomach are still weak and cannot digest food, causing slight irritability. Reducing food intake leads to recovery." In such cases, medication is unnecessary. Even if medication is used, it should only gently regulate the Spleen and Stomach. One must avoid using heat-clearing purgatives again to prevent further damaging Stomach Qi.