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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: "For those with pathogenic factors, soak the body to induce sweating." When the pathogen is in the skin and hair layer, disperse it by inducing sweat. It also says: "The body feels like burning charcoal; once sweat is released, the heat dissipates." Furthermore, it states: "If the illness has not yet passed three days, it can be cured by inducing sweat." Citing these four instances, generally speaking, when the pathogen is at the exterior, it must not be allowed to penetrate deeply; the key is to eliminate it through sweating.

However, sweating can become a habitual practice due to overuse, or it can lead to complications due to neglect of protection. There are cases where excessive sweating leads to unceasing leakage of sweat, which indicates deficiency of Yang Qi and weakness of the exterior. Conversely, insufficient sweating allows the pathogen to contend again with the healthy Qi. As ancient scholars discussed, incomplete sweating may cause the condition to transfer to the Yangming disease pattern. In such cases, Yin and Yang fail to achieve balance, and Ying (Nutritive) and Wei (Defensive) Qi fail to harmonize.

Nevertheless, diseases differ between interior and exterior patterns, and sweating is indicated only in specific cases. If sweating is forced when not indicated, it will consume Body Fluids. If sweating is required but not administered, the pathogen will deepen its position and transmit through the meridians, becoming as unstoppable as wind and rain. Records in various medical texts are numerous. Generally, conditions suitable for sweating present with fever and a floating pulse, such as Taiyang disease and Yangming disease. Conditions unsuitable for sweating include Shaoyang disease and Jueyin disease in terms of meridian involvement, Jue syndrome and Ni syndrome in terms of disease nature, as well as epistaxis, sores, and stranguria. Even if the pathogen is at the exterior, if the pulse is deep and slow, sweating will not resolve the condition. Moreover, although Taiyang disease is typically treated with sweating, some patients develop Jing (Spasm) syndrome after improper sweating. Although floating pulse and body pain usually indicate treatment via sweating, if the pulse at the Cun position on the radial artery (Chicun) is slow, sweating is contraindicated. This is another point that must be known.

The Sanjiao (Triple Burner) serves as the official responsible for dredging water passages, regulating the ascending and descending of Chong Qi (Pulsating Qi) without cease. When the disease is located in the chest, causing Qi stagnation in the Upper Jiao, one must employ the method of vomiting (inducing emesis) because the pathogen is high up. This eliminates excess pathogens and guides the recovery of healthy Qi. Furthermore, for diseases in the Shangwan (Upper Epigastrium), where the pathology is upper and has not descended, it is crucial to remove it quickly. If not expelled via vomiting, the pathogen will penetrate into the stomach and intestines and spread to various meridians, making it difficult to treat. Therefore, retained food that is suitable for vomiting refers to cases where the food has not yet entered the stomach and intestines. Phlegm-malaria suitable for vomiting refers to phlegm-fluid retention stored in the chest and diaphragm. Food toxicity or foul qi suitable for vomiting is addressed to prevent the pathogen from lingering and worsening. Lung abscess or jaundice caused by alcohol suitable for vomiting is indicated due to chest fullness and mental oppression. Generally, when excess pathogens accumulate in the chest and cannot be dispersed by attacking methods or unblocked by promoting methods, sour and bitter medicines must be used to induce vomiting. Thus, the Stomach Qi remains undamaged, and the disease heals easily. The ancient principle states that vomiting is appropriate in spring, as spring Qi rises upward, leading to excess above and deficiency below, necessitating treatment targeting the upper region. Additionally, a floating pulse at the Cunkou (Radial Artery) indicates suitability for vomiting, as the disease is located above the diaphragm, preventing Qi from descending smoothly, resulting in a floating pulse. By carefully examining these two aspects, the application of the vomiting method should never be applied recklessly.