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After sweating, if water and medicine cannot be taken into the mouth, it is considered a *ni* (adverse/rebellious condition); if sweating is induced again, vomiting and diarrhea will inevitably continue without stopping.

Sweating causes the leakage of *Yang Qi* (Vital Energy), the failure of *Earth* (Spleen/Stomach function), and the rebellion of *Stomach Qi* (Stomach Energy), resulting in the inability to ingest water and medicine; this is termed "adverse." If sweating is induced again, *Yang Qi* will fail and *Earth* will collapse, causing the symptoms of *Taiyin Disease* (a syndrome characterized by Spleen deficiency and cold-dampness) such as vomiting and diarrhea to manifest fully, with no end in sight.

If a patient has a rapid pulse (*Shu Mai*), which indicates heat and should theoretically allow for the digestion of food and induce hunger, yet they vomit instead, this is because sweating has caused *Yang Qi* to become weak and *Ge Qi* (Qi at the diaphragm/chest) to become deficient, leading to the rapid pulse. This rapid pulse represents "guest heat" (floating false heat) that cannot digest food, due to cold deficiency in the Stomach, hence the vomiting.

Yin and Yang are mutually rooted. When *Yang Qi* is deficient, its root is lost, causing it to float upward, resulting in a rapid pulse. This rapid pulse is guest heat floating upward, unable to transform water and grain, thus causing vomiting; the root cause is the loss of *Yang Qi* and cold deficiency in the Stomach.

In *Taiyang Disease* (Sun-Yang Disease, an exterior syndrome), if emesis is induced, although Taiyang disease typically presents with aversion to cold, the patient now shows no aversion to cold and dislikes wearing clothes. This is internal irritability (*Nei Fan*) caused by the adverse effect of emesis.

*Taiyang Disease*, whether Cold Damage or Wind Strike, involves exterior pathogenic closure preventing the circulation of *Ying Qi* (Nutritive Energy) and *Wei Qi* (Defensive Energy), typically presenting with aversion to cold. Emesis injures *Stomach Qi*, causing interior *Yang* to rebel upward and reach the skin and hair, resulting in no aversion to cold and a desire to remove clothing/bedding. This is because emesis causes *Yang Fire* to lose its root, leading to internal irritability.

*Taiyang Disease* should present with aversion to cold and fever. Now, the patient has spontaneous sweating, no aversion to cold, no fever, and a fine and rapid pulse at the *Guan* position (middle position on the radial artery). This is the fault of the physician inducing emesis. If emesis is induced on the first or second day, the patient feels hungry in the abdomen but cannot eat; if induced on the third or fourth day, the patient dislikes congee and desires cold food, vomiting what was eaten in the morning by evening. All these are caused by the physician's erroneous use of emesis. This is called "minor adverse" (*Xiao Ni*).

Emesis injures *Stomach Yang*, making it floating and rootless, hence the fine and rapid pulse at the Guan position. On days one or two, the Stomach disease is shallow, and the injury from emesis is light; the Stomach is deficient and empty, causing hunger, but rebellious Stomach Qi prevents eating. On days three or four, the Stomach disease is deep, and the injury from emesis is heavy; *Yang Fire* is floating and deficient, so the patient dislikes congee and desires cold food. However, due to cold deficiency in the Stomach, grain cannot be transformed, leading to morning intake and evening vomiting. This is also "over-emesis injuring the Stomach," termed "minor adverse." Later, the slight *Yang Qi* will recover, and the rebellious Qi will descend. Among adverse conditions caused by sweating, emesis, purging, and warm needle therapy, emesis is the mildest. Wherever there is corruption and obstruction in the chest and abdomen, blocking true *Yang*, causing depression, restlessness, headache, and heart irritability, using emesis to clear the clear Qi provides immediate relief and comfort; this is the best method. Even if excessive emesis leads to middle Qi deficiency and internal irritability, it does not carry the disaster of Yang collapse caused by sweating or purging. Simply warming and tonifying the middle Qi will immediately stop the deficiency irritability; it is easy to treat, hence termed "minor adverse."