太阳病，恶寒而发热，今自汗出，反不恶寒而发热，关上脉细而数，此吐之过也。
少阴病，其人饮食入则吐，心中温温欲吐，复不能吐，始得之，手足寒，脉弦运，若膈
上有寒饮，干呕，忌吐，当温之。
诸四逆病厥，忌吐，虚家亦然。
大法春宜吐。
凡服吐汤，中病便止，不必尽剂也。
病如桂枝证，其头项不强痛，寸口脉浮，胸中痞坚，上撞咽喉不得息，此为有寒，宜吐
之。
病胸上诸实，胸中郁郁而痛，不能食，欲使人按之，而反有涎唾下利，日十余行，其脉
反迟，寸口微滑，此宜吐之，利即止。
少阴病，其人饮食入则吐，心中温温欲吐，复不能吐，宜吐之。
病者手足逆冷，脉乍紧，邪结在胸中，心下满而烦，饥不能食，病在胸中，宜吐之。
宿食在上管，宜吐之。
咽中闭塞，忌下，下之则上轻下重，水浆不下。诸外实忌下，下之皆发微热，亡脉则厥
诸虚忌下，下之则渴，引水易愈，恶水者剧。
脉数者忌下，下之必烦，利不止。
尺中弱涩者，复忌下。
脉浮大，医反下之，此为大逆。
太阳证不罢，忌下，下之为逆。
结胸证，其脉浮大，忌下，下之即死。
太阳与阳明合病，喘而胸满者，忌下。
太阳与少阳合病，心下痞坚，颈项强而眩，忌下。
凡四逆病厥者，忌下，虚家亦然。
病欲吐者忌下。
病有外证未解，忌下，下之为逆。
少阴病，食入即吐，心中温温欲死，复不能吐。始得之，手足寒，脉弦迟，此胸中实，
忌下。
伤寒五六日，不结胸，腹濡，脉虚复厥者，忌下。下之亡血则死。
Taiyang disease (disease of the Taiyang channel), characterized by aversion to cold and fever, now presents with spontaneous sweating, contrary absence of aversion to cold but presence of fever, with a fine and rapid pulse at the Guan position; this is an error caused by improper use of emesis.
Shaoyin disease (disease of the Shaoyin channel): The patient vomits immediately after eating or drinking, feels nauseous in the heart region but cannot actually vomit. At the onset, the hands and feet are cold, and the pulse is wiry accompanied by dizziness. If there is cold-fluid retention above the diaphragm causing dry heaving, emesis is contraindicated; instead, warming methods should be employed.
For all cases of Sini disease (Four-Chill disease) presenting with Jue (extremity coldness), emesis is contraindicated; the same applies to patients with deficiency constitutions.
The general principle states that emesis is suitable in spring.
When administering emetic decoctions, stop once the illness is resolved; it is not necessary to consume the entire dose.
If the symptoms resemble those of Guizhi Tang (Cinnamon Twig Decoction) syndrome, but without stiffness and pain in the head and neck, with a floating pulse at the Cun Kou (radial artery) position, and hardness/stagnation in the chest with Qi rushing up to the throat obstructing breathing, this indicates the presence of cold pathogen, and emesis is indicated.
For various excess conditions located above the chest, characterized by stifling pain in the chest, inability to eat, desire for abdominal/chest pressure, accompanied by excessive saliva/phlegm and diarrhea occurring more than ten times a day, with a surprisingly slow pulse and slightly slippery pulse at the Cun Kou position, emesis is indicated, and the diarrhea will cease immediately.
Shaoyin disease: The patient vomits immediately after eating or drinking, feels nauseous in the heart region but cannot actually vomit; emesis is indicated.
The patient presents with inverted coldness of the hands and feet, a suddenly tight pulse, pathogenic factors knotted in the chest, fullness and irritability below the heart, hunger but inability to eat. Since the disease is located in the chest, emesis is indicated.
Retained food stagnating in the upper Jiao (Upper Burner/Epigastrium) requires emesis.
Obstruction in the throat is contraindicated for purgation (downward draining). Improper purgation leads to a sensation of lightness above and heaviness below, resulting in the inability to swallow fluids. All exterior excess conditions are contraindicated for purgation; improper purgation causes slight fever, and if the pulse disappears, Jue (extremity coldness) occurs. All deficiency conditions are contraindicated for purgation; improper purgation causes thirst. If the patient desires water, recovery is likely; if the patient abhors water, the condition worsens.
A rapid pulse is contraindicated for purgation; improper purgation causes irritability and unceasing diarrhea.
A weak and choppy pulse at the Chi position is also contraindicated for purgation.
A floating and large pulse, if treated with purgation by the physician, constitutes a major therapeutic error (Ni).
If Taiyang syndrome has not resolved, purgation is contraindicated; improper purgation is considered Ni (adverse/rebellious treatment).
Jie Xiong syndrome (Chest Binding syndrome) with a floating and large pulse is contraindicated for purgation; improper purgation leads to death.
Combined disease of Taiyang and Yangming, presenting with wheezing and chest fullness, is contraindicated for purgation.
Combined disease of Taiyang and Shaoyang, presenting with hardness/stagnation below the heart, stiffness of the neck, and dizziness, is contraindicated for purgation.
All cases of Sini disease with Jue (extremity coldness) are contraindicated for purgation; the same applies to patients with deficiency constitutions.
Conditions where the patient desires to vomit are contraindicated for purgation.
Conditions where exterior signs have not yet resolved are contraindicated for purgation; improper purgation is considered Ni.
Shaoyin disease: Food is vomited immediately upon entry, the patient feels nauseous to the point of despair in the heart region but cannot vomit. At the onset, the hands and feet are cold, and the pulse is wiry and slow. This indicates excess in the chest; purgation is contraindicated.
After five or six days of Shanghan (Cold Damage), if there is no Jie Xiong syndrome, the abdomen is soft, the pulse is deficient, and there is Jue (extremity coldness), purgation is contraindicated. Improper purgation leading to loss of blood results in death.