内痈者，由饮食不节，冷热不调，寒气客于内，或在胸膈，或在肠胃。寒折于血，血气
留止，与寒相搏，壅结不散，热气乘之，则化为脓，故曰内痈也。
胸内痛，少气而发热，当入暗室中，以手按左腿，而其右眼见光者，胸内结痈也；若不
见光， 疽内发。若吐脓血者，不可治也，急以灰掩其脓血，不尔才着人。肠内有结痛
，或在胁下，或在脐左近，结成块而壮热，必作痈脓。
诊其脉数，而身无热者，内有痈。
《养生方》云∶四月勿食暴鸡肉，作内痈，在胸掖下，出 也。
肺痈者，由风寒伤于肺，其气结聚所成也。肺主气，候皮毛，劳伤血气，腠理则开，而
受风寒。其气虚者，寒乘虚伤肺，塞搏于血，蕴结成痈；热又加之，积热不散，血败为脓。
肺处胸间，初肺伤于寒，则微嗽。肺痈之状，其人咳，胸内满，隐隐痛而战寒。诊其肺
部脉紧，为肺痈。
又，寸口脉数而实，咽干，口内辟辟燥，不渴，时时出浊唾腥臭，久久吐脓如粳米粥者
，难治也。
又，肺痈喘而胸满。
又，肺痈有脓而呕者，不须治其呕，脓止自愈。
又，寸口脉微而数，微则为风，数则为热；微则汗出，数则恶寒。风中于卫，呼气不入
；热过于荣，吸而不出。风伤皮毛，热伤血脉；风舍于肺，其人则咳，口干喘满，咽燥不渴
，唾而浊沫，时时战寒。热之所过，血为凝滞，蓄结痈脓，吐如米粥。始萌可救，脓成则死
又，欲知有脓者，其脉紧数，脓为未成；其脉紧去但数，脓为已成。
又，肺病身当有热，咳嗽短气，唾出脓血，其脉当短涩，而反浮大，其色当白，而反赤
者，此是火之克金，大逆不治也。
Internal carbuncle (Nei Yong) arises from irregular diet and imbalance of cold and heat, where cold pathogenic qi invades the interior, residing either in the chest and diaphragm or in the intestines and stomach. The cold damages the blood, causing Qi and Blood to stagnate and accumulate. As they contend with the cold, they become obstructed and knotted without dispersing. When hot pathogenic qi takes advantage of this condition, it transforms into pus; hence it is called internal carbuncle.
Symptoms include pain inside the chest, shortness of breath, and fever. One should enter a dark room, press the left leg with the hand, and if light is seen in the right eye, it indicates an internal carbuncle in the chest; if no light is seen, it indicates an internal development of a deep abscess (Ju). If vomiting of pus and blood occurs, it is incurable. Immediately cover the vomited pus and blood with ash; otherwise, contact with humans will cause harm. Painful knotting within the intestines may occur in the hypochondrium or near the left umbilicus, forming a mass accompanied by high fever, inevitably leading to carbuncle and pus formation.
If the pulse is rapid but the body has no fever, there is an internal carbuncle.
The *Yangsheng Fang* states: In the fourth month, do not consume suddenly slaughtered chicken meat, as it causes internal carbuncles located below the chest and ribs, resulting in the discharge of pus.
Lung carbuncle (Fei Yong) is formed by wind-cold damaging the lung, leading to the aggregation of Qi. The Lung governs Qi and manifests on the skin and hair. Laborious overexertion damages Qi and Blood, causing the interstices (Cou Li) to open, thereby allowing wind-cold invasion. In cases of deficient Lung Qi, cold pathogenic qi exploits the deficiency to damage the Lung, obstructing and contending with the blood, accumulating and knotting to form a carbuncle; when heat is added, accumulated heat fails to dissipate, and the blood rots to become pus.
Located in the chest, initially when the Lung is damaged by cold, slight coughing occurs. The presentation of lung carbuncle includes cough, fullness inside the chest, dull pain, and chills. Palpation of the Lung region reveals a tight pulse, diagnosing lung carbuncle.
Furthermore, if the Cun Kou pulse is rapid and excess (Shi), with dry throat, a crackling dry sensation in the mouth without thirst, and frequent expectoration of turbid, foul-smelling saliva, progressing to expectorating pus resembling rice porridge after a long time, it is difficult to treat.
Furthermore, lung carbuncle presents with wheezing and chest fullness.
Furthermore, if lung carbuncle involves pus and vomiting, there is no need to treat the vomiting specifically; once the pus stops, the vomiting will resolve spontaneously.
Furthermore, if the Cun Kou pulse is faint (Wei) and rapid, the faintness indicates wind, and the rapidness indicates heat; faintness leads to sweating, and rapidness leads to aversion to cold. Wind damages the Wei (Defensive) level, so exhalation does not allow entry; heat overwhelms the Ying (Nutritive) level, so inhalation does not allow exit. Wind damages the skin and hair, while heat damages the vessels and blood; wind lodges in the Lung, causing cough, dry mouth, wheezing, and chest fullness, dry throat without thirst, expectoration of turbid froth, and frequent chills. Wherever heat passes, blood becomes stagnant, accumulating and knotting into carbuncle pus, which is expectorated like rice porridge. In the initial budding stage, it can be saved; once pus is formed, it is fatal.
Furthermore, to determine if pus exists: if the pulse is tight and rapid, the pus has not yet formed; if the tightness disappears and only rapidness remains, the pus has already formed.
Furthermore, in lung disease, the body should have fever, cough, shortness of breath, and expectoration of pus and blood. The pulse should be short and choppy (Du Se); if it is instead floating and large, and the complexion should be white but is instead red, this represents Fire overcoming Metal, a major reversal indicating an incurable condition.