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。
内痈，是由于饮食没有节制，冷热失调，寒气侵入体内，或者停留在胸膈部位，或者停留在肠胃部位。寒气损伤血液，导致气血停滞，与寒气相互搏结，壅塞郁结而不得消散，热气趁机侵袭，于是化生为脓，所以称为内痈。
胸部内部疼痛，气息短少且伴有发热，应当进入昏暗的室内，用手按压左腿，如果右眼见到光亮，说明胸部内部有结痈；如果见不到光亮，则是疽在体内发作。如果出现呕吐脓血的症状，属于不可治愈的病症，应立即用灰烬覆盖其呕吐出的脓血，否则一旦沾染到人身上就会造成危害。肠道内部有结聚疼痛，或者在胁下，或者在肚脐左侧附近，结成块状并伴有高热，必定会形成痈脓。
诊察患者脉搏跳动快速，但身体没有发热的，说明体内有痈。
《养生方》说：四月不要食用突然宰杀的鸡肉，否则会引发内痈，位置在胸肋下方，会有脓液排出。
肺痈，是由于风寒邪气伤害肺部，导致肺气结聚而形成的。肺主司气，外候于皮毛，因劳累耗伤气血，腠理（皮肤毛孔）因此开放，从而受到风寒侵袭。对于肺气虚弱的人，寒邪趁虚伤害肺部，阻滞搏结于血脉之中，蕴积结聚而成痈；热气又叠加其上，积热不能消散，血液腐败化为脓液。
肺位于胸腔之间，起初肺受寒邪伤害，会出现轻微的咳嗽。肺痈的症状表现是：患者咳嗽，胸部内部胀满，隐隐作痛并伴有寒战。诊察患者的肺部脉象紧，即可诊断为肺痈。
另外，寸口脉象数而有力，咽喉干燥，口中感觉噼啪作响般的燥热，但不觉得口渴，时常吐出浑浊且带有腥臭味的唾液，时间久了吐出像粳米粥一样的脓液，这种情况难以治愈。
另外，肺痈患者体内有脓且伴有呕吐症状时，不需要治疗其呕吐，待脓液排尽后呕吐自然会停止。
另外，寸口脉象微而数，微脉代表风邪，数脉代表热邪；脉微则汗出，脉数则恶寒。风邪中伤卫分，呼气时邪气无法入内；热邪过于营分，吸气时邪气无法外出。风邪伤害皮毛，热邪伤害血脉；风邪留舍于肺，患者就会咳嗽、口干、气喘胸满、咽喉干燥但不渴、唾吐浊沫，时常寒战。热邪经过之处，血液凝滞，蓄积结聚成痈脓，吐出的脓液像米粥一样。疾病初起萌芽阶段还可以救治，一旦脓液形成则预后不良（致死）。
另外，想要判断是否有脓，如果脉象紧数，说明脓尚未形成；如果脉象紧象消失仅表现为数脉，说明脓已经形成。
另外，肺病患者身体应当发热，咳嗽气短，唾出脓血，其脉象应当短涩，反而出现浮大脉象；面色本当白色，反而呈现赤色，这是火克金的相克关系，属于大逆之证，难以治愈。
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.