巢氏曰∶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，腠理开
而受邪，气虚者，邪乘虚伤肺，寒搏于血，蕴结成痈，积热不散，败血为脓。其人咳，胸内满，
隐隐痛而战，咽干，口内辟辟燥
不渴，时时出浊唾腥臭，久久吐脓如米粥者，难治。又云∶风中于卫，呼气不入，数过于荣，
吸而不出。风伤皮毛；热伤血脉。风舍于肺，其人则呕，口干喘满，咽燥不渴，唾而浊沫，
时时战寒。热之所过，血为凝滞，蓄结痈膜，吐如米粒，始萌可救，脓成则死。
肺症证口中辟辟燥，咳则胸中隐隐痛，脉反滑数或数实者，此为肺痈也。肺痈有脓血而呕
者，不须治，其呕脓止自愈。肺痈已破风入者，不治。肺痈不觉，但发寒热，咳亦微，须要按
其右胁而痛者是也。张子和治一小儿，久发寒热，咳亦微，骨蒸，治之半年，病甚。戴人诊之，
两手寸尺脉皆潮于关，关脉独大。戴人曰∶肺痈也，去儿衣，举其两手，按右胁，儿则避缩有
痛，按左胁则不避，故知有肺痈者，右胁必痛也。
肺部脉紧为肺瘫。寸口脉数而实者，为肺痈。寸口脉微而数，微则为风，数者为热。肺痈脉
紧数为脓未成，其脉紧去，但数，脓已成。肺痈病，身常有热，咳嗽短气，吐出脓血，其脉当短
涩而反浮大，其色当白而反赤者，此火之克金，大逆不治也。
巢元方说：肺痈，是由于风寒侵袭肺部，导致肺气结聚而形成的。肺主司气，外合皮毛。若因劳倦损伤气血，腠理（皮肤纹理及汗孔）开泄而感受邪气，气虚之人，邪气便乘虚侵袭肺部，寒邪与血相搏，蕴结而成痈肿，积热不散，败坏的血液化为脓液。患者出现咳嗽，胸部内部胀满，隐隐作痛且伴有战栗，咽喉干燥，口中感觉燥烈，但并不口渴，时常吐出浑浊且带有腥臭味的唾液，日久之后吐出如米粥般的脓液，这种情况难以治疗。又说道：风邪中伤卫分，呼气不能深入；风邪数犯营分，吸气不能外出。风邪损伤皮毛；热邪损伤血脉。风邪留舍于肺，患者就会呕吐，口干、气喘胸满，咽干但不渴，唾出浊沫，时常发冷战栗。热邪经过之处，血液凝滞，蓄积结聚成痈膜，吐出物如米粒，在疾病初起阶段尚可救治，一旦脓液形成则预后不良甚至死亡。
肺痈的症状表现为口中感觉燥烈，咳嗽时胸部隐隐作痛，脉象反而滑数或数实，这就是肺痈。肺痈已有脓血并伴有呕吐的，不需要特别治疗，待呕出的脓液停止后，疾病会自行痊愈。肺痈已经溃破又有风邪侵入的，属于不治之症。肺痈如果不明显，仅表现为发冷发热，咳嗽也很轻微，需要按压其右侧胁部感到疼痛的，就是肺痈。张子和曾治疗一名小儿，长期发作寒热，咳嗽轻微，伴有骨蒸潮热，治疗半年，病情加重。戴人（张子和号戴人）诊察发现，患儿两手寸部和尺部的脉搏都浮越于关部之上，唯独关脉盛大。戴人说：“这是肺痈。”让婴儿脱去衣服，举起他的双手，按压右侧胁部，婴儿则躲避退缩并表现出疼痛，按压左侧胁部则不躲避，因此知道有肺痈的患者，右侧胁部必定疼痛。
肺部脉象紧，提示为肺痿（注：原文“肺瘫”据语境及后世校勘多指肺痿或肺痈重症，此处依原文直译但需知其为病名）。寸口脉数而实的，是肺痈。寸口脉微而数，微脉代表风邪，数脉代表热邪。肺痈脉象紧数，说明脓液尚未形成；如果紧脉消失，仅见数脉，说明脓液已经形成。患肺痈病的人，身体常有发热，咳嗽、呼吸短促，吐出脓血，其脉象应当短涩却反而浮大，面色应当白却反而赤红，这是火克金的征象，属于大逆之证，难以治愈。
Chao Yuanfang stated: Fei Yong (Lung Abscess) is formed by wind-cold injuring the lung, causing the qi to knot and accumulate. The Lung governs qi and corresponds to the skin and hair. When labor and fatigue damage blood and qi, the couli (pores and interstices) open, allowing pathogens to invade. In individuals with qi deficiency, pathogens take advantage of the deficiency to injure the lung; cold condenses with blood, accumulating and forming an abscess. Accumulated heat does not dissipate, and damaged blood transforms into pus. The patient experiences cough, fullness in the chest, dull pain accompanied by shivering, dry throat, a sensation of dryness in the mouth without thirst, frequent expectoration of turbid, foul-smelling saliva, and eventually expectoration of pus resembling rice porridge; this condition is difficult to treat. It is also said that when wind attacks the Wei level, exhalation fails to enter deeply; when wind repeatedly invades the Ying level, inhalation fails to exit smoothly. Wind injures the skin and hair; heat injures the blood vessels. If wind lodges in the lung, the patient will vomit, experience dry mouth, wheezing, and chest fullness, dry throat without thirst, expectorate turbid foam, and suffer from frequent chills. Wherever heat passes, blood becomes stagnant, accumulating and forming an abscess membrane; the expectorant resembles rice grains. If treated at the initial stage, it can be saved; once pus is formed, death ensues.
Symptoms of Fei Yong include a dry sensation in the mouth, dull pain in the chest upon coughing, and a pulse that is slippery and rapid or rapid and excess; this indicates Fei Yong. In cases of Fei Yong where pus and blood are present accompanied by vomiting, no specific treatment is required; once the vomiting of pus ceases, the disease will heal spontaneously. If Fei Yong has ruptured and wind has invaded, it is incurable. If Fei Yong is not obvious, manifesting only as chills and fever with mild cough, one must press the right hypochondrium to check for pain; if painful, it is Fei Yong. Zhang Zihe treated a child who had suffered from recurrent chills and fever for a long time, with mild cough and bone-steaming tidal fever. After half a year of treatment, the condition worsened. Dai Ren (Zhang Zihe's courtesy name) diagnosed the pulse: the Cun and Chi positions on both hands were surging beyond the Guan position, while the Guan pulse alone was large. Dai Ren said, "This is Fei Yong." He asked the child to remove clothes, raised both hands, and pressed the right hypochondrium; the child avoided shrinking and showed pain. Pressing the left hypochondrium caused no avoidance. Thus, he knew that patients with Fei Yong would necessarily have pain in the right hypochondrium.
A tight pulse in the Lung region indicates Fei Wei (Lung Flaccidity). A rapid and excess pulse at the Cun Kou position indicates Fei Yong. A minute and rapid pulse at the Cun Kou position: minute indicates wind, rapid indicates heat. In Fei Yong, a tight and rapid pulse indicates that pus has not yet formed; if the tightness disappears and only rapidness remains, pus has already formed. Patients with Fei Yong disease often have body heat, cough, shortness of breath, and expectorate pus and blood. Their pulse should be short and choppy but is instead floating and large; their complexion should be white but is instead red. This represents Fire overcoming Metal, a great reversal indicating an incurable condition.