诸患易识，独肺中患毒难觉。有两脚骨疼痛者，有脚骨不痛而舌下生一粒如细豆者，再
心口
之上，内作微痛，及咳嗽、口干、咽燥，此皆肺中生毒之证也。即用甘、桔各三钱煎服。服
下如觉稍安，肺之患毒无疑矣。以犀黄丸十服，服完痊愈。此是预识预治，百无一死之法。
世人但知脚痛医脚，咳嗽医嗽，舌下一粒，便以刀刺。且此一粒，患未成脓，定然色淡，患
愈亦消，患笃其色紫黑，如用刀刺立害。诸书皆载云∶口吐臭痰，胸中发腥作痛者，肺痈也
。又称症有三不治∶时吐臭痰，久如粳米饭者不治；呕脓不止者不治；白面变赤者不治。惟
呕而脓自出者易治。治之之药，惟地黄、保生、归脾等汤轮服而已，并无预知早治之法。直
至吐臭痰发腥，始知肺痈，犹小舟飘入大洋也。此等立论，安可为后学津梁？余每见此症吐
脓，其色皆白，故称肺痈。用犀黄丸，治无不效。有赤贫者患之，以陈芥菜卤，每晨取半杯
，滚豆腐浆冲服。服则胸中一块，塞上塞下，塞至数次，方能吐出，连吐恶脓，日服至愈。
凡患此症者，终身戒食鸭蛋、白鲞、红萝卜、石首鱼、着甲鱼，食则复发难生。
马曰∶肺疽、肺痈，均由咳嗽而起，或外感风寒，郁久化热，或心肝之火上炎，肺叶胀
举而
成痈脓，故胸痛咳嗽，吐脓吐血。火刑金之候，岂可以乳、没辛苦温之品，助其热，伤其肺
？麝香走窜，盗泄真气，《本草》均称诸疮痈疽，溃后勿服，何况娇脏受病乎？
各种病症容易识别，唯独肺中患毒难以察觉。有的患者双脚骨疼痛，有的脚骨不痛但舌下长出一粒像细豆大小的东西，再往上到心口之上，内部感到轻微疼痛，以及咳嗽、口干、咽燥，这些都是肺中生毒的证候。此时应立即用甘草、桔梗各三钱煎服。服药后如果感觉稍有好转，则肺中患毒无疑。服用犀黄丸十剂，服完后痊愈。这是预先识别并预先治疗的方法，是百无一失的保命之法。世人只知道脚痛治脚，咳嗽治咳，看到舌下一粒，就用刀刺破。况且这一粒，脓尚未形成，颜色定然淡白，病愈后也会消退，若病情严重则颜色变为紫黑，如果用刀刺破会立即造成危害。各类医书都记载说：口吐臭痰，胸中发腥作痛的，是肺痈。又指出有三种症状是不治之症：时常吐出臭痰，久咳如粳米饭状者不治；呕出脓液不止者不治；面色由白变红者不治。只有呕吐而脓液自然排出的容易治疗。治疗此病的药物，只有地黄汤、保生汤、归脾汤等轮流服用而已，并没有预先知晓及早治疗的方法。直到吐出臭痰、散发腥味时，才知道是肺痈，这就如同小舟飘入大洋一样（无法挽回）。这种立论，怎么可以作为后学的指引呢？我每次见到这种病症吐出的脓，颜色都是白色的，所以称之为肺痈。使用犀黄丸，治疗没有不有效的。有极度贫穷的人患上此病，用陈年的芥菜卤，每早晨取半杯，用滚开的豆腐浆冲服。服用后胸中有一块异物感，上下堵塞，塞至数次，方能吐出，连续吐出恶臭脓液，每日服用直至痊愈。凡是患有此症的人，终身禁止食用鸭蛋、白鲞（咸鱼）、红萝卜、石首鱼、甲鱼，吃了就会复发且难以救治。
马曰：肺疽和肺痈，都是由咳嗽引起的，或者是外感风寒，郁积日久化热，或者是心肝之火上炎，导致肺叶肿胀举起而成痈脓，所以出现胸痛咳嗽，吐脓吐血。这是火克金的症状，怎么能用乳香、没药这样辛苦温热的药物，来助长其热邪，损伤其肺脏呢？麝香走窜，盗泄真气，《本草》均称各种疮疡痈疽，溃破后不要服用，何况是娇嫩的脏腑生病呢？
Various ailments are easy to identify, but only the toxicity in the lungs is difficult to perceive. Some patients experience pain in the bones of both feet; others have no foot bone pain but develop a small lump under the tongue, resembling a fine bean. Additionally, there is slight internal pain above the heart region (Xinkou), accompanied by cough, dry mouth, and dry throat. These are all signs of toxicity developing in the lungs. At this stage, one should immediately decoct and administer three qian each of Gancao (Licorice Root) and Jiegeng (Platycodon Root). If the patient feels slightly relieved after taking the medicine, it is undoubtedly lung toxicity. Administering ten doses of Xihuang Wan (Calculus Bovis Pill) will lead to recovery upon completion. This method of early identification and early treatment is a strategy with virtually no mortality. People generally know to treat foot pain by treating the foot, and cough by treating the cough; seeing a lump under the tongue, they pierce it with a knife. However, this lump has not yet formed pus, so its color is naturally pale, and it will disappear when the disease heals. If the condition becomes severe, the color turns purple-black, and piercing it with a knife would cause immediate harm. Various medical texts record that spitting out foul-smelling sputum and experiencing a fishy sensation with pain in the chest indicates Feiyong (Lung Abscess). They also state that there are three types of symptoms that are incurable: frequent spitting of foul sputum lasting long enough to resemble cooked rice grains; continuous vomiting of pus; and complexion changing from white to red. Only cases where vomiting occurs with natural discharge of pus are easy to treat. The medications for treating this condition are limited to alternating doses of Dihuang Tang (Rehmannia Decoction), Baosheng Tang (Life-Preserving Decoction), and Guipi Tang (Restore the Spleen Decoction), with no method for early prediction or treatment. It is only until foul sputum is spat out and a fishy odor is detected that Lung Abscess is diagnosed, which is like a small boat drifting into the vast ocean (irretrievable). How can such arguments serve as a guide for future learners? Every time I observe this condition, the vomited pus is white, hence I call it Lung Abscess. Using Xihuang Wan yields effective results in every case. A destitute person suffering from this used aged mustard brine, taking half a cup each morning, mixed with boiling tofu milk. After ingestion, a sensation of blockage appears in the chest, moving up and down; after several times of this blockage, the material can be expelled, continuously vomiting foul pus. Daily administration continues until recovery. Patients with this condition must strictly avoid eating duck eggs, dried salted fish (Baixiang), carrots, hairtail fish (Shishouyu), and soft-shell turtles for life; consuming these will cause recurrence and make the condition difficult to save.
Ma said: Both Feiju (Lung Ulcer) and Feiyong (Lung Abscess) arise from coughing. They may result from external contraction of wind-cold, which stagnates and transforms into heat over time, or from the flaming upward of Heart and Liver fire, causing the lung lobes to swell and rise, forming abscesses and pus. Consequently, chest pain and coughing occur, along with spitting of pus and blood. This is a manifestation of Fire punishing Metal. How can one use aromatic, bitter, pungent, and warm substances like Rushxiang (Frankincense) and Moyao (Myrrh) to assist the heat and damage the lungs? Shexiang (Musk) moves and circulates, stealing and leaking true Qi. Bencao (Compendium of Materia Medica) states that for various sores and ulcers, Musk should not be taken after ulceration. How much more so when a delicate organ like the lung is diseased?