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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.