全身发热且烫手，喜欢偏向右侧睡眠而不能左侧卧，若左侧卧则呼吸急促、心中不安，咳出的痰液像脓血一样腥臭，用水验证时，痰液下沉而不漂浮，脉象数而有力，这称为肺痈。这是由于劳损伤及气血，腠理（皮肤毛孔）开放而受邪气侵袭，寒邪与血液搏结，蕴积结成痈肿，积热不散，败坏的血液化为脓液，咳嗽损伤肺叶所致，按压其右胁部必然疼痛的就是此病。如果痈肿已经破溃并侵入风邪的，属于不治之症。吐出脓液像米粥一样的，难以治疗。然而肺痿是由于正气虚弱，肺痈则是邪气实盛，治疗肺痿的方法，在于养血益气、养神清金（清肃肺气）；而治疗肺痈，在于补养气血并兼用排脓之法。然而肺痿也有属寒证的，必定出现头晕目眩、吐涎沫且不咳嗽，口不渴且遗尿，这是肺中寒冷而心下有湿液停留的表现。古人使用炙甘草、干姜来治疗它，以补益虚劳。
The whole body feels hot and scorching to the touch. The patient prefers sleeping on the right side and cannot lie on the left; lying on the left causes rapid breathing and restlessness. The expectorated sputum resembles purulent blood with a foul, fishy odor. When tested with water, it sinks rather than floats. The pulse is rapid and forceful. This condition is named Fei Yong (Lung Abscess). It arises from labor-induced injury to Qi and Blood, causing the Cou Li (skin and pores) to open and become susceptible to pathogenic factors. Cold pathogens contend with Blood, accumulating to form an abscess. Accumulated heat fails to dissipate, corrupting Blood into pus, and coughing damages the lung tissue, resulting in pain upon palpation of the right hypochondrium. If the abscess has ruptured and wind pathogens have invaded, it is incurable. If the expectorated pus resembles congee (rice porridge), it is difficult to treat. However, Fei Wei (Lung Flaccidity) is characterized by deficiency of Righteous Qi, whereas Fei Yong is characterized by excess of Pathogenic Factors. The treatment principle for Fei Wei lies in nourishing Blood and Qi, calming the Spirit, and clearing Metal (clearing Lung heat/dryness); while the treatment for Fei Yong lies in tonifying Qi and Blood combined with draining pus. Nevertheless, Fei Wei can also present with cold syndromes, manifesting as dizziness, expectoration of saliva and foam without coughing, absence of thirst, and urinary incontinence. This indicates cold in the Lung and damp-fluid retention in the Heart region. Ancient practitioners used Zhi Gan Cao (Honey-fried Licorice Root) and Gan Jiang (Dried Ginger) to treat this, aiming to tonify deficiency and exhaustion.