夫肺与大肠为表里，肛者大肠之门也。肺实则温，温则内气充而有所蓄，虚则寒，
寒则内气馁而不能收，是以肠头出露矣。多得于大痢不止，里急后重，努力肛开，外风
所吹而致者，或伏暑暴注，洞泻肠头不禁者，或禀赋怯弱，易于感冷，啼叫努气，大
肠虚脱者，盖泻痢未有不因风暑湿热伤脾，脾虚则肺气既弱，大肠亦虚，土为金母，母
虚不能生金，是以少被风冷，则肠头即为虚脱。治宜补脾温胃，使金受母之益而上升，
次投固肠之剂，外用熏掺等方，若久出而坚者，先以温暖药汤烧软，渐渐纳入，若肠头
作痒者，多因大肠湿热生虫而蚀肛门，上唇有疮，虫蚀其脏，下唇有疮，虫蚀其肛，久
则齿根无色，舌上尽白，四肢倦怠，唾血如粟，心内懊 ，而为危症，初治宜服化
丸，外用生艾，用楝根煎汤熏洗，至若蚀肛透内者不治。
肛门为大肠之使，大肠受热受寒，皆能脱肛。且大肠者传导之官，肾者作强之官，
酒色过度，则肾虚而盗泄母气，肺因以虚，大肠气无所主，故令脱肛，小儿血气未壮，
老人血气已衰，皆有此症。又按，丹溪所论，脱肛因气虚血虚者固多，亦有因气热血
热者，宜兼脉候详察。气虚者补气，参 术草制升麻之类；血虚者四物汤；血热者凉血
四物汤，加炒柏；气热者条芩升麻之类，并宜升提。
谷道痒痛，多因湿热生虫，欲成痔 ，宜以雄黄和艾烧烟熏之，或用桃叶一斛蒸之
极热，纳小口瓶中，坐熏立死。
肺与大肠互为表里，肛门是大肠的门户。肺气充实则温暖，温暖则体内正气充盈而有蓄积；肺气虚弱则寒冷，寒冷则体内正气气馁而不能固摄，因此直肠脱出。这种情况多因长期痢疾不止，出现里急后重（腹痛窘迫，时时欲便，肛门重坠），用力努挣导致肛门张开，或因外感风邪吹袭所致；或因伏暑引起的急性暴泻，大便如水注下，直肠无法控制而脱出；或因先天禀赋怯弱，容易感受寒冷，啼哭呼叫时用力努气，导致大肠虚脱。大概腹泻和痢疾没有不是因为风、暑、湿、热损伤脾脏，脾虚则肺气既已衰弱，大肠也随之虚弱。土为金之母（脾属土，肺属金），母脏虚弱不能滋养子脏，因此稍微受到风冷侵袭，就会导致直肠虚脱。治疗应当补脾温胃，使肺金受到母脏的益处而上升，其次投用固涩肠道的药剂，外用熏蒸和掺药等方剂。如果直肠脱出时间久且质地坚硬，先用温热药汤将其烧软，再慢慢纳入复位。如果直肠脱出部分发痒，多因大肠湿热生虫侵蚀肛门，若上唇有疮，说明虫蚀内脏；若下唇有疮，说明虫蚀肛门。时间久了会出现牙根颜色消失，舌面全白，四肢倦怠，咳吐如粟米状的血液，心中烦闷懊恼，成为危重病症。初期治疗宜服用化虫丸，外用生艾草，用苦楝树根煎汤熏洗。至于虫蚀肛门并穿透内部的，属于不治之症。
肛门是大肠的使者，大肠受热或受寒，都能导致脱肛。而且大肠是传导糟粕的器官，肾是作强（精力充沛）的器官，酒色过度会导致肾虚并盗泄母气（肾为肝之母，此处指肝肾同源或精气亏损影响整体），肺因此虚弱，大肠之气无所主司，所以导致脱肛。小儿气血尚未强壮，老人气血已经衰退，都可能出现这种症状。另外据丹溪论述，脱肛因气虚和血虚导致的固然很多，也有因气分和血分有热的，应当结合脉象详细诊察。气虚的用补气法，如人参、白术、甘草配合制升麻之类；血虚的用四物汤；血热的用凉血四物汤，加炒黄柏；气热的用条芩（黄芩）、升麻之类，并且都适宜使用升提之法。
谷道（肛门）瘙痒疼痛，多因湿热生虫，想要形成痔疮，宜用雄黄混合艾草燃烧烟雾熏烤，或者用桃叶一斛（极大量）蒸煮至极热，放入小口瓶中，坐在瓶口熏蒸，可立即治愈。
The Lung and Large Intestine are exteriorly-interiorly related, and the anus is the gate of the Large Intestine. When Lung Qi is full, it is warm; warmth implies that internal vital energy is abundant and stored. When Lung Qi is deficient, it is cold; coldness implies that internal vital energy is discouraged and unable to retain, thus causing the rectum to prolapse. This condition often results from persistent dysentery with tenesmus (urgent need to defecate with a feeling of incomplete evacuation), straining efforts opening the anus, and exposure to external wind pathogens. It may also result from acute sudden diarrhea caused by latent summerheat, where the rectum cannot be controlled due to profuse watery stools. Alternatively, it may stem from congenital weakness, susceptibility to cold, and straining during crying or shouting, leading to deficiency-collapse of the Large Intestine. Generally, diarrhea and dysentery arise from wind, summerheat, dampness, and heat damaging the Spleen. Spleen deficiency leads to weakened Lung Qi and subsequently a deficient Large Intestine. Since Earth generates Metal (Spleen is Earth, Lung is Metal), maternal deficiency fails to nourish the child organ; thus, even slight exposure to wind-cold can cause rectal prolapse due to deficiency. Treatment should focus on tonifying the Spleen and warming the Stomach, allowing Lung Metal to benefit from its mother and ascend. Subsequently, administer intestinal-astringent formulas. Externally, use fumigation and powder application methods. If the prolapsed rectum has been out for a long time and becomes hard, first soften it with warm medicinal decoctions, then gradually reduce it. If the prolapsed tissue itches, it is mostly due to parasites generated by damp-heat in the Large Intestine eroding the anus. Ulcers on the upper lip indicate parasites eroding the viscera; ulcers on the lower lip indicate parasites eroding the anus. In chronic cases, gum roots lose color, the tongue becomes entirely white, limbs feel fatigued, hemoptysis resembles millet grains, and the patient experiences mental restlessness and vexation, constituting a critical condition. Initial treatment involves administering Huachuan Wan (Parasite-Dissolving Pill) externally using raw Mugwort, fumigating and washing with decoction of Melia Toosendan Root. Cases where parasites erode through the anus internally are incurable.
The anus serves as the envoy of the Large Intestine. Whether the Large Intestine is affected by heat or cold, both can lead to rectal prolapse. The Large Intestine is the official responsible for conduction, while the Kidney is the official responsible for strength and vigor. Excessive indulgence in alcohol and sexual activity leads to Kidney deficiency, which drains maternal qi (referring to the depletion of foundational essence affecting the whole system). Consequently, the Lung becomes deficient, and the Qi of the Large Intestine lacks mastery, resulting in prolapse. Children whose blood and qi are not yet robust, and the elderly whose blood and qi have declined, are both susceptible to this condition. Furthermore, according to Danxi's discussion, rectal prolapse is indeed common due to Qi deficiency and Blood deficiency, but there are also cases caused by Qi heat and Blood heat. These must be carefully examined via pulse diagnosis. For Qi deficiency, employ Qi-tonifying methods such as Ginseng, Atractylodes Macrocephala Rhizome, Licorice Root, combined with prepared Cimicifuga Rhizome for lifting. For Blood deficiency, use Siwu Tang (Four Substance Decoction). For Blood heat, use Liangxue Siwu Tang (Cooling Blood Four Substance Decoction) with fried Phellodendron Bark. For Qi heat, use Scutellaria Baicalensis Root and Cimicifuga Rhizome, all suitable for lifting therapies.
Anal itching and pain are mostly caused by parasites generated from damp-heat, potentially developing into hemorrhoids. One may mix Realgar with Mugwort and burn them to smoke-fumigate the area. Alternatively, steam one hu (a large ancient unit of volume) of Peach Leaves until extremely hot, place them in a small-mouthed bottle, and sit over the bottle to fumigate, which can cure the condition immediately.