肺为华盖。表里大肠。大肠有户。肛门是张。肛即肠头。本属五内。其气通流。来往输将。肺如
实热。肠结非常。肺如虚寒。肠出而长。虚寒实热。此其大纲。致脱之故。还宜细详。风木克土。脾
胃是伤。暑湿风热。俱聚其方。清浊既混。洞泄莫当。久则肠虚。传送力 。风冷所袭。肛脱为殃。
他如久痢。努力是妨。禀赋怯弱。神气 。皆能致脱。病非孔臧。又有肛痒。甘肥过尝。致生湿
热。壅滞非良。湿热成毒。虫生蚀肛。其肛作痒。肠吊心忙。便血发热。神志凄惶。肌体骨立。遍身
生疮。清胃涤热。扶脾是襄。内外兼治。乃其要方。蚀肛透内。此子必殇。
巢元方曰。肺与大肠为表里。肛者。大肠之门。肺实热。则闭结不通。肺虚寒。则肠头出露。有
因痢久里急后重。努力肛开。为外风所吹。或伏暑作泻。肠滑不禁。或禀气怯弱。易于感冷。亦致
大肠虚脱。凡小儿所患泻痢。皆因暑湿风热。乘脾胃虚而得。治法宜补脾温胃。使金得受母之益
而气实。宜藿香饮。次则内投固肠之剂。健脾饮、养脏汤。外以伏龙肝散敷之。令其自收。
陈藏器曰。小儿肛痒。或嗜甘肥。大肠湿热壅滞。或湿毒生虫而蚀肛门。若因湿热壅滞。宜四
味肥儿丸。大便秘者。清凉饮。虫蚀肛门。先用化 丸。后用四味肥儿丸。外以雄黄散纳肛门。若
因病不食。虫无所养。而食脏食肛者。其齿龈无色。舌上尽白。四肢倦怠。其上唇内有疮。吐血如
粟。心中懊 。此虫在上食脏。若下唇有疮。此虫在下食肛。若食肛透内者不治。
肺位于胸腔最高处，如同华盖一般覆盖其他脏腑。肺与大肠互为表里关系。大肠下端有门户，肛门即是这个门户的开口。肛门实际上是肠道的末端，原本属于五脏六腑的一部分。其气机通畅流转，往来输送。如果肺中有实热，肠道就会结滞不通；如果肺中有虚寒，直肠就会脱出且较长。无论是虚寒还是实热，这是导致脱肛的大致纲领。至于具体导致脱肛的原因，还需要仔细详察。风邪克伐脾土，损伤脾胃；暑湿、风热等邪气聚集于此。清浊之气混杂，导致严重的腹泻。时间久了，肠道虚弱，传导无力，再受风寒侵袭，就会导致肛门脱垂。此外，久患痢疾，用力排便也会妨碍肛门正常闭合。先天禀赋怯弱，神气不足，都能导致脱肛。病情并非仅仅局限于肛门局部，还有肛门瘙痒的情况。这是因为过食甘甜肥腻食物，导致湿热内生，壅滞不畅，这不是好现象。湿热蕴结成毒，生出虫蚀咬肛门，导致肛门瘙痒，甚至牵连心脏感到心慌不安。伴有便血、发热，神情凄惨惶恐，身体消瘦如柴，全身生疮。治疗应以清胃涤除热邪、扶持脾气为主。内外兼治，才是关键的方法。如果虫蚀肛门并穿透内脏，这个孩子必定夭折。
巢元方说：肺与大肠互为表里，肛门是大肠的门户。肺有实热，则大便闭结不通；肺有虚寒，则直肠头端脱出外露。有的因为长期患痢疾，腹部急迫、肛门重坠，用力努挣导致肛门张开，被外风吹袭；或者因伏暑引起腹泻，肠道滑脱不能固摄；或者因先天禀气怯弱，容易感受寒冷，也导致大肠虚脱。凡是小儿所患的泻痢，都是因为暑湿风热之邪，乘脾胃虚弱而致病。治疗方法应当补脾温胃，使肺金得到母脏（脾土）的滋养而气机充实。适宜使用藿香饮。其次是内服固肠的药物，如健脾饮、养脏汤。外用伏龙肝散敷贴，使其自行回纳。
陈藏器说：小儿肛门瘙痒，有的是因为嗜吃甘甜肥腻食物，导致大肠湿热壅滞；或者是湿毒生虫侵蚀肛门。如果是因湿热壅滞，适宜使用四味肥儿丸。大便秘结的，使用清凉饮。虫蚀肛门的，先用化虫丸，后用四味肥儿丸。外用雄黄散纳入肛门。如果因病不进食，虫无所养，转而吃内脏或啃食肛门，此时牙龈颜色淡白无血色，舌苔满布白色，四肢倦怠无力，上唇内侧有疮疡，吐血如粟米状，心中烦闷懊恼。这是虫在上部吃内脏的表现。如果下唇有疮，这是虫在下部吃肛门的表現。如果虫蚀肛门并穿透内脏，则无法治愈。
The Lung is the "Canopy" (Hua Gai), covering the other organs. It has a exterior-interior relationship with the Large Intestine. The Large Intestine has an exit, and the anus is this opening. The anus is essentially the end of the intestine, belonging to the internal organs. Its Qi flows freely, circulating and transporting. If the Lung has Excess Heat (Shi Re), the intestines become constipated; if the Lung has Deficiency Cold (Xu Han), the rectum prolapses and appears elongated. Whether Deficiency Cold or Excess Heat, these are the general principles. The causes of prolapse should be examined in detail. Wind Wood overacting on Earth damages the Spleen and Stomach. Summer-heat, Dampness, Wind, and Heat gather there. When Clear and Turbid Qi mix, severe diarrhea ensues. Over time, the intestines become deficient, lacking strength for transportation. Attacked by Wind-Cold, anal prolapse occurs. Furthermore, chronic dysentery and straining hinder normal closure. Congenital weakness and insufficient Shen-Qi can also cause prolapse. The disease is not confined to the anus; there is also anal pruritus. This results from excessive consumption of sweet and fatty foods, generating Damp-Heat that stagnates, which is unfavorable. Damp-Heat transforms into toxicity, producing parasites that erode the anus, causing itching and even palpitations. Accompanied by bloody stools and fever, the patient feels distressed and panicked, emaciated with sores all over the body. Treatment should focus on clearing the Stomach and eliminating Heat, while supporting the Spleen. Internal and external treatment combined is the key method. If parasites erode the anus and penetrate internally, the child will surely die young.
Chao Yuanfang stated: The Lung and Large Intestine are exterior-interior pairs; the anus is the gate of the Large Intestine. Lung Excess Heat leads to constipation and blockage; Lung Deficiency Cold leads to the protrusion of the rectal tip. Some cases arise from chronic dysentery with abdominal urgency and tenesmus, where straining opens the anus, allowing external Wind to blow in. Or, latent summer-heat causes diarrhea with intestinal slipping and incontinence. Or, congenital weak constitution makes one susceptible to Cold, leading to Large Intestine deficiency and prolapse. All pediatric diarrhea and dysentery result from Summer-heat, Dampness, Wind, and Heat pathogens taking advantage of Spleen-Stomach deficiency. The treatment method should tonify the Spleen and warm the Stomach, allowing Metal (Lung) to receive benefit from its Mother (Earth/Spleen), thereby strengthening Qi. Huoxiang Yin (Agastache Decoction) is suitable. Next, administer internal agents to secure the intestines, such as Jianpi Yin (Spleen-Tonifying Decoction) and Yangzang Tang (Nourishing Viscera Decoction). Externally, apply Fulonggan San (Dragon's House Soil Powder) to facilitate natural retraction.
Chen Cangqi stated: Pediatric anal pruritus may result from indulging in sweet and fatty foods, causing Damp-Heat stagnation in the Large Intestine, or damp-toxicity generating parasites that erode the anus. If due to Damp-Heat stagnation, Siwei Fei'er Wan (Four-Ingredient Child-Nourishing Pill) is suitable. For constipation, Qingliang Yin (Cooling and Clearing Decoction) is used. For parasitic erosion of the anus, use Huachong Wan (Parasite-Dissolving Pill) first, followed by Siwei Fei'er Wan. Externally, insert Xionghuang San (Realgar Powder) into the anus. If the illness prevents eating, parasites starve and turn to consuming viscera or biting the anus. In this case, the gums are colorless, the tongue is entirely white, limbs are fatigued, ulcers appear inside the upper lip, and hematemesis resembles millet grains, accompanied by mental restlessness. This indicates parasites feeding on viscera above. If ulcers appear on the lower lip, it indicates parasites feeding on the anus below. If parasitic erosion penetrates internally, it is incurable.