○一因病陟医，苦无统要入门，叔和《脉诀》、东垣《药性》、《编注病机》、《医方快捷方式》、《医学
权舆》，非不善也，然皆各自成帙，有所不便，《伤寒论》、《活人书》、《百问歌》，非不美也，然非幼
读不能成诵；《医经国小》法全辞略，真可以入门也，而《局方》又有所未备，且意太简古，学人亦难了悟。
是以少瘥，将前数书合并成帙，中分内外。内集详于运气、经络、针灸、脉、药，外集详于温暑、伤寒、内伤、
杂病、方论。医能知此内外门户，而后可以设法，治病不致徇象执方，夭枉人命，故题之曰《医学入门》。
○一阴骘，病家元气，医家本领。国朝为善阴骘，当时置一册座右，则意向自别。
○保养以助药力，若专恃药而不知养性，则药亦难效。古人皆先养性，不愈而后服药，故纂《素问》及丹
溪二说于前，而附以己意，断之于后。
○运气理微，一遵《素问》、《灵枢》及各名家要括。
○历代名医姓氏，上古者遵名医图及原医药性，俾人知所自而不忘其本也；汉唐以后名家纂《医林史传》、
《外传》而载其治验，俾人知所法也。
○经络，修明堂仰人伏人图歌，而注以《内经》。寸数穴法主治，与《铜人针灸经》及徐氏、庄氏皆同。
○脏腑遵《素》、《难》，兼采华佗《内照》、《编注药性》等书。
○灸必根据古，针学曾受五家手法，取其合于《素》、《难》及徐氏、何氏，录之以备急用。
○形色脉诀，遵《素》、《难》及《医经国小》、《脉经》、《脉图》、《权舆》、《脉诀》。
○本草用《医经国小》及《快捷方式》、《释药》、《集韵》，得《大观》旨也，更采《集要》等书，注其未
备。
○温暑全纂刘河间《原病式》。
○伤寒以陶氏《六书》为主，并入《伤寒论注》及《活人书》、《百问》、《百证》、王氏《家宝》、
《仁斋直指》等书，而其分段次序，用《活人赋》改补，拆为病机、用药二篇，则愚之管见也。后阅《溯洄集》
所论次序颇同，惜其未暇编耳。
○内伤纂东垣并各名家而编次之。
○杂病窃危氏《得效方》意，及丹溪用药总法，而提其风、寒，暑、湿、燥、火、气、血、痰、郁大纲
于前，稍从《丹溪附余》，小目分类于后。其歌括一以《快捷方式》、《权舆》为主而改补之，更用《玉机微义》、
《袖珍》、《仁斋直指》、万氏等方分注于下。
○女科以《妇人良方》为主及参名家。
○小儿以《仁斋》为主，并《安老怀幼》书，痘疹以《医学正传》为要，并《仁斋》、陈氏、魏氏、闻人氏
三要等书。
○外科以《外科枢要》为主。
○治法集古而去其重复耳。
○杂病用药赋及古方诗括，根据《仁
斋》、《快捷方式》而修补之。凡病机注下有方名而无药品，又不书见何门，必见伤寒杂病用药赋与古方诗括，或
本草注，目录可查。
○正方名，凡单方如抑青丸，则改为单黄连丸。二味者加一古字于上，所以遵神农也。三味者如三补丸，
改为黄连黄芩黄柏丸，若黄连为君，则先连次芩、柏，汤药亦然，所以效仲景也。又如四君子之类，加一二味便
易其名者，则去其新立名目，只云即四君子汤加某药。又有君臣佐使，以多者为君，合以君药立名，中间有以
臣药及佐使药立名者，悉易之。凡此皆厌方之太多而理益湮塞，又令人易记也。其间有二十四五味以上者，决不录
入，盖太杂太多，非神农本意。又下以药味为名者，下却更不载其药，如芎辛汤，白术甘草水煎，下更不载芎、
辛二药。
○歌括多有一句两读者，大字既可成句，又可接下小注成一句者，多是汤散名字。大字止载其名，汤散二
字注下，凡此皆省字故耳。虽然欲简省者，心也；不能省而简HT 八九帙者，学之无要而依样画成，聊为初学入
门。若大方专精，徒为嗤笑之资云。
○ Because of illness and seeking medical help, I suffered from the lack of a comprehensive yet accessible introductory text. He Shao's *Mai Jue* (Pulse Rhymes), Li Dongyuan's *Yao Xing* (Properties of Medicinals), *Bian Zhu Bing Ji* (Annotated Pathogenesis), *Yi Fang Kuai Jie Fang Shi* (Quick Reference for Medical Formulas), and *Yi Quan Yu* (Medical Origins) are not without merit; however, each exists as a separate volume, causing inconvenience. *Shang Han Lun* (Treatise on Cold Damage), *Huo Ren Shu* (Book that Saves People), and *Bai Wen Ge* (Song of Hundred Questions) are not without beauty; yet, they cannot be memorized unless studied from childhood. *Yi Jing Guo Xiao* (Small Book of Medical Classics) offers complete methods with concise language, truly suitable for beginners, but *Ju Fang* (Formulary of the Bureau of Pharmacy) has omissions, and its meaning is too archaic and simple, making it difficult for learners to comprehend. Therefore, upon recovering slightly, I merged the aforementioned books into one volume, divided internally into two sections: Internal and External. The Internal section details Yun Qi (Five Movements and Six Qi), meridians, acupuncture, pulse diagnosis, and materia medica. The External section details warm diseases, summerheat diseases, cold damage, internal injury, miscellaneous diseases, and formula discussions. Once physicians understand these internal and external frameworks, they can then formulate treatment strategies, avoiding rigid adherence to symptoms or formulas that might lead to premature death. Hence, the title *Yi Xue Ru Men* (Introduction to Medicine).
○ Yin Zhi (Secret Virtue/Accumulating Merit through Unseen Good Deeds) constitutes the vital energy (Yuan Qi) of the patient and the core competence of the physician. In our dynasty, promoting secret virtue was emphasized; keeping a book on this topic by one's writing desk would naturally refine one's intentions.
○ Physical maintenance aids medicinal efficacy. Relying solely on drugs without cultivating one's nature renders medicines less effective. Ancients prioritized nurturing their nature first, resorting to medication only if necessary. Thus, I compiled teachings from *Su Wen* (Basic Questions) and Zhu Danxi at the beginning, appended my own views, and concluded with judgments.
○ The principles of Yun Qi (Five Movements and Six Qi) are subtle; I strictly followed *Su Wen*, *Ling Shu* (Spiritual Pivot), and summaries from various masters.
○ Regarding surnames of famous doctors throughout history: for ancient times, I followed *Ming Yi Tu* (Illustrated List of Famous Physicians) and original materia medica texts, so people know their origins and do not forget their roots. For the Han and Tang dynasties onwards, I compiled *Yi Lin Shi Zhuan* (Biographies of Doctors in the Forest of Medicine) and *Wai Zhuan* (External Biographies) to record their successful treatments, so people know whom to emulate.
○ For meridians, I revised the songs for Ming Tang acupoints (anterior/posterior views) and annotated them with content from *Nei Jing* (Inner Canon). The cun measurements, point methods, and indications align with *Tong Ren Zhen Jiu Jing* (Bronze Man Acupuncture and Moxibustion Classic) and the works of Xu and Zhuang.
○ For zang-fu organs, I followed *Su Wen* and *Nan Jing* (Classic of Difficult Issues), incorporating Huatuo's *Nei Zhao* (Internal Reflection) and *Bian Zhu Yao Xing* (Annotated Properties of Medicinals).
○ Moxibustion strictly follows ancient texts. Acupuncture techniques were learned from five masters, selecting those consistent with *Su Wen*, *Nan Jing*, and the schools of Xu and He, recorded here for emergency use.
○ Observing complexion, form, and pulse rhymes follow *Su Wen*, *Nan Jing*, *Yi Jing Guo Xiao*, *Mai Jing* (Pulse Classic), *Mai Tu* (Pulse Diagrams), *Yi Quan Yu*, and *Mai Jue*.
○ Materia Medica utilizes *Yi Jing Guo Xiao*, *Yi Fang Kuai Jie Fang Shi*, *Shi Yao* (Explanation of Medicinals), and *Ji Yun* (Collected Rhymes), grasping the essence of *Da Guan Ben Cao* (Great View Materia Medica), while supplementing with *Ji Yao* (Essential Collection) and other texts to annotate deficiencies.
○ Warm and Summerheat diseases are entirely compiled from Liu Hejian's *Yuan Bing Shi* (Original Treatise on Disease Causes).
○ Cold damage primarily relies on Tao Hua's *Liu Shu* (Six Books), integrating *Shang Han Lun Zhu* (Annotation of Treatise on Cold Damage), *Huo Ren Shu*, *Bai Wen*, *Bai Zheng*, Wang Kentang's *Jia Bao*, and *Ren Zhai Zhi Zhi*, among others. The segmentation and order were modified using *Huo Ren Fu* (Ode to Saving People), splitting into two chapters: Pathogenesis and Medication. This is my humble opinion. Later, reading *Su Hui Ji* (Collection of Tracing Back), I found similar discussions on order, regretting that he did not have time to compile it.
○ Internal injuries are compiled from Li Dongyuan and various masters, arranged systematically.
○ Miscellaneous diseases borrow the intent from Wei Yilin's *De Xiao Fang* (Effective Formulas) and Zhu Danxi's general medication principles. I presented the main outlines of Wind, Cold, Summerheat, Dampness, Dryness, Fire, Qi, Blood, Phlegm, and Stagnation at the front, and classified sub-categories at the back, slightly referencing *Dan Xi Fu Yu*. The songs rely mainly on *Yi Fang Kuai Jie Fang Shi* and *Yi Quan Yu*, supplemented with annotations from *Yu Ji Wei Yi*, *Xiu Zhen Fang*, *Ren Zhai Zhi Zhi*, and Wan Mi's formulas.
○ Gynecology primarily uses *Fu Ren Liang Fang* (Good Formulas for Women), consulting various masters.
○ Pediatrics primarily uses *Ren Zhai* (referring to *Ren Zhai Zhi Zhi Xiao Er Fang Lun*), combined with *An Lao Huai You*. For smallpox and measles, *Yi Xue Zheng Zhuan* (Correct Transmission of Medicine) is essential, along with *Ren Zhai*, Chen, Wei, and Wenren's "Three Essentials."
○ Surgery primarily uses *Wai Ke Shu Yao* (Essentials of Surgery).
○ Treatment methods collect ancient practices, removing repetitions.
○ The ode on medication for miscellaneous diseases and poems summarizing ancient formulas are repaired based on *Ren Zhai* and *Yi Fang Kuai Jie Fang Shi*. If a pathogenesis note lists a formula name but no ingredients, nor indicates which section it belongs to, one must refer to the Ode on Medication for Cold Damage/Miscellaneous Diseases, Ancient Formula Poems, or Materia Medica notes; the index allows checking.
○ Regarding standard formula names: Single-ingredient formulas like *Yi Qing Wan* are renamed *Dan Huang Lian Wan* (Single Coptis Pill). Two-ingredient formulas add the character "Gu" (Ancient) at the beginning, respecting Shennong. Three-ingredient formulas like *San Bu Wan* are renamed *Huang Lian Huang Qin Huang Bai Wan* (Coptis, Scutellaria, Phellodendron Pill); if Coptis is the sovereign herb, it is listed first, followed by Scutellaria and Phellodendron. Decoctions follow the same rule, emulating Zhang Zhongjing. For formulas like *Si Jun Zi Tang* (Four Gentlemen Decoction), if one or two herbs are added, the new name is discarded, simply stating "Si Jun Zi Tang plus [Herb]." For formulas with Sovereign, Minister, Assistant, and Courier roles, the ingredient with the largest quantity is considered the Sovereign, and the name is derived from it. Any intermediate naming based on Ministers or Assistants/Couriers is changed. All these changes aim to reduce the proliferation of formula names, which obscures medical principles, and to aid memory. Formulas with more than twenty-four ingredients are excluded as they are too complex, contrary to Shennong's intent. Formulas named after ingredients (e.g., *Xiong Xin Tang*) where the ingredients are not listed below (e.g., cooked with Atractylodes and Licorice, excluding Ligusticum and Asarum) are handled specifically.
○ Songs often contain lines read in two ways: large characters forming a line, or continuing into small notes to form a line, usually indicating decoction or powder names. Large characters list only the name, with "Decoction/Powder" noted below, saving space. While the desire for brevity is good, reducing extensive volumes to eight or nine fascicles due to a lack of essential learning principles results in mere imitation. This serves merely as an introduction for beginners. For specialized, grand works, such simplification would only invite ridicule.