黄帝曰∶夫自古通天者生之本，本于阴阳。天地之间，六合之内，其气九州九窍、五脏、十二节，皆通
乎天气。其生五，其气三，数犯此者，则邪气伤人，
此寿命之本也。苍天之气，清净则志意治，顺之则阳气固，虽有贼邪，弗能害也，此因时之序。故圣人传精神，
服天气，而通神明。失之则内闭九窍，外壅肌肉，卫气散解，此谓自伤，气之削也。阳气者若天与日，失其所
则折寿而不彰，故天运当以日光
明。是故阳因而上，卫外者也。因于寒，欲如运枢，起居如惊，神气乃浮。因于暑，汗，烦则喘喝，静则多言，
体若燔炭，汗出而散。因于湿，首如裹，湿热不攘，大筋 短，小筋弛长， 短为拘，弛长为痿。因于气，为
肿，四维相代，阳气乃竭。阳气者，烦劳则张，精绝辟积，于夏使人煎厥。目盲不可以视，耳
闭不可以听，溃溃乎若坏都，汨汨乎不可止。阳气者，大怒则形气绝，而血菀于上，使人薄厥。有伤于筋，纵，
其若不容，汗出偏沮，使人偏枯。汗出见湿，乃生痤痱。高粱之变，足生大丁，受如持虚。劳汗当风，寒薄
为，郁乃痤。阳气者，精则养神，
柔则养筋。开阖不得，寒气从之，乃生大偻。陷脉为 ，留连肉腠。俞气化薄，传为善畏，及为惊骇。营气
不从，逆于肉理，乃生痈肿。魄汗未尽，形弱而气烁，穴俞以闭，发为风疟。故风者，百病之始也，清静则肉
腠闭拒，虽有大风苛毒，弗之能害，此因时之序也。故病久则传化，上下不并，良医弗为。故阳
蓄积病死，而阳气当隔，隔者当泻，不亟正治，粗乃败之。故阳气者，一日而主外，平旦人气生，日中而阳气
隆，日西而阳气已虚，气门乃闭。是故暮而收拒，无扰筋骨，无见雾露，反此三时，形乃困薄。
岐伯曰∶阴者，藏精而起亟也；阳者，卫外而为固也。阴不胜其阳，则脉流薄疾，并乃狂。阳不胜
其阴，则五脏气争，九窍不通。是以圣人陈阴阳，筋脉和同，骨髓坚固，气血皆从。如是则内外调和，邪不能
害，耳目聪明，气立如故。风客淫气，精乃亡，邪伤肝也。因而饱食，筋脉横解，肠 为痔。因而大饮，则
气逆。因而强力，肾气乃伤，高骨乃坏。凡阴阳之要，阳密乃固。两者不和，若春无秋，若冬
无夏，因而和之，是谓圣度。故阳强不能密，阴气乃绝，阴平阳秘，精神乃治，阴阳离决，精气乃绝，因于露
风，乃生寒热。是以春伤于风，邪气留连，乃为洞泄。夏伤于暑，秋为 疟。秋伤于湿，上逆而咳，发为痿厥。
冬伤于寒，春必温病。四时之气，更伤五脏。阴之所生，本在五味，阴之五宫，
伤在五味。是故味过于酸，肝气以津，脾气乃绝。味过于咸，大骨气劳，短肌，心气抑。味过于甘，心气喘满，
色黑，肾气不衡。味过于苦，脾气不濡，胃气乃浓。味过于辛，筋脉沮弛，精神乃央。是故谨和五味，骨正筋
柔，气血以流，腠理以密，如是则骨气以精，谨道如法，长有天命。
黄帝说：自古以来，人与自然界相通是生命的根本，而这一根本源于阴阳。天地之间，六合之内，其气与九州、九窍、五脏、十二关节相通，都贯通于天气。生命活动基于五行，气化运动分为三才（天、地、人），如果多次触犯这些规律，邪气就会伤害人体，这是寿命的根本所在。
苍天之气，清净平和则人的意志安定，顺应它则阳气固密，即使有贼邪侵害，也不能造成伤害，这是因为遵循了四时顺序。所以圣人保养精神，服纳天气，从而通达神明。如果不顺应，就会导致内部九窍闭塞，外部肌肉壅滞，卫气散漫解体，这叫做自我伤害，导致正气削弱。
阳气就像天空和太阳一样，如果失去其正常位置，就会折损寿命而不显赫，所以天的运行应当依靠日光来照明。因此，阳气位于上部，主要功能是护卫体表。如果受寒邪侵袭，阳气应像门轴一样灵活运转；如果起居惊扰不安，神气就会浮越。如果受暑邪侵袭，就会出汗，心烦则气喘喝叫，安静则多语，身体像燃烧的炭火一样热，出汗后热势消散。如果受湿邪侵袭，头部感觉像被包裹一样沉重；如果湿热不除，大筋会缩短，小筋会弛长，缩短会导致拘挛，弛长会导致痿证。如果受风气侵袭，会发生肿胀，四维之气交替受损，阳气就会衰竭。
阳气在烦劳过度时会亢张，精气耗竭且反复积累，到了夏天就会使人发生煎厥。表现为两眼失明不能视物，两耳闭塞不能听声，病情危急如同堤坝崩溃，洪流滚滚不可止住。阳气在大怒时会使得形体之气隔绝，血液郁积于上部，使人发生薄厥。如果损伤了筋脉，筋脉松弛，肢体不能随意运动，半身出汗，使人发生偏枯。出汗时遇到湿气，就会生痤痱。饮食过于肥甘厚味，足以引起大的疔疮，邪气侵入就像拿着空容器接受东西一样容易。劳累出汗时当风，寒气迫近皮肤成为皶，郁结则成为痤。
阳气精微部分能滋养精神，柔和部分能滋养筋脉。如果开阖功能失常，寒气随之侵入，就会发生大偻（脊柱弯曲）。寒气陷入经脉，留连于肌肉腠理之间。腧穴之气化薄，传变为易惊恐，以及惊骇。营气不顺，逆乱于肌肉纹理之间，就会发生痈肿。魄汗未尽，形体虚弱而气被消烁，穴俞闭塞，发作为风疟。所以风邪是百病的开端，如果内心清静，则肉腠闭合拒邪，即使有大风苛毒，也不能伤害人体，这也是顺应四时顺序的结果。所以病久就会传变，上下气机不通，即使是良医也难以治疗。所以阳气蓄积致死，是因为阳气阻隔，阻隔的应当用泻法，如果不及时正确治疗，粗疏的医生就会使其败坏。
阳气在一日之中主司体表，平旦时人气生发，日中时阳气最隆盛，日西时阳气已虚，气门（汗孔）关闭。所以傍晚时要收敛拒邪，不要扰动筋骨，不要接触雾露，违背这三个时辰的规律，形体就会困乏薄弱。
岐伯说：阴的功能是藏精并不断起而供养阳；阳的功能是护卫体表并保持固密。阴不胜阳，则血脉流动急迫，进而发展为狂症。阳不胜阴，则五脏之气争乱，九窍不通。所以圣人调和阴阳，使筋脉和谐，骨髓坚固，气血顺从。这样内外调和，邪气不能伤害，耳目聪明，气机正常运行。风邪客居体内扰乱气机，精气就会亡失，邪气伤害肝脏。如果饱食之后，筋脉松弛横解，肠道瘀滞形成痔疮。如果大量饮水，则气机上逆。如果强力房事，肾气就会受伤，高骨（脊椎）就会损坏。
大凡阴阳的关键，在于阳气致密则阴气固守。两者不和，就像春天没有秋天，冬天没有夏天一样。顺应这种规律加以调和，就称为圣人的法度。所以阳气过强而不能致密，阴气就会枯竭；阴气和平，阳气固秘，精神就能正常；如果阴阳离决，精气就会断绝。因为暴露于风中，就会发生寒热病。所以春天伤于风邪，邪气留连不去，就会发生洞泄（严重腹泻）。夏天伤于暑邪，秋天就会发生疟疾。秋天伤于湿邪，气机上逆而咳嗽，发为痿厥。冬天伤于寒邪，春天必发温病。四季之气，交替伤害五脏。
阴精的产生，根本在于五味；阴的五脏，损伤也在于五味。所以味道过于酸，肝气就会溢满，脾气就会绝灭。味道过于咸，大骨气劳损，肌肉短缩，心气受到抑制。味道过于甘，心气喘满，面色发黑，肾气不平衡。味道过于苦，脾气不濡润，胃气变得浓浊。味道过于辛，筋脉松弛，精神受损。所以要谨慎调和五味，使骨骼端正，筋脉柔和，气血流通，腠理致密，这样骨气就会精坚，遵循道法，就能享有长久的天命。
Huangdi said: Since ancient times, the connection between humans and nature is the root of life, which originates from Yin and Yang. Within the heaven and earth, inside the six directions, the Qi connects with the nine provinces, nine orifices, five zang organs, and twelve joints, all communicating with the heavenly Qi. Life is generated based on the Five Elements, and its Qi operates in three aspects (Heaven, Earth, and Humanity). If one frequently violates these principles, pathogenic Qi will harm the body; this is the foundation of longevity.
The Qi of the blue sky, when pure and tranquil, keeps the will and mind regulated. Following it consolidates the Wei Qi (Defensive Qi); even if harmful pathogens attack, they cannot cause injury. This is due to following the sequence of seasons. Therefore, the sages conserve their spirit, assimilate the heavenly Qi, and communicate with divine clarity. Failure to do so results in the internal blockage of the nine orifices, external stagnation of muscles, and the dispersion and dissolution of Wei Qi (Defensive Qi). This is called self-injury, leading to the depletion of Qi.
Yang Qi is like the sky and the sun. If it loses its proper position, lifespan is shortened and brilliance is obscured; thus, the movement of heaven relies on sunlight for illumination. Therefore, Yang Qi resides above and guards the exterior. When affected by Cold, Yang Qi should move flexibly like a door pivot; if daily activities are disturbing and restless, Shen Qi (Spiritual Qi) becomes floating. When affected by Summerheat, sweating occurs; if vexed, there is panting and loud breathing; if quiet, there is excessive talking. The body feels like burning charcoal, and the heat dissipates upon sweating. When affected by Dampness, the head feels as if wrapped; if Damp-Heat is not cleared, the large tendons shorten and the small tendons elongate. Shortening leads to spasms (Ju Luan), while elongation leads to flaccidity (Wei Zheng). When affected by Wind Qi, swelling occurs; if the four extremities alternate in damage, Yang Qi is exhausted.
When Yang Qi is subjected to excessive fatigue and labor, it hyperactivates. With repeated accumulation of essence depletion, it causes Jian Jue (Frying Collapse) in summer. Symptoms include blindness preventing vision and deafness preventing hearing. The condition is critical, resembling a collapsing dam, with torrents unstoppable. When Yang Qi is triggered by great anger, form and Qi become severed, and blood stagnates at the upper part, causing Bo Jue (Thin Collapse). If tendons are injured, they become lax, rendering limbs immobile. Hemihidrosis (sweating on only one side) leads to hemiplegia (Pian Gu). Sweating followed by exposure to dampness generates acne and miliaria (Cuo Fei). Excessive consumption of rich food and wine can lead to large carbuncles; pathogenic invasion is as easy as holding an empty vessel. Labor-induced sweating exposed to wind, where cold compresses the skin, forms acne (Za); stagnation leads to pustules (Cuo).
Yang Qi’s refined aspect nourishes the Shen (Spirit), and its soft aspect nourishes the tendons. If opening and closing functions fail, Cold Qi follows and enters, causing severe kyphosis (Da Lou). Pathogens sinking into meridians linger in muscle intervals. Acupoint Qi transforms thinly, transmitting fear and惊骇 (startle/terror). Ying Qi (Nutritive Qi) does not flow smoothly, reversing in muscle textures, generating carbuncles and swellings. If Po Han (corporeal sweat) is not fully expelled, the form weakens and Qi is scorched; acupoints close, developing Wind Malaria (Feng Nue). Thus, Wind is the beginning of all diseases. If one remains tranquil, muscle intervals close and resist; even strong winds and severe toxins cannot harm. This follows the seasonal order. However, prolonged illness leads to transformation and transmission; if Upper and Lower Qi do not connect, even good physicians cannot help.
Yang Qi accumulation leads to death when Yang Qi is blocked. Blockage requires purging. Without prompt correct treatment, incompetent doctors will ruin the patient. Yang Qi governs the exterior during the day. At dawn, human Qi arises; at noon, Yang Qi is peak; at sunset, Yang Qi is deficient, and the Qi Gates (pores) close. Therefore, in the evening, one should gather and resist, not disturb sinews and bones, and avoid fog and dew. Reversing these three times leads to physical exhaustion.
Qibo said: Yin stores essence and rises urgently to support Yang; Yang guards the exterior and maintains solidity. If Yin cannot overcome Yang, pulse flow becomes rapid and forceful, leading to mania (Kuang). If Yang cannot overcome Yin, the Qi of the five Zang organs contends, and the nine orifices become blocked. Thus, sages arrange Yin and Yang, harmonizing sinews and vessels, solidifying marrow, and ensuring smooth Qi and Blood. In this state, interior and exterior are harmonious, pathogens cannot harm, ears and eyes are clear, and Qi stands as usual.
Wind pathogens invading and disrupting Qi cause essence loss and liver injury. After overeating, sinews and vessels relax transversely, and intestinal stasis causes hemorrhoids. After drinking excessively, Qi rebels upward. After strenuous sexual activity, Kidney Qi is injured, and high bones (vertebrae) deteriorate. The key to Yin and Yang is that dense Yang ensures solidity. If the two are disharmonious, it is like spring without autumn or winter without summer. Harmonizing them according to principle is called the sage's standard. If Yang is strong but not dense, Yin Qi perishes. If Yin is peaceful and Yang is secret, Spirit is governed. If Yin and Yang separate and decide, Essence and Qi perish. Exposure to wind generates cold and heat disorders.
Spring wind injury leaves lingering pathogens, causing severe diarrhea (Dong Xie). Summer heat injury manifests as malaria in autumn. Autumn dampness injury causes rebellious Qi, coughing, and flaccidity-cold (Wei Jue). Winter cold injury leads to warm diseases in spring. The Qi of the four seasons alternately injures the five Zang organs.
Yin is generated from the Five Flavors; the five Yin palaces are damaged by the Five Flavors. Excessive sour flavor causes Liver Qi to overflow and Spleen Qi to cease. Excessive salty flavor labors the large bones, shortens muscles, and suppresses Heart Qi. Excessive sweet flavor causes Heart Qi to pant and distend, black complexion, and unbalanced Kidney Qi. Excessive bitter flavor makes Spleen Qi non-moist and Stomach Qi thick. Excessive pungent flavor causes sinews and vessels to slacken and damages Spirit. Therefore, carefully harmonize the Five Flavors to keep bones straight, sinews flexible, Qi and Blood flowing, and interstices dense. In this way, bone Qi becomes refined. Following the Dao and methods ensures a long lifespan.