汗为心液。心阳固留。在内为血。发外汗流。伤于客感。 汗浮。发汗而汗。邪随汗休。必以汗愈。去病之由。
汗而为病。
病从汗搜。自汗盗汗。二者是求。阴虚阳凑。发热汗稠。阳虚阴乘。发厥汗 。心肾俱弱。自汗堪忧。腠疏肤嫩。邪热
内仇。热搏心主。液不内兜。睡中汗出。其醒则否。或伤冷热。阴阳相勾。津液走泄。肌体遍周。此皆盗汗。惟虚是谋。
饮食饥饱。胃汗外投。惊而夺精。心汗浏浏。持重远行。肾汗悠悠。疾走恐惧。肝胆汗游。力作劳苦。脾汗飕 。经言
脏腑。各不相侔。总之汗病。日久体柔。骨蒸疳瘵。惊痫筋抽。黄瘦疲弱。汗冷如揉。凡诸变症。悉皆可愁。他如阳脱。
其汗在头。心空之汗。当心逗遛。命绝之汗。如珠如油。各从病决。医法方优。
钱乙曰。六阳虚汗。上至顶。不过胸也。不须治之。
曾氏曰。小儿脾虚。自汗。多出额上。沾黏人手。速救胃气。沉香饮。脾虚泻自汗。遍身冷而出有时。遇泻则无。
泻过即有此候。大虚急当补脾。益黄散、参苓白术散。肺虚自汗。右脸色多 白。肺脉按之无力。盖久因咳嗽连声不已。
痰滞不活。乃肺经虚气上壅。致令汗出。宜补肺散。及以藿香饮调脾。此又益母救子之义也。慢惊自汗。遍体俱有。其
冷如冰。此症已危，金液丹、固真汤。实症自汗。外因感冒风邪
发热。无问昏醒。浸淫汗出。当急救表解肌。百解散。胃怯汗。上至顶。下至脐。此胃虚。当补胃。益黄散。
汗是心的体液。心阳固摄留存，在内化为血液，在外则表现为汗液流出。若受外邪侵袭，汗液浮越于表。通过发汗使汗出，病邪随汗而解，疾病必然痊愈，这是去除病因的方法。
汗出本身可能成为致病因素。
疾病往往从汗孔侵入。自汗和盗汗，需要对此进行辨析求因。阴虚导致阳气凑集，出现发热且汗液黏稠；阳虚导致阴寒乘袭，出现四肢厥冷且出汗。心肾两脏俱弱，自汗令人担忧。腠理疏松、肌肤娇嫩，邪热内侵与正气相争。热邪搏结于心主，津液不能内守。睡眠中出汗，醒来后停止。或者因感受冷热之邪，阴阳相互牵引，津液流失，遍布全身肌体。这些都属于盗汗，根本原因在于虚损。
饮食饥饱失常，导致胃汗外泄。受惊吓耗夺精气，导致心汗淋漓。负重远行，导致肾汗悠悠而出。疾走恐惧，导致肝胆之汗游走。强力劳作辛苦，导致脾汗飕飕而出。经书言明脏腑各自不同。总之，汗证日久会导致身体柔弱。出现骨蒸潮热、疳积劳瘵、惊风抽搐等症。面色萎黄消瘦、疲乏虚弱，冷汗如油般揉搓状。各种变生之症，都令人忧愁。其他如阳气脱失，其汗仅在头部；心气空虚之汗，当心前区逗留；命绝之汗，如珠如油。根据病情判断，治疗方法才显得优越。
钱乙说：六阳经虚导致的汗出，上至头顶，但不超过胸部。不需要治疗。
曾氏说：小儿脾虚自汗，多出现在额头，沾黏人手。需迅速挽救胃气，用沉香饮。脾虚腹泻兼自汗，遍身发冷且出汗有时，遇到腹泻时不出汗，腹泻过后即有此症状。大虚急当补脾，用益黄散、参苓白术散。肺虚自汗，右脸色多苍白，肺脉按之无力。大概是因为久咳不止，痰滞不活，乃肺经虚气上壅，导致汗出。宜用补肺散，并用藿香饮调理脾胃。这又是“益母救子”（培土生金）的道理。慢惊风自汗，遍体都有，其冷如冰。此症已危重，用金液丹、固真汤。实症自汗，外因感冒风邪发热，无论昏睡还是清醒，浸淫汗出。应当急救解表祛邪，用百解散。胃怯汗，上至头顶，下至肚脐。这是胃虚，应当补胃，用益黄散。
Sweat is the fluid of the Heart. When Heart Yang (Heart Fire) secures and retains it, internally it becomes Blood, and externally it flows out as sweat. If injured by external pathogens, sweat floats on the surface. By inducing sweating to expel sweat, the pathogen subsides with the sweat, and the disease must be cured; this is the method to remove the cause of illness.
Sweating itself can become a pathology.
Diseases often invade through the sweat pores. Spontaneous sweating (Zi Han) and night sweating (Dao Han), these two require investigation to find their origin. Yin deficiency leads to Yang encroachment, causing fever and thick/sticky sweat; Yang deficiency allows Yin to overpower, causing cold limbs (Jue) and sweating. When both Heart and Kidney are weak, spontaneous sweating is worrying. With loose interstices (Cou Li) and tender skin, pathogenic heat invades internally and contends with healthy qi. Heat combats the Master of the Heart, and fluids fail to be retained internally. Sweating occurs during sleep but stops upon waking. Or, due to injury from cold or heat, Yin and Yang interact, causing body fluids to leak and spread throughout the muscles and body. These all belong to night sweating, where only deficiency is sought as the root.
Irregular diet (hunger or fullness) causes Stomach sweat to escape externally. Fright depletes Essence, causing Heart sweat to flow profusely. Carrying heavy loads and traveling far causes Kidney sweat to flow leisurely. Running fast and feeling fear causes Liver and Gallbladder sweat to wander. Forceful labor and hardship cause Spleen sweat to whistle forth. The Classics state that Zang-Fu organs differ from one another. In summary, chronic sweating diseases lead to physical frailty. Symptoms include bone-steaming tidal fever, infantile malnutrition (Gan syndrome), consumption, fright convulsions, and muscle twitching. Yellowish emaciation, fatigue, and weakness, with cold sweat like oil being rubbed. All such complicated symptoms are indeed distressing. Others include: Yang collapse, where sweat is only on the head; Heart emptiness sweat, lingering at the heart region; death-bound sweat, resembling beads or oil. Judgment depends on the disease, and medical methods then prove superior.
Qian Yi said: Sweat due to deficiency of the Six Yang channels reaches up to the vertex but does not exceed the chest. It requires no treatment.
Zeng Shi said: For children with Spleen deficiency and spontaneous sweating, it mostly appears on the forehead, sticking to human hands. One must quickly rescue Stomach Qi using Chenxiang Yin (Aromatic Wood Drink). For Spleen deficiency diarrhea with spontaneous sweating, the whole body feels cold and sweating occurs intermittently; there is no sweating during diarrhea, but this symptom appears immediately after diarrhea passes. Severe deficiency urgently requires tonifying the Spleen, using Yihuang San (Yellow Benefit Powder) or Shenling Baizhu San (Ginseng, Poria, and Atractylodes Macrocephala Powder). For Lung deficiency spontaneous sweating, the right cheek color is often pale white, and the Lung pulse is powerless upon palpation. This is likely due to prolonged coughing without relief, causing phlegm stagnation and inactivity, leading to deficient Qi rising and obstructing the Lung channel, resulting in sweating. One should use Bufei San (Lung Tonification Powder) and regulate the Spleen with Huoxiang Yin (Agastache Drink). This embodies the principle of "benefiting the mother to save the child" (tonifying Earth to generate Metal). For slow convulsion with spontaneous sweating, it covers the entire body, feeling cold as ice. This condition is critical; use Jinye Dan (Golden Liquid Pill) or Guzhen Tang (Solidify True Decoction). For excess-type spontaneous sweating caused externally by wind-pathogen invasion and fever, whether unconscious or awake, with oozing sweat, one must urgently rescue the exterior and release the muscle layer, using Baijie San (Hundred Resolutions Powder). For Stomach timidity sweat, reaching from the vertex to the navel, this is Stomach deficiency, requiring Stomach tonification, using Yihuang San.