经曰∶阳之汗，以天地之雨名之。又曰∶阳加于阴谓之汗。又曰∶心为汗。夫心之所藏，在内者为血，在外
者为汗。盖汗乃心之液，而自汗之证，未有不由心肾两虚而得之者。然阴虚阳必凑之，故发热而自汗，阳虚阴必凑
之，故发厥而自汗。是皆阴阳偏胜所致也。
小儿脏腑娇嫩，肤腠未密，或重衣浓被，致五内生热，热搏于心，故心液不能自藏而额汗出也。额为心之位，
宜收敛心气，团参汤。
大病后气血两虚，津液自汗，或潮热，或寒热，发过之后身凉。自汗日久，令人黄瘦，失治则变蒸疳，宜黄
固真汤。
睡中汗出，醒来则止。此心虚盗汗，宜敛心气、养心血，用团参汤。
睡中遍身有汗，觉来久不干者，此食积盗汗，脾冷所致。益黄散。
脾虚泄泻，自汗后而遍身冷，有时遇泻则无汗，不泻则有汗。此为大虚之候，急当补脾，理中汤；待泻止，
黄固真汤
凡自汗上至胸，下至脐，此胃虚也。当补胃，四君子汤加黄 。
肺虚自汗，面白唇白，六脉无力。盖因久嗽脾虚，故令自汗。四君子汤加麦冬、五味。
伤风自汗，宜实表，桂枝汤；伤寒汗出，自头至颈而止者，欲发黄也，茵陈汤。如有实热在内，烦躁汗出不
止者，胃实也，宜集成沆瀣丹微下之。
诸汗服药久不止者，用五倍子一个研细末，醋和作一小饼，贴肚脐，以带扎之，效。
The *Yellow Emperor's Inner Canon* states: The sweat of Yang can be named after the rain of heaven and earth. It also states: When Yang acts upon Yin, it is called sweat. Furthermore, it states: The Heart governs sweat. What the Heart stores internally is blood, while what manifests externally is sweat. Sweat is essentially the fluid of the Heart. Cases of spontaneous sweating (Zihan) invariably arise from deficiency of both the Heart and Kidney. However, when Yin is deficient, Yang inevitably converges upon it, resulting in fever accompanied by spontaneous sweating; when Yang is deficient, Yin inevitably converges within, resulting in cold extremities (Jue) accompanied by spontaneous sweating. These are all caused by an excess of either Yin or Yang.
Children have delicate Zang-Fu organs and loose skin pores. If dressed too heavily or covered with thick quilts, heat may generate internally within the five Zang organs. This heat combats with the Heart, causing the Heart fluid to fail in self-retention, leading to sweating on the forehead. The forehead is the domain of the Heart; thus, one should converge Heart Qi using Tuanshen Tang.
After a severe illness, both Qi and Blood are deficient, leading to spontaneous sweating due to leakage of body fluids, tidal fever, or alternating chills and fever, followed by cooling of the body after the episode. Prolonged spontaneous sweating causes sallow complexion and emaciation; if untreated, it may transform into infantile malnutrition (Gan syndrome). Huanggu Zhen Tang is indicated.
Sweating during sleep that ceases upon waking is盗汗 (Dao Han, night sweats) due to Heart deficiency. One should converge Heart Qi and nourish Heart Blood using Tuanshen Tang.
Whole-body sweating during sleep that remains wet for a long time after waking is盗汗 (Dao Han, night sweats) due to food retention, caused by Spleen cold. Yihuang San is indicated.
In cases of Spleen deficiency with diarrhea, spontaneous sweating is followed by whole-body coldness. Sometimes there is no sweating during diarrhea, but sweating occurs when not having diarrhea. This indicates a state of great deficiency; immediate tonification of the Spleen is required using Lizhong Tang. After diarrhea stops, Huanggu Zhen Tang should be used.
Spontaneous sweating extending from the chest upwards to the upper chest and downwards to the navel indicates Stomach deficiency. The Stomach should be tonified using Sijunzi Tang added with Huangqi.
Lung deficiency with spontaneous sweating presents with pale face and lips, and weak pulses in all six positions. This is often due to prolonged coughing leading to Spleen deficiency, which in turn causes spontaneous sweating. Sijunzi Tang added with Maidong and Wuweizi is indicated.
For spontaneous sweating due to wind-cold injury, the exterior should be secured using Guizhi Tang. For sweating due to cold damage, where sweat is limited from head to neck, jaundice is likely to develop; Yinchen Tang is indicated. If there is excess heat internally causing restlessness and incessant sweating, this indicates Stomach excess; Jicheng Hangxie Dan should be used to mildly purge.
For various sweating conditions that do not cease despite prolonged medication, grind one Wubeizi (Chinese Gall) into fine powder, mix with vinegar to form a small cake, apply to the umbilicus, and secure with a belt. This is effective.