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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Sweat is the fluid of the Heart. It also states: When Yang acts upon Yin, it is called sweat. From this, we can deduce that this is Yang-heat acting upon Yin-blood, dispersing to the exterior to become sweat. However, there is a distinction between spontaneous sweating (Zihan) and night sweating (Daohan). Cheng Wuji stated: Spontaneous sweating is sweating without the use of diaphoretic treatment; night sweating is sweating during sleep. Reflecting on this, spontaneous sweating and night sweating are the same fluid, but their exit differs. "Night" (Dao) is like theft, emerging stealthily when one breathes, moving within the Yin; "Spontaneous" (Zi) is like nature, always present and obvious, manifesting in the Yang. Both occur because the Couli (skin pores) are loose, and the Wei-Qi (Defensive Qi) is deficient, failing to consolidate and converge at the exterior. Deficiency leads to the leakage of Yang-heat. Yang moves and scatters body fluids, traveling to the Liver. If Yang-heat steams the Yang aspect causing fluid discharge, it is spontaneous sweating; if Yang-heat steams the Yin aspect causing fluid discharge, it is night sweating. Thus, by distinguishing internal Yin-Yang deficiency and external Couli closure, one finds the source. All these result from the deficiency of both the Heart and Kidney. Yin deficiency causes Yang to gather, leading to fever and spontaneous sweating; Yang deficiency causes Yin to invade, leading to cold extremities and spontaneous sweating. Yin-Yang excess involves wind-stroke and heatstroke. Therefore, the classics state: Wind entering from outside causes sweating, headache, heavy body, and aversion to cold; hot weather with thick clothes causes sweating, while cold weather with thin clothes causes increased urination. Patients with Bi syndrome often sweat and are damp due to severe dampness. Excess Yin leads to excessive sweating and cold body; excess Yang leads to hot body but not much sweating; labor consumes Qi, causing panting and sweating. Overeating causes sweat from the Stomach; fright depletes Essence, causing sweat from the Heart; carrying heavy loads and walking far causes sweat from the Kidneys; running fast and fearing causes sweat from the Liver; bodily exertion causes sweat from the Spleen. Sometimes, after eating hot food, sweat appears before the Stomach Qi settles, appearing on the face, back, or body, not following the normal path of Stomach Qi. This is because wind injury opens the Couli internally, hair steams, and Couli leak, causing Wei-Qi to wander, thus not following its usual path. This Qi is fierce and rapid, so it cannot follow its proper route, named "Lou Xie" (Leakage). Fright, sexual exhaustion, extreme deficiency, and phlegm-fluid retention can also cause this condition. In diagnosis, a choppy and slippery Chi pulse indicates excessive sweating; in men, a flat pulse that is deficient, fine, and minute indicates susceptibility to night sweating. Considering the differences in exterior-interior and deficiency-excess, their medications vary. Listing various schools' formulas and theories, one should observe suitability and use them. The classics mention a disease with hot body, flaccidity, profuse sweating like bathing, aversion to wind, and shortness of breath, named "Jiu Feng" (Wine Wind). Zhang Zhongjing of Changsha stated: Taiyang disease with headache, fever, sweating, and aversion to wind; after treating Taiyang with diaphoretics, sweating continues unceasingly, the person feels aversive to wind, has difficulty urinating, slight stiffness in the four limbs making flexion and extension difficult; this is Taiyang Heatstroke, characterized by sweating, aversion to cold, hot body, and thirst. These five Taiyang syndromes depend entirely on the physician treating them with appropriate herbs for the meridian. Should cooling be used when heat is indicated, or heating when cooling is indicated? This is the physician's fault. The *Jingui Yaolue* states: For wind-dampness with floating pulse, heavy body, sweating, and aversion to wind, removing dampness and consolidating Couli is the priority. Li Dongyuan stated: Self-sweating due to diet and fatigue should be treated with sweet-warm agents to nourish the Qi of skin and hair; one should not allow self-sweating to damage Yuan Qi. Summer-heat invading Wei-Qi causes hot body and spontaneous sweating, treated with Qing Shu Yi Qi Tang. The *Shixiao Fang* states: For severe damp-heat with continuous sweating, agents that overcome dampness are most appropriate. Wang Haocang stated: Taiyang spontaneous sweating uses Guizhi Tang; Yangming spontaneous sweating uses Baihu Tang; Shaoyin spontaneous sweating uses Sini Tang; Yangming fever with excessive spontaneous sweating uses Dachengqi Tang. These are all pathogens of internal injury and external contraction invading Wei-Qi and exiting. These formula theories were established by predecessors; later students who understand meridians can achieve efficacy using them. Those who do not understand pulse theory and misidentify meridians will cause serious harm. Regarding night sweating, unlike spontaneous sweating which may have excess patterns, this is caused by Yang-heat invading and steaming out, with Yin fluids overflowing to the exterior, indicating Yin deficiency and exterior deficiency. The sweat occurs during sleep; during sleep, Wei-Qi moves inward; upon waking, Qi disperses to the exterior, and sweating stops. Thus, the classics state: Taiyang manifestations include night sweating. Li Dongyuan considered Taiyang as Old Yang. Taiyang has the name of Yang but lacks the substance of Yang, regarding the true cold of the Bladder as pure Yin Qi. The *Lanshi Micang* treats this syndrome with agents such as Huanglian (Coptidis Rhizoma), Shengdihuang (Rehmanniae Radix), and Danggui (Angelicae Sinensis Radix) to nourish Yin and restrain Yang-heat, stopping sweat through stillness. This is its discussion.