伤寒阴阳易之为病，其人身体重，少气，少腹里急，小便不利，阴中拘挛，热上冲胸，头重不欲举，眼中生
花，膝胫拘急者，烧 散主之。
此证无内外因，本非伤寒而冠以伤寒者。原其因也，无恶寒发热之表证，无胃实自利之里证，因淫情之不
禁，而余邪得以投其隙，移祸于不病之人，顿令一身之精气神形，皆受欲火之为害。是不病于伤寒，而病于阴阳
之易也。
勿得以男女分名也。夫邪之所凑，其气必虚。阴虚而淫邪凑之，故少气而热上冲胸。气少不能运躯，故头重不
举，身体皆重。邪中于阴，故阴中拘挛。冲任脉伤，故小腹里急。精神散乱，故眼中生花。摇动筋骨，故膝胫拘
急。病由于肾，毒侵水道，故小便不利耳。谅非土木金石之味所能愈，仍须阴阳感召之理以制之，斯 裆之以
意相求也。
烧 散∶
上取妇人中 近隐处者，剪烧灰，以水和服方寸匕，日三服，小便即利，阴头微肿则愈。妇人病，取男子
裆烧灰。
裆者，男女阴阳之卫，阴阳之以息相吹、气相聚、精相向者也。卫乎外者，自能清乎内。感于无形者，
治之以有形。故取其近隐处烧而服之，形气相感，得其隐曲，小便即利。阴头微肿，浊阴走下窍，斯清阳出上窍，
欲火平而诸证悉除矣。男服女，女服男，仍合阴阳交易之理、男女媾精之义、格物之情。至秽之品，为至奇之方，
有如此者。
伤寒病后阴阳易这种病症，患者身体沉重，气短乏力，小腹部拘急疼痛，小便不通畅，外生殖器拘挛紧缩，热气上冲至胸部，头部沉重不想抬起，眼前发黑视物模糊，膝盖和小腿拘挛僵硬，应当用烧裈散来主治。
这种证候没有明显的外感或内伤病因，原本不是伤寒病，却冠以“伤寒”之名。推究其成因，并没有恶寒发热等表证，也没有胃家实或自利等里证，而是因为情欲失控，导致体内残留的病邪乘虚而入，将祸害转移给未患病的人，顿时使全身的精、气、神、形都受到欲火的危害。这并不是因为患伤寒而致病，而是由于阴阳之气相互交换感染所致。
不要仅仅从男女角度去区分命名。大凡邪气聚集的地方，正气必然虚弱。阴气虚弱而淫邪侵袭，所以出现气短和热气上冲胸部的症状。气少不能推动躯体运行，所以头部沉重抬不起来，全身都觉得沉重。邪气侵入阴部，所以外生殖器拘挛紧缩。冲脉和任脉受损，所以小腹部拘急疼痛。精神散乱，所以眼前视物模糊如见花斑。动摇筋骨，所以膝盖和小腿拘挛僵硬。病根源于肾脏，毒邪侵犯水道，所以小便不通畅。料想并非草木金石类的药物所能治愈，仍然需要依据阴阳感召的道理来制约它，这就是取用裤裆（裈）通过意念相求的方法。
烧裈散的制法与用法：
取妇人中极近隐蔽处的布料，剪下烧成灰，用水调服一方寸匕的量，每天服用三次，小便通畅后，阴头轻微肿胀即为痊愈。如果是女性患病，则取男子的裤裆烧成灰服用。
裤裆是男女阴阳的卫护之物，是阴阳气息相互吹拂、气机相聚、精气交汇的地方。护卫于外的，自然能清肃于内。感受于无形之邪，就用有形之物来治疗。所以取用靠近隐蔽处的布料烧灰服用，利用形气相互感召，得其隐秘曲折之理，小便随即通畅。阴头轻微肿胀，说明浊阴之气向下窍排出，这样清阳之气就能从上窍出，欲火平息，各种症状全部消除。男性服用女性的，女性服用男性的，这依然符合阴阳交易互换的道理、男女交合精气的意义以及格物致知的情理。极其污秽的物品，却能成为极其奇妙的方剂，就是像这样的道理。
In the aftermath of a cold damage disease, the condition known as Yin-Yang Exchange (Yin Yang Yi) manifests with the patient experiencing heavy body sensations, shortness of breath, urgency and tightness in the lower abdomen, difficulty in urination, spasms in the genitalia, a sensation of heat rushing up to the chest, heaviness in the head making one reluctant to lift it, visual disturbances such as seeing spots before the eyes, and stiffness or cramping in the knees and shins. This should be primarily treated with Shao Kun San (Burned Underwear Powder).
This syndrome lacks both external and internal causes; originally, it is not a cold damage disease, yet it is prefixed with "cold damage." Investigating its etiology, there are no exterior symptoms like aversion to cold and fever, nor interior symptoms like stomach excess or spontaneous diarrhea. It arises from uncontrolled sexual desire, allowing residual pathogenic factors to exploit the void, transferring the affliction to an otherwise healthy person. Instantly, the essence, qi, spirit, and form of the entire body suffer the harm of lustful fire. Thus, the illness is not due to contracting cold damage, but rather due to the exchange of Yin and Yang energies.
One should not distinguish the naming solely based on male or female genders. Wherever pathogenic factors gather, the vital energy must be deficient. When Yin deficiency allows lascivious pathogens to invade, it results in shortness of breath and heat rushing up to the chest. With insufficient Qi to move the body, the head feels heavy and difficult to lift, and the whole body feels heavy. Pathogens invading the Yin regions cause genital spasms. Damage to the Chong and Ren vessels leads to lower abdominal urgency. Scattered spirit and mind cause visual hallucinations or spots. Agitation of sinews and bones results in knee and shin cramping. The disease originates in the Kidney, where toxins invade the water passages, causing urinary difficulty. It is unlikely that herbs of wood, earth, metal, or stone can cure this; instead, one must rely on the principle of Yin-Yang resonance to control it. This is why Kun (underwear) is used, seeking connection through intent.
Preparation and Administration of Shao Kun San (Burned Underwear Powder):
Take cloth from the area closest to the genitals of a woman, cut it off, burn it into ash, mix with water, and administer one Fang Cun Bi (a square-inch measure) per dose. Take three times daily. Once urination becomes smooth and the glans penis shows slight swelling, the patient will recover. If the patient is a woman, take the underwear of a man and burn it into ash for administration.
The Kun (underwear) serves as the guard of Yin and Yang for both men and women, where Yin and Yang breathe into each other, Qi gathers, and Essence converges. What guards the exterior can naturally clear the interior. For pathogens contracted invisibly, treatment employs tangible objects. Therefore, taking the cloth from the hidden area, burning it, and ingesting it utilizes the mutual induction of Form and Qi, accessing the hidden and subtle mechanisms, leading to immediate urination. Slight swelling of the glans indicates that turbid Yin descends through the lower orifice, allowing Clear Yang to ascend through the upper orifices. The lustful fire calms, and all symptoms vanish. Men take the woman's, and women take the man's, adhering to the principles of Yin-Yang exchange, the meaning of male-female conjunction of essence, and the investigation of things' nature. An extremely filthy substance becomes an extraordinarily effective prescription, as seen here.