阴毒伤寒身体重。背强眼痛不堪任。小腹急痛口青黑。毒瓦斯冲心转不禁。
四肢厥冷惟思吐。不利咽喉脉细沉。若能速灸脐轮下。六日看过见喜深。
阴毒伤寒者。非传入之阴。乃阴毒之气。一时表里俱伤也。如身重背强。
眼痛口青黑。四肢厥冷。乃阴毒攻于表也。小腹痛。气冲心。思吐而咽喉
不利。乃阴毒攻于里也。内外俱为阴毒之气所伤。然阴病难已。当灸丹
田以回阳抑阴。况六日则阴已极矣。过此不死。延至七日。则一阳来复。
或可望其生云。
按活人书云。阴毒脉疾。七至八至以上。疾不可数者。正是阴毒已深也。
六脉沉细而疾。尺脉短小。寸口脉或大。若误服凉药。则渴转急。有此之
证者。便急服辛热之药。一日或二日便安。若阴毒渐深。其候沉重。四肢
逆冷。腹痛转甚。或咽喉不利。心下胀满结硬。燥渴虚汗不止。六脉俱沉
细而疾。一息七至以来。有此证者。速于气海关元二穴灸三二百壮。以
手足和暖为效。仍兼服正阳散。
又按刘守真云。然既脉疾。七至八至以上疾不可数者。正是阳热极甚
之脉也。世俗妄传阴毒诸证。以素问验之。皆阳热亢极之证。但热于内
在里极深。身表似其阴寒者也。及夫经云亢则害。承乃制也。谓五行之
道。实甚则过。极则反。以克己者也。是谓兼化。如万物热极。而反出水液。
以火炼金。热极而反化为水。是以火极。而反以水化也。
阴毒伤寒的症状是身体沉重。背部僵硬、眼睛疼痛，痛苦得难以忍受。小腹部急痛，口唇发青发黑。毒气上冲心脏，导致病情急剧恶化，无法自控。
四肢冰冷，只想呕吐。咽喉不利，脉象细而沉。如果能迅速在脐下施灸，过了六天看到好转，就会非常欣慰。
所谓的阴毒伤寒，并不是病邪由阳经传入阴经，而是阴毒之气在一瞬间使表里同时受到损伤。像身体沉重、背部僵硬、眼睛疼痛、口唇发青发黑、四肢冰冷，这是阴毒侵袭体表的表现。小腹痛、气逆冲心、想呕吐且咽喉不利，这是阴毒侵袭体内的表现。内外都受到了阴毒之气的伤害。然而阴证难以治愈，应当艾灸丹田穴以回阳抑阴。况且到了第六天，阴气已经发展到极点。如果过了这个时期不死，拖延到第七天，那么一阳来复（阳气开始恢复），或许还有希望生存。
按《活人书》记载：阴毒的脉象急促，每息七至八次以上，疾速到无法计数的程度，这正是阴毒已经很深的表现。六部脉象都沉细而疾速，尺脉短小，寸口脉有时变大。如果误服寒凉药物，口渴会加剧。出现这些症状的人，应立即服用辛热性质的药物，一天或两天就能痊愈。如果阴毒逐渐加深，症状变得沉重，四肢逆冷，腹痛加剧，或者咽喉不利，心下部胀满结硬，烦躁口渴，虚汗不止，六部脉象都沉细而疾速，一息七次以上。出现这些症状的人，应迅速在气海、关元两个穴位各灸三二百壮，以手足变暖为见效标准。同时兼服正阳散。
又按刘守真所说：既然脉象急促，每息七至八次以上，疾速到无法计数，这实际上是阳热极盛的脉象。世俗错误地流传所谓阴毒的各种证候，用《素问》来验证，其实都是阳热亢盛至极的证候。只是热邪在体内深处，体表现象似乎像阴寒一样。正如经典所说“亢则害，承乃制”，意思是五行的规律，太过就会造成危害，极盛就会发生反常，以克制自身。这叫做兼化。就像万物热到极点，反而产生水液；用火炼金，热到极点反而化为水。这是因为火到了极点，反而转化为水的性质。
The symptoms of Yin Poison Cold Damage (Yin Du Shang Han) include a heavy body. Stiffness in the back and pain in the eyes are unbearable. There is acute pain in the lower abdomen, and the lips turn blue-black. The toxic qi rushes to the heart, causing the condition to deteriorate rapidly and become uncontrollable.
The four limbs are cold, and there is an urge to vomit. The throat is uncomfortable, and the pulse is fine and deep. If moxibustion can be performed quickly below the navel, and improvement is seen after six days, one will feel deeply relieved.
What is called Yin Poison Cold Damage is not the transmission of pathogenic factors from the Yang meridians to the Yin meridians, but rather the simultaneous injury to both the exterior and interior by Yin toxic qi at once. Symptoms such as a heavy body, stiff back, eye pain, blue-black lips, and cold four limbs indicate that Yin poison is attacking the exterior. Lower abdominal pain, Qi rushing to the heart, the urge to vomit, and discomfort in the throat indicate that Yin poison is attacking the interior. Both the interior and exterior are injured by Yin toxic qi. However, Yin syndromes are difficult to cure; one should perform moxibustion on the Dantian acupoint to restore Yang and suppress Yin. Moreover, by the sixth day, Yin has reached its extreme. If death does not occur after this point, and it extends to the seventh day, when Yang Qi begins to recover (One Yang Returns), there may be hope for survival.
According to the *Huo Ren Shu* (Book of Saving Lives): In Yin Poison, the pulse is rapid, exceeding seven or eight beats per respiration, so fast that it cannot be counted; this precisely indicates that Yin Poison is already deep. All six pulses are deep, fine, and rapid; the Chi pulse is short and small, while the Cun Kou pulse may sometimes be large. If cooling medicines are mistakenly administered, thirst will intensify. For those presenting these signs, pungent-hot medicines should be taken immediately, and recovery can be expected within one or two days. If Yin Poison gradually deepens, the manifestations become severe: cold limbs extending upwards, worsening abdominal pain, throat discomfort, fullness and hardness in the epigastrium, irritability with thirst, and incessant deficiency sweating. The six pulses are all deep, fine, and rapid, exceeding seven beats per respiration. For those with these symptoms, perform 300-200 moxa cones on the Qihai and Guanyuan acupoints until the hands and feet become warm. Concurrently administer Zheng Yang San.
Furthermore, according to Liu Shouzhen: Since the pulse is rapid, exceeding seven or eight beats per respiration to the point of being uncountable, this is actually a pulse of extreme Yang heat. The secular world erroneously transmits various syndromes of "Yin Poison." Verified against the *Su Wen* (Basic Questions), these are all syndromes of extreme Yang heat hyperactivity. The heat is merely extremely deep within the interior, making the exterior appear similar to Yin-cold. As the classics state, "Hyperactivity causes harm, and succession brings regulation" (Kang Ze Hai, Cheng Nai Zhi). This refers to the principle of the Five Elements: excess leads to overreach, and extremity leads to reversal, acting to restrain oneself. This is called concurrent transformation. Just as things, when heated to the extreme, produce fluids; when fire smelts metal, extreme heat transforms into water. Thus, when Fire reaches its extreme, it transforms into Water.