太阳病有身痒阳明病有身如虫行俱为荣卫气虚微邪在表无从而出故有为痒如虫行之状也悉宜各半汤太阳病得之八
九日如疟状发热恶寒热多寒少其人不呕清便欲自可一日二三度发脉微缓者为欲愈也脉微而恶寒者此阴阳俱虚不可更发
汗更下更吐也面色反有热色者未欲解也以其不能得小汗出身必痒宜桂枝麻黄各半汤
阳明病法多汗反无汗其身如虫行皮中状者此久虚故也（宜桂枝麻黄各半汤活人用术附汤黄 建中汤）
赵 虫行皮中
状者即经言身痒是也久虚者以表气不足津液不充于皮肤使腠理枯涩汗难出也若谓虚则当补毕竟阳明受邪为病邪可补乎
如用术附黄 辈皆收汗药则荣卫郁闭邪无从出内热发矣何况其病又无吐利胃虚等证病不在里但皮肤中表气虚之理宜和
解可也莫若除中借用各半汤或有热者柴胡桂枝汤庶乎甘辛之剂可以和其荣卫通行津液而解未审当否
成 除中者藏寒应不能食今反能食者是也有二证悉属厥阴藏寒其一证由误服黄芩汤凉药而致期以必死其一则热
少
厥多胃气在者必愈恐暴来出而复去者死其热续在者生此不因药故也
伤寒脉迟六七日而反与黄芩汤彻其热脉迟为寒今与黄芩汤复除其热腹中应冷当不能食今反能食此名除中必死眼睛
不慧语言不出而谷食反多者此为除中口虽欲言舌不能言凡手足厥冷而利不当食而食者恐为除中试与索饼食之发热者除
中不发热者非也（详见厥门）
太阳病出现身体瘙痒，阳明病出现身体像有虫子在皮肤里爬行的感觉，这都是因为营卫之气虚弱，微邪停留在体表无法排出，所以会出现像虫行一样的瘙痒症状。这种情况都适宜使用桂枝麻黄各半汤。
太阳病经过八九日，症状像疟疾一样，发热多而恶寒少，病人没有呕吐，大小便基本正常，一天发作两三次，脉象微微缓和的，这是将要痊愈的表现；如果脉象微弱且恶寒，这是阴阳俱虚，不可再用发汗、攻下或催吐的方法。如果面色反而发红，说明病邪尚未解除，是因为不能通过微微出汗来排邪，身体一定会发痒，适宜使用桂枝麻黄各半汤。
阳明病通常应该多汗，反而无汗，身体像有虫子在皮肤中爬行，这是因为久病体虚所致（适宜使用桂枝麻黄各半汤，《活人书》使用白术附子汤或黄芪建中汤）。
赵氏认为：身体像有虫子在皮肤中爬行的感觉，就是经书中所说的身体瘙痒。所谓“久虚”，是因为表气不足，津液不能充盈于皮肤，导致腠理枯涩，汗液难以排出。如果说既然是虚证就应当补益，但毕竟阳明经受邪致病，邪气难道可以用补法吗？如果使用白术、附子、黄芪这类收敛止汗的药物，会导致营卫郁闭，邪气无从排出，内热就会发作。何况这个病症又没有呕吐、腹泻等胃气虚弱的表现，病位不在里，只是皮肤表层的气虚，适宜用和解的方法。不如借用桂枝麻黄各半汤，如果有热象，可以使用柴胡桂枝汤，这样甘辛合用的药物可以调和营卫，通行津液从而解表，不知道是否恰当。
成无己认为：除中，是指脏腑寒冷本应不能进食，现在反而能进食的现象。这有两种证候，都属于厥阴病的脏寒。其中一种证候是由于误服黄芩汤等凉药导致的，预后为必死；另一种则是热少厥冷多，如果胃气尚存则必定痊愈，担心的是阳气暴脱后随即离去而死，如果热气持续存在则生。这不是因为服药造成的。
伤寒脉迟，经过六七日，反而给予黄芩汤清除其热。脉迟属于寒证，现在又用黄芩汤去除其热，腹部应该变冷，应当不能进食，现在反而能进食，这叫做“除中”，预后必死。眼睛昏花不明，语言不出，反而谷物食物吃得多的，这就是除中。口虽然想说话但舌头不能言语，凡是手足厥冷且有下利，本不该进食却进食的，要担心是除中。试着给病人吃索饼（面条），如果发热的是除中，不发热则不是（详见厥阴病篇）。
Taiyang disease presenting with body itching, and Yangming disease presenting with a sensation of insects crawling on the skin, are both due to deficiency of Ying and Wei Qi (Nutritive and Defensive Qi), with slight pathogenic factors remaining in the exterior unable to be expelled. Thus, symptoms resembling insect crawling or itching occur. In all such cases, Guizhi Mahuang Geban Tang (Cinnamon Twig and Ephedra Half-Volume Decoction) is appropriate.
When Taiyang disease persists for eight or nine days, presenting like malaria with more fever than chills, no vomiting, normal bowel movements, occurring two or three times a day, and with a slightly slow and relaxed pulse, it indicates impending recovery. If the pulse is faint and there is aversion to cold, this indicates deficiency of both Yin and Yang; sweating, purging, or emesis should not be employed. If the face appears flushed, the disease has not yet resolved because slight sweating has not occurred to expel the pathogen, leading to body itching; Guizhi Mahuang Geban Tang (Cinnamon Twig and Ephedra Half-Volume Decoction) is indicated.
Yangming disease typically involves profuse sweating; if there is no sweating and the body feels as if insects are crawling in the skin, this is due to chronic deficiency. (Guizhi Mahuang Geban Tang (Cinnamon Twig and Ephedra Half-Volume Decoction) is indicated; *Ren Shu* suggests Baizhu Fuzi Tang (Atractylodes Macrocephala and Aconite Decoction) or Huangqi Jianzhong Tang (Astragalus Middle-Jian Decoction)).
Zhao stated: The sensation of insects crawling in the skin is what the classics refer to as body itching. "Chronic deficiency" here means insufficiency of Exterior Qi and lack of Jin-Ye (Body Fluids) nourishing the skin, causing dryness of the Cou-Li (interstices) and difficulty in sweating. If one argues that deficiency requires tonification, since Yangming is affected by pathogenic factors, can pathogens be treated by tonification? Using herbs like Baizhu (Atractylodis Macrocephalae Rhizoma), Fuzi (Aconiti Lateralis Radix Praeparata), and Huangqi (Astragali Radix), which are astringent and stop sweating, would cause Ying and Wei Qi to stagnate, preventing pathogen expulsion and generating internal heat. Moreover, this condition lacks signs of stomach deficiency such as vomiting or diarrhea, and the pathology is not in the interior but in the superficial deficiency of Qi in the skin. Harmonization is appropriate. It is better to borrow Guizhi Mahuang Geban Tang (Cinnamon Twig and Ephedra Half-Volume Decoction); if there is heat, Chaihu Guizhi Tang (Bupleurum and Cinnamon Twig Decoction) may be used. This sweet and pungent combination can harmonize Ying and Wei, circulate Jin-Ye (Body Fluids), and resolve the exterior. Whether this is correct remains to be seen.
Cheng Wuji stated: Chu Zhong (Elimination of the Middle) refers to a state where internal cold should prevent eating, yet the patient suddenly desires food. There are two patterns, both belonging to Jueyin Zang Cold. One pattern results from mistakenly administering cooling medicines like Huangqin Tang (Scutellaria Decoction), carrying a prognosis of certain death. The other involves less heat and more cold limbs; if Stomach Qi remains, recovery is likely, but one must fear sudden collapse of Yang followed by death, whereas sustained warmth indicates survival. This is not caused by medication.
In Shanghan (Cold Damage) with a slow pulse persisting for six or seven days, administering Huangqin Tang (Scutellaria Decoction) to clear heat is erroneous. A slow pulse indicates cold; using Huangqin Tang (Scutellaria Decoction) further removes residual heat, causing abdominal coldness and an inability to eat. If the patient suddenly eats, this is called Chu Zhong (Elimination of the Middle), indicating certain death. Symptoms include blurred vision, inability to speak, yet increased intake of food. Although the mouth attempts to speak, the tongue cannot move. In cases of cold limbs and diarrhea where eating is inappropriate, Chu Zhong (Elimination of the Middle) must be suspected. Offering Suobing (noodles) as a test: if fever ensues, it is Chu Zhong (Elimination of the Middle); if no fever occurs, it is not. (See detailed discussion in the Jueyin chapter).