（《纲目》）
【主治】灸百病。若灸诸风冷疾，入硫黄末少许，尤良（时珍）。
【发明】时珍曰∶凡灸艾火者，宜用阳燧、火珠承日，取太阳真火。其次则钻槐取火，
为良。若急卒难备，即用真麻油灯，或蜡烛火，以艾茎烧点于炷，滋润灸疮，至愈不痛也。
其戛金、击石、钻燧入木之火，皆不可用。邵子云∶火无体，因物以为体，金石之火，烈于
草木之火，是矣。八木者，松火，难瘥；柏火，伤神多汗；桑火，伤肌肉；柘火，伤气脉；
枣火，伤内吐血；橘火，伤营卫经络；榆火，伤骨失志；，竹火，伤筋损目也。《南齐书》
载武帝时，有沙门从北齐 赤火来，其火赤于常火而小，云以疗疾，贵贱争取之，灸至七炷
，多得其验。吴兴杨道庆虚疾二十年，灸之即瘥。咸称为圣火，诏禁之不止。不知此火，何
物之火也。
【附录】阳燧 时珍曰∶火镜也。以铜铸成，其面凹，摩热向日，以艾承之，则得火。
《周礼》司 氏以火燧取明火于日，是矣。
火珠 见石部水精下。
（《纲目》）
【主治】心腹冷痛，风寒湿痹，附骨阴疽，凡在筋骨隐痛者，针之，火气直达病所，甚
效（时珍）。
【发明】时珍曰∶神针火者，五月五日取东引桃枝，削为木针，如鸡子大，长五、六寸
，干之。用时以绵纸三、五层衬于患处，将针蘸麻油点着，吹灭，乘热针之。又有雷火神针
法，用熟蕲艾末一两，乳香、没药、穿山甲、硫黄、雄黄、草乌头、川乌头、桃树皮末各一
钱，麝香五分，为末，拌艾，以浓纸裁成条，铺药艾于内，紧卷如指大，长三、四寸，收贮
瓶内，埋地中七七日，取出。用时，于灯上点着，吹灭，隔纸十层，乘热针于患处，热气直
入病处，其效更速。并忌冷水。
（《本草纲目》）
【主治】艾灸可以治疗各种疾病。如果艾灸治疗各类风冷病证，加入少许硫黄粉末，效果更佳（李时珍）。
【发明】李时珍说：凡是使用艾火进行艾灸，适宜用阳燧或火珠承接日光，取得太阳的真火。其次则钻木取槐树之火，为良方。如果紧急难以准备，就使用真正的麻油灯，或者蜡烛的火，用艾茎点燃作为艾炷，滋润灸疮，直到痊愈且不疼痛为止。那些敲击金属、撞击石头、钻木入木所产生的火，都不可使用。邵雍说：火没有固定的形体，依附于物体而显现形体，金石之火，猛烈超过草木之火，确实如此。八种树木之火中，松木之火，难愈；柏木之火，伤神且多汗；桑木之火，伤肌肉；柘木之火，伤气脉；枣木之火，伤内脏导致吐血；橘木之火，伤营卫经络；榆木之火，伤骨且使人意志丧失；竹木之火，伤筋且损害眼睛。《南齐书》记载，在武帝时期，有僧人从北齐带来赤火，这种火比常火颜色更红但体积更小，声称用来治疗疾病，无论贵贱都争着求取，艾灸七炷，大多有效。吴兴人杨道庆患虚损病二十年，艾灸后即痊愈。大家都称其为圣火，皇帝下诏禁止也未能停止。不知道这火，是什么物质的火。
【附录】阳燧 李时珍说：是火镜。用铜铸造而成，其表面凹陷，摩擦发热后对着太阳，用艾草承接，就能得到火。《周礼》中司烜氏用火燧从太阳取得明火，就是指的这个。
火珠 见石部水精（水晶）之下。
（《本草纲目》）
【主治】心腹冷痛，风寒湿痹，附骨阴疽，凡是在筋骨间隐痛的病症，用针刺法配合火疗，火气直达病所，非常有效（李时珍）。
【发明】李时珍说：神针火的方法，在五月五日选取向东生长的桃枝，削成木针，如鸡蛋大小，长五、六寸，晾干。使用时用棉纸三、五层垫在患处，将针蘸取麻油点燃，吹灭，趁热用针刺激患处。又有雷火神针法，用熟蕲艾末一两，乳香、没药、穿山甲、硫黄、雄黄、草乌头、川乌头、桃树皮末各一钱，麝香五分，研为粉末，拌入艾绒，用厚纸裁成条状，将药艾铺在里面，紧紧卷成如手指粗细，长三、四寸，收存在瓶内，埋在地中七十七天，取出。使用时，在灯上点燃，吹灭，隔十层纸，趁热用针刺激患处，热气直入病处，疗效更快。并忌食冷水。
(Compendium of Materia Medica)
[Indications] Moxibustion can treat various diseases. If moxibustion is used to treat various wind-cold disorders, adding a small amount of sulfur powder yields superior results (Shizhen).
[Elucidation] Shizhen stated: When performing moxibustion with mugwort fire, it is appropriate to use a Yang Sui (bronze concave mirror for catching sunlight) or Huo Zhu (fire pearl/lens) to catch sunlight and obtain the true fire of the sun. Secondly, drilling wood to ignite locust tree fire is also good. If urgent preparation is difficult, one may use a pure sesame oil lamp or candle flame, igniting the mugwort stem as a moxa cone, keeping the moxa sore moistened until healing occurs without pain. Fires generated by striking metal, hitting stones, or drilling wood into timber should not be used. Shao Yong said: Fire has no fixed form; it takes form through objects. The fire from metals and stones is more intense than that from grasses and trees, which is correct. Among the fires of eight types of wood: pine fire makes healing difficult; cypress fire damages the spirit and causes excessive sweating; mulberry fire damages muscles; tzu wood fire damages qi and vessels; jujube fire damages the interior causing hematemesis; orange wood fire damages Ying and Wei (nutritive and defensive qi) and collaterals; elm fire damages bones and causes loss of willpower; bamboo fire damages sinews and harms the eyes. The "Book of Southern Qi" records that during the reign of Emperor Wu, a monk brought "Red Fire" from Northern Qi. This fire was redder but smaller than ordinary fire, claimed to cure illnesses, and was sought after by people of all ranks. After seven moxa cones were applied, most cases showed efficacy. Yang Daoqing from Wuxing suffered from deficiency disorders for twenty years and was cured immediately after this treatment. It was universally called "Holy Fire," and although an imperial edict forbade it, the practice could not be stopped. It is unknown what substance produces this fire.
[Appendix] Yang Sui: Shizhen stated: It is a fire mirror. Cast from copper, its surface is concave. When rubbed to generate heat and held towards the sun, holding mugwort against it yields fire. In the "Rites of Zhou," the official Si Xuan obtained bright fire from the sun using a fire drill, referring to this.
Huo Zhu: See under Crystal (Shuijing) in the Stone category.
(Compendium of Materia Medica)
[Indications] Cold pain in the heart and abdomen, Bi syndrome due to wind-cold-dampness, Yin abscesses adhering to bones, and any hidden pain in the sinews and bones. Using needle-fire therapy, the fire energy reaches the disease site directly, yielding high efficacy (Shizhen).
[Elucidation] Shizhen stated: For Shen Zhen Huo (Divine Needle Fire), on the fifth day of the fifth lunar month, select peach branches growing eastward, carve them into wooden needles, sized like a chicken egg, five to six cun long, and dry them. To use, place three to five layers of cotton paper on the affected area, dip the needle in sesame oil, ignite it, extinguish the flame, and while hot, prick the affected area. There is also the Lei Huo Shen Zhen (Thunder Divine Needle) method: take one liang of prepared Qimo mugwort powder, along with one qian each of Frankincense (Ruxiang), Myrrh (Moyao), Pangolin scales (Chuanshanjia), Sulfur (Liuhuang), Realgar (Xionghuang), Aconitum kusnezoffii root (Caowutou), Aconitum carmichaelii root (Chuanwutou), and peach bark powder, plus half a qian of Musk (Shexiang). Grind into powder, mix with mugwort, roll tightly in thick paper strips like a finger, three to four cun long, store in a bottle, and bury underground for seventy-seven days before retrieving. To use, ignite on a lamp, extinguish the flame, place ten layers of paper between the needle and skin, and while hot, prick the affected area. The heat enters the disease site directly, with even faster efficacy. Cold water must be avoided.