风虚腰痛者，肾虚而风冷乘之也，其尺脉虚浮而痛多抽掣，或拘急且酸，而上连脊背，
不时速治，喜流入脚膝，为偏枯冷痹缓弱之疾。
独活寄生汤
独活（三两） 细辛 牛膝 桑寄生 秦艽 茯苓 白芍 人参 熟地黄 防风 杜仲
川芎 当归（各二两） 桂心 甘草
每服五钱，水煎空心服。
甘豆汤（《直指》） 治肾虚内蓄风热，腰痛，或大小便不通。
生甘草（二钱） 黑大豆（二合）
加生姜七片，水煎服。
治肾脏风，攻注脚膝痛。
连珠甘遂（一两） 木鳖子（一个雄，一个雌，去壳）
上为末， 猪腰子二个，破开，药末一钱掺匀，湿纸裹数重，慢火煨熟放温，五更初细
米饮下。如积多则利多，少则少也。宜软饭将息。若患一脚，却看左右。如左脚用左边腰子
，右用右边者，药末止一钱。壬子年在毗陵，有马姓人鬻酒，久不见，因询其亲，云∶宿患
肾脏风，今一足发肿如瓠，自腰以下，巨细通为一律，痛不可忍，卧欲转侧，必两人挟持方
可动，或者欲以铍刀决之。予曰∶未可，予有药当合以赠，如上法服之，辰巳间下脓如水晶
者数升，实时痛止肿退，一月拄拐而行。予再以赤乌散，充涂贴其膝方愈。后十年过毗陵，
率其子列拜以谢云∶向年脚疾，至今不复作，虽积年肾脏风，并已失去，今健步自若矣。
经云∶邪之所凑，其气必虚，留而不去，其病则实。若不决而去之，而欲以补药攻疾，
非徒无效而已也。余读《本事方》，有取乎此，故备录如上。
风虚腰痛，是由于肾气亏虚，风寒湿邪乘虚侵袭所致。其脉象表现为尺部脉虚浮，疼痛多伴有抽掣感，或者拘挛急迫且酸楚，痛势向上牵连脊背。若不及时治疗，病邪容易下行流入脚膝，导致偏枯、冷痹、肢体缓弱等病症。
独活寄生汤
组成：独活（三两）、细辛、牛膝、桑寄生、秦艽、茯苓、白芍、人参、熟地黄、防风、杜仲、川芎、当归（各二两）、桂心、甘草。
用法：每次服用五钱，用水煎煮，空腹服用。
甘豆汤（出自《直指方》）：治疗肾虚体内蓄积风热引起的腰痛，或大小便不通畅。
组成：生甘草（二钱）、黑大豆（二合）。
用法：加生姜七片，用水煎服。
此方亦治肾脏风邪，攻注于脚膝引起的疼痛。
组成：连珠甘遂（一两）、木鳖子（一个雄性，一个雌性，去壳）。
制法与用法：将上述药物研为细末。取猪腰子二个，剖开，将药末一钱均匀撒在腰子上，用湿纸多层包裹，以慢火煨熟，待温度适宜时，在五更天（凌晨3-5点）用稀米汤送服。如果体内积滞多，则腹泻次数多；积滞少，则腹泻少。服药后宜食用软饭调养。如果只有一只脚患病，则根据左右对应原则选择腰子。如左脚患病用左侧腰子，右脚患病用右侧腰子，此时药末仅需一钱。
医案：壬子年在毗陵，有一位姓马的卖酒人，许久未见，于是询问他的亲友，得知他旧患肾脏风，如今一只脚肿胀得像葫芦一样，从腰部以下，粗细完全一致，疼痛难以忍受，想翻身侧卧，必须两个人搀扶才能移动，有人建议用铍刀切开排脓。我说：“现在不可以，我有药应当配制赠送给他，按照上述方法服用。”结果在辰巳时（上午7-11点）排出像水晶一样的脓液数升，顿时疼痛停止，肿胀消退，一个月后拄着拐杖行走。我又让他使用赤乌散涂抹贴敷膝盖，最终痊愈。十年后经过毗陵，他带着儿子列队拜谢说：“当年的脚疾，至今不再发作，虽然是多年的肾脏风，也已经彻底治愈，现在步履矫健自如了。”
经文说：“邪气聚集的地方，正气必然虚弱；邪气停留不去，病势就会转为实证。”如果不果断祛除邪气，而想用补药来攻治病邪，不仅无效，反而有害。我读《本事方》，对此深有体会，所以详细记录如上。
Lumbar pain due to wind deficiency arises from kidney deficiency where wind-cold pathogens take advantage of the weakness. The pulse at the chi position (尺脉, distal radial pulse reflecting kidney status) is deficient and floating, with pain often accompanied by twitching or cramping sensations, stiffness, and soreness, radiating upward to connect with the spine and back. If not treated promptly, the pathogen tends to flow downward into the feet and knees, causing conditions such as hemiplegia (偏枯), cold bi syndrome (cold obstruction syndrome), and limb flaccidity and weakness.
Duhuo Jisheng Decoction (Sanguisorba and Taxillus Decoction)
Ingredients: Radix Angelicae Pubescentis (Duhuo, 3 liang), Radix Asari (Xixin), Radix Achyranthis Bidentatae (Niuxi), Ramulus Taxilli (Sangjisheng), Herba Gentianae Macrophyllae (Qinjiao), Poria (Fuling), Radix Paeoniae Alba (Baishao), Radix Ginseng (Renshen), Radix Rehmanniae Preparata (Shudihuang), Radix Saposhnikoviae (Fangfeng), Cortex Eucommiae (Duzhong), Radix Chuanxiong (Chuanxiong), Radix Angelicae Sinensis (Danggui) (each 2 liang), Cortex Cinnamomi (Guixin), Radix Glycyrrhizae (Gancao).
Administration: Take 5 qian per dose, decoct in water, and consume on an empty stomach.
Gandou Tang (Black Soybean Decoction) (from *Zhizhi Fang*): Treats lumbar pain caused by internal accumulation of wind-heat due to kidney deficiency, or difficulty in urination and defecation.
Ingredients: Raw Radix Glycyrrhizae (Sheng Gancao, 2 qian), Black Soybeans (Hei Da Dou, 2 he).
Administration: Add 7 slices of fresh ginger, decoct in water, and drink.
This formula also treats wind pathogens affecting the kidneys that attack and cause pain in the feet and knees.
Ingredients: Lianzhu Kansui (Conjoined Kansui Root, 1 liang), Semen Momordicae (Mubiezi, one male and one female, shell removed).
Preparation and Administration: Grind the above herbs into powder. Take two pig kidneys, slice them open, sprinkle 1 qian of the herb powder evenly inside, wrap tightly in several layers of wet paper, and slow-roast until cooked. Allow to cool to a warm temperature. Ingest early in the morning (around 3-5 AM) with thin rice gruel. If there is much accumulation, there will be more diarrhea; if less accumulation, less diarrhea. Consume soft rice for dietary care after taking the medicine. If only one foot is affected, choose the corresponding side: use the left kidney for the left foot, and the right kidney for the right foot. In this case, use only 1 qian of herb powder.
Case Record: In the year Renzi, in Piling, I met a wine seller surnamed Ma whom I had not seen for a long time. I asked his relatives about him and learned that he suffered from chronic kidney wind. Now, one leg was swollen like a gourd, uniform in thickness from the waist down. The pain was unbearable; turning over required two people to support him. Some suggested incising it with a scalpel (beidao). I said, "Not yet. I have a prescription to prepare and give you. Follow the method above." By the Chen-Si hours (7-11 AM), he excreted several sheng of pus resembling crystal. Immediately, the pain ceased and the swelling subsided. Within a month, he could walk with a cane. I then advised him to apply Chiwu San (Red Bird Powder) to his knee, which led to complete recovery. Ten years later, passing through Piling again, he bowed with his son to express gratitude, saying, "The foot ailment from those years has never recurred. Although I suffered from chronic kidney wind for many years, it has now completely disappeared, and I walk vigorously and naturally."
The Classic states: "Where evil gathers, qi must be deficient; if it remains and does not depart, the disease becomes excess." If one does not decisively eliminate the pathogen but instead attempts to treat the disease with tonifying medicines, it will not only be ineffective but potentially harmful. Having read *Ben Shi Fang*, I found value in this approach, so I have recorded it in detail above.