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The *Zhi Fa Gang* states: The waist is the external manifestation of the Kidney, relied upon by the whole body for movement and rotation. Since all meridians pass through the Kidney and connect to the lumbar spine, once Kidney Qi becomes deficient, the waist will inevitably hurt. There are cases of lumbar pain due to Kidney deficiency, blood stasis, sprain or strain, phlegm-dampness, damp-heat, wind-cold, and qi stagnation.

The waist is the mansion of the Kidney; if it cannot rotate or sway, the Kidney is on the verge of exhaustion. Dai Shi said: Lumbar pain that persists and does not heal indicates Kidney deficiency, which should be treated by tonifying the Kidney. Pain caused by blood stasis is characterized by being lighter during the day and heavier at night; it should be treated by promoting blood circulation and regulating qi. After physical activity in summer heat, phlegm often arises, causing localized lump-like pain that worsens on cloudy days; treatment should involve drying dampness, moving qi, and resolving phlegm, allowing the phlegm to be transformed and transported with qi. Sudden twisting of the lumbar pivot resulting in inability to bend forward or backward is caused by blood stasis; herbs such as Tao Ren (Peach Kernel), Da Huang (Rhubarb Root and Rhizome), Su Mu (Sappan Wood), Dang Gui (Angelica Sinensis), and Hong Hua (Carthamus Flower) may be used. If the pain feels like needle pricks, this confirms the diagnosis. Coldness in the Kidney region like ice, yet normal diet and urination, accompanied by a sensation of heaviness in the waist as if bound by five thousand coins, should be treated with damp-resolving herbs combined with warming and dispersing agents.

It is also stated: For lumbar pain due to Kidney deficiency, the pulse must be large, the body unable to turn sideways, accompanied by fatigue, weakness, desire to lie down, and unceasing pain; Jia Wei Hu Qian Wan (Modified Tiger-Hiding Pill) should be used. For lumbar pain caused by Wind injuring the Kidney, the pulse must be floating, pain occurring alternatively on the left or right without fixed location, radiating to both legs; Du Huo Ji Sheng Tang (Notopterygium and Sangjisheng Decoction) should be used. For pain caused by Cold invasion, the pulse must be tight, alleviated by heat and aggravated by cold; Wu Ji San (Five Accumulations Powder) with Jing Jie removed and Wu Zhu Yu (Evodia Fruit) added should be used. For pain caused by qi stagnation, the pulse must be deep; Wu Yao Shun Qi San (Lindera Regulating Qi Powder) with Mu Xiang (Aucklandia Root) added may be used. Weakness and inability to straighten the waist indicate disease in the Liver and Kidney meridians; medication should be adjusted according to circumstances. Generally, lumbar pain is caused by deficiency of True Yin in the Kidney, external constraint by wind-cold, internal accumulation of damp-heat, leading to obstruction of Ying and Wei (Nutritive and Defensive Qi), thus causing pain.

The *Qian Jin Fang* states: Due to different pathogenic factors, there are five types of lumbar pain: 1. Insufficiency of Yang Qi, due to decline of Shaoyin Kidney; 2. Feng Bi (Wind Bi Syndrome), due to lingering of wind, cold, and dampness; 3. Kidney deficiency, due to overwork damaging the Kidney; 4. Trauma from falling, damaging the waist; 5. Lying on damp ground. All these arise from specific causes, and treatment must be based on syndrome differentiation.

Generally, lumbar pain should not be treated with Qi-tonifying herbs, nor with harshly cooling herbs. However, if the pain is indeed due to Qi deficiency, tonification is necessary; one simply needs to monitor and control the dosage, rather than adhering rigidly to a single theory.

Back pain caused by prolonged sitting belongs to deficiency; Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) and Ba Wu Tang (Eight Substance Decoction) are indicated. Obese people often have phlegm; those who are elderly and find relief only after being beaten by hand have conditions involving phlegm and deficiency; treatment should focus on removing dampness, resolving phlegm, and simultaneously tonifying the Spleen and Kidney. Pain after excessive drinking and eating that desires percussion indicates Spleen failure to transform and damp-heat acting up; alcohol intake must be restricted. Thin people mostly suffer from blood deficiency and Yin deficiency, often exacerbated by indulgence in alcohol and rich flavors; nourishing blood and clearing fire is essential. Additionally, heart pain occurring after constitutional weakness, illness, postpartum, or menstruation, which may radiate to the breasts and hypochondrium or travel to the back and shoulders, is due to Yuan Qi (Original Qi) rebelling upward. It should be guided back to its origin; purgative and draining methods should not be repeated, as they further deplete the body. This condition is common after sweating therapies; only warming and tonifying are appropriate. Adhering to the fallacy that "pain has no tonification method" is erroneous. Sweat is the fluid of the Heart; Yang Qi receives its energy from the chest. Excessive sweating consumes Heart fluids and depletes Yang Qi, thereby causing pain.

Ke Bozhai stated: Lumbar pain syndromes are mostly caused by Kidney deficiency. When the Kidney is deficient, the true qi of essence and blood is insufficient, allowing cold-damp pathogens to enter vacuously. Over time, stagnation occurs, and true qi battles the pathogen, causing pain. The treatment method is to first drain the pathogen, then tonify the qi. Tonifying before draining results in ineffective tonification; draining without tonifying leads to recurrence of pain because pathogens re-enter due to deficiency. Lumbar pain can also result from sprains or strains. Initially, there is stagnation; thus, draining followed by tonification is also appropriate here. Hernia pain and lumbar pain both originate from Kidney deficiency and cold-dampness. Entering from the anterior results in hernia; entering from the posterior results in lumbar pain.

Zhang Jingyue stated: Deficient syndromes account for eight or nine out of ten cases of lumbar pain. If there are no exterior pathogens and no damp-heat, but the cause is aging and labor, excess of wine and sexual activity, or emotional depression, all belong to True Yin deficiency. Signs of deficiency syndromes include a bluish-white complexion, occasionally dark/blackish; the pulse is harmonious and slow, or fine and minute; symptoms worsen with walking, standing, and exertion, and improve slightly with rest. Conditions developing gradually through accumulation are always deficiencies; sudden onset with severe pain is mostly excess. Treatment requires careful differentiation. For True Yin deficiency of Kidney Water, Dang Gui Di Huang Yin (Angelica and Rehmannia Drink), Zuo Gui Wan (Left Restoring Pill), and You Gui Wan (Right Restoring Pill) are indicated. For milder cases, less severe pain, or mild deficiency, Qing E Wan (Green Parrot Pill), Wei Shen Wan (Roasted Kidney Pill), Bu Sui Dan (Marrow-Nourishing Pill), and Tong Qi San (Moving Qi Powder) may be used.

Zhu Danxi stated: Various lumbar pains should not be treated with Ginseng to tonify Qi, nor with harshly cooling herbs. This statement is inappropriate. For cases of labor injury and deficiency where Yang is insufficient, Qi deficiency symptoms are common; why is Ginseng inadvisable? Furthermore, when Fire accumulates in the Lower Jiao, causing unbearable pain, rapid clearance of Fire is required. While it is true that for mild heat, harsh cooling is unnecessary, and for deficiency mixed with excess, Ginseng may be contraindicated, it is incorrect to generalize that cooling herbs should never be used.