Numbness Deep Inside the Bones, Accompanied by Numbness in Both Flanks: When "Bone Wind" Meets "Liver String"—Deficiency or Excess, Two Distinct Paths

The same numbness—for some, it feels like fine needles lightly pricking, worsening at night; for others, it resembles ants crawling beneath the skin, becoming abruptly noticeable during emotional fluctuations. In Chinese medicine clinical practice, numbness deep within the bones and distending numbness in both flanks may both appear on the body's surface, yet the depth of pathology differs considerably. One pattern leans toward pathogenic qi lodging in the bones, characterized by deficiency of yin blood and malnourishment of the channels and vessels; the other pertains to liver qi constraint, with tension and urgency of the sinews, where qi stagnation is the root. The two are, respectively, deficiency and excess, requiring fundamentally divergent treatment strategies. If the primary and secondary aspects are not clearly distinguished, misguided care approaches may actually delay recovery. How, then, can one discern which pattern better describes one's own condition? And between bone numbness and flank numbness, might there lie a message concerning the same channel?

I. The "Positional Sense" of Numbness: Deep Bone Layers vs. Superficial Flank Surface—Distinct Pathological Sites

Numbness inside the bones is generally perceived as deeper in location, not in the skin or flesh, as if emanating from within the bone crevices. It is often accompanied by a heavy, aching sensation, and is not necessarily relieved by activity—in fact, it tends to surface more clearly during rest. Numbness in the flanks, by contrast, is frequently migratory and fluctuating in intensity, often related to emotional state, breathing, or postural changes, with no obvious tender points upon local palpation. In Chinese medicine theory, the channel affiliations of the two differ fundamentally. The bones are governed by the kidneys; the kidneys store essence and generate marrow, and when marrow is abundant, the bones are strong. The flanks are the trajectory of the liver and gallbladder channels; the liver governs free coursing and stores blood, with its channel connecting to the hypochondriac region. Bone numbness points to deficiency of kidney essence and marrow sea depletion, while flank numbness suggests stagnation of liver and gallbladder qi and blood. In clinical practice, the simultaneous occurrence of bone numbness and flank numbness often signals insufficiency of kidney water below, with failure to nourish liver wood in the middle—the so-called "water failing to nourish wood," a state of deficiency wind stirring internally. Nevertheless, further differentiation is required to determine whether kidney deficiency is the root, or liver constraint is primary, or whether phlegm-dampness and blood stasis obstructing the channels are also involved. The first step in resolving the issue is to clearly recognize the "layered sense" of the numbness—deep numbness tends toward deficiency, superficial numbness toward constraint; between deficiency and excess, clues abound.

II. Classical Textual Clues on "Bone Numbness" and "Flank Numbness" Pathomechanisms

The Huangdi Neijing · Suwen · Treatise on Bi Syndromes, Chapter 43 states: "When wind, cold, and dampness, the three qi, converge, they combine to form bi (impediment)... In cases without pain but with loss of sensation, the disease has persisted long and penetrated deeply; the movement of nutritive and defensive qi is rough, and the channels and collaterals are sometimes sparse, hence no pain; the skin is not nourished, hence loss of sensation."

The key point in this classical passage lies in the term "loss of sensation" (buren). Buren refers to numbness, which, together with pain, constitutes the primary manifestations of bi syndrome. The phrase "disease persisting long and penetrating deeply" describes the transmission process of pathogenic qi from superficial to deep: initially in the skin and flesh, manifesting as pain or soreness and distension; with prolonged malnourishment, qi and blood movement becomes rough and sluggish, the skin fails to receive nourishment and moistening, and the condition transforms into numbness. The phrase "the movement of nutritive and defensive qi is rough" is particularly crucial—the essence of numbness is local insufficiency of qi and blood supply or obstruction of their movement. Numbness deep in the bones indicates that nutritive and defensive qi struggle to reach the deepest layers; numbness between the flanks suggests that the qi of the liver and gallbladder channels is not flowing freely through that region. It should be noted, however, that the original text discusses external invasion by wind, cold, and dampness, whereas the commonly seen modern presentation of concurrent bone numbness and flank numbness is more often internal wind arising from liver-kidney deficiency, rather than simple external pathogen occlusion. External pathogen and internal injury require different treatment approaches; the method of differentiation lies in observing concomitant symptoms and triggering factors.

III. From Classics to Clinical Practice: Three Common Internal Patterns of Concurrent Bone and Flank Numbness

In clinical observation, individuals experiencing simultaneous numbness in both the bones and the flanks often do not conform to a single pathomechanism but rather present three primary internal patterns. Each pattern has its specific constitutional background and evolutionary trajectory.

1. Kidney Essence Depletion, Water Failing to Nourish Wood

This state is commonly seen in individuals with chronic sleep deprivation, excessive mental exertion, or those entering middle age and beyond. Kidney essence is insidiously consumed, the source of marrow generation is insufficient, the bones lose their nourishment, and deep numbness arises; kidney water is inadequate to nourish liver wood, liver yang becomes hyperactive, deficiency wind stirs internally, traveling upward along the channels or laterally into the flanks, thereby triggering numbness and discomfort in both hypochondria. Primary manifestations include soreness and weakness of the lower back and knees, numbness inside the bones, accompanied by tinnitus like cicadas, frequent nocturia, and memory decline; concomitant symptoms also include heel pain, loose teeth, and premature graying or hair loss—all signs of kidney essence depletion; tongue and pulse characteristics typically show a red tongue body, thin and small tongue, scant or absent coating, and a deep, thready, weak or thready and rapid pulse. The key pathomechanism lies in "water failing to nourish wood" due to kidney water insufficiency; wood qi loses its nourishment and stirs, generating wind, and wind is characterized by swift movement and frequent change, most prone to darting between the bones and fasciae.

2. Liver Blood Insufficiency, Blood Deficiency Generating Wind

This state is commonly seen in women after menstruation, during the postpartum recovery phase, or in individuals with chronic blood loss or spleen-stomach weakness. The liver stores blood, and blood nourishes the sinews; when liver blood is insufficient, the sinews and vessels lose moisture and nourishment, become tense and constricted, and numbness appears. The flanks are the passage of the liver channel; when blood deficiency fails to soften and nourish, the hypochondriac region may develop numbness and tightness. In this pattern, bone numbness does not indicate a problem with the bones themselves, but rather blood deficiency failing to nourish the entire body, including the blood vessels in the deep bone layers. Primary manifestations include limb numbness and dull numbness in the flanks, aggravated by fatigue and relieved by rest; concomitant symptoms include a sallow complexion, dizziness and blurred vision, lusterless nails, and dry skin; tongue and pulse characteristics show a pale tongue body with thin white coating, and a wiry, thready, or thready and weak pulse. The key pathomechanism lies in "blood deficiency generating wind"; the root of wind is not external pathogens but rather scantiness of nutritive blood and emptiness of the collateral vessels.

3. Liver Constraint with Qi Stagnation, Phlegm-Stasis Obstructing the Collaterals

The third pattern presents with an excess facies, commonly seen in individuals with chronic mental tension, unmet emotional needs, or prolonged sitting with minimal movement. Liver qi becomes constrained, the qi mechanism is not smooth, fluids congeal into phlegm, and blood movement slows into stasis; phlegm and stasis bind together, traveling along the liver channel to harass the flanks, resulting in flank numbness. The appearance of bone numbness is related to prolonged qi and blood stagnation, with obstruction of the collateral vessels surrounding the bones. Primary manifestations include distending numbness in both flanks, migratory and unfixed in location, relieved after belching or passing flatus; concomitant symptoms include a feeling of fullness and discomfort in the chest and hypochondrium, a sensation of a foreign body in the throat, and noticeable symptom fluctuation with emotional changes; tongue and pulse characteristics show a somewhat dark tongue body, possibly with ecchymotic spots, a white greasy or slightly yellow greasy coating, and a wiry, slippery or wiry, rough pulse. The key pathomechanism is qi stagnation as the initiating factor, with phlegm and stasis as secondary developments, and collateral obstruction as the final outcome—the essential difference from the two deficiency-type patterns above lies in "obstruction" rather than "malnourishment."

IV. The Severity and Urgency of Bone Numbness and Flank Numbness: How to Assess the Current Stage

When faced with two types of numbness, some people ask, "Is this serious?" while others urgently seek "how to eliminate it." From a Chinese medicine perspective, what deserves greater attention is not the symptom itself but the underlying trajectory. Bone numbness involves kidney essence and the marrow sea, representing a deeper level; flank numbness involves liver and gallbladder free coursing, representing a relatively more superficial level. When both appear simultaneously, the sequence of onset, lateral emphasis, and triggering factors all serve as evidence for assessing disease progression. Cases that worsen at night and lessen during the day are mostly yin deficiency with blood depletion; cases that are pronounced in the morning and resolve with activity are mostly related to qi stagnation and phlegm-dampness; flank numbness predominant on the left side often indicates blood-level involvement; flank numbness predominant on the right side frequently suggests qi-level issues. These subtle distinctions form the foundation of "treating the same disease with different methods" in Chinese medicine pattern differentiation. It is important to note that if bone numbness progressively worsens and is accompanied by limb weakness, unsteady gait, or severe chest and flank pain, one should not simply observe from a Chinese medicine care perspective but should promptly seek evaluation at a formal medical institution to rule out organic pathology before discussing restorative approaches. The value of popular science lies in providing a perspective for understanding the body, not in replacing modern medical diagnostic procedures.

V. Four Dimensions of Daily Care: Diet, Routine, Emotions, and Daoyin

1. Dietary Recommendations: Nourish Rather Than Tonify, Course Rather Than Attack

For deficiency-type bone and flank numbness, regular diet should not blindly adopt warming tonics or casually purge. Ingredients that nourish kidney yin—such as black sesame, mulberry fruit, and wolfberry—can be incorporated in moderate amounts as part of the daily diet; ingredients that soften the liver and nourish blood—such as red dates, dried longan pulp, and pork liver—are likewise suitable as supplementary choices. For excess-type qi stagnation with phlegm-stasis, a light diet is appropriate, reducing rich, fatty, sweet, raw, cold, and sticky foods while appropriately increasing qi-regulating and phlegm-resolving ingredients such as tangerine peel, radish, and hawthorn. It should be noted that any selection of foods should be flexibly adjusted according to individual constitution and current season, rather than rigidly applied. Eating slowly and chewing thoroughly, allowing the spleen and stomach to transport and transform with ease, is itself a primary step in nourishing qi and blood.

2. Sleep and Daily Rhythm: Align with the Zi and Wu Periods, Conserve Essence and Accumulate Vigor

The restoration of kidney essence depends on adequate sleep, especially during the midnight zi period (11 PM to 1 AM), which is the critical moment when yang qi is stored deep and yin essence is nurtured. Chronic sleep deprivation is equivalent to forcibly overdrawing kidney essence precisely when it most needs to accumulate. For those experiencing numbness inside the bones, adjusting sleep patterns is no less significant than any dietary protocol. It is recommended to put down electronic devices earlier in the evening and create a quiet, dim sleeping environment; a brief midday rest may also benefit the movement of liver and gallbladder channel qi. Once sleep quality improves, the morning heaviness and the tight sensation in the flanks typically ease—a natural response of the body's self-regulation of qi and blood.

3. Emotional Regulation: Free Coursing in Moderation, Neither Suppressed nor Angry

The liver governs free coursing, delights in expansiveness, and abhors depression. Prolonged emotional suppression, excessive rumination, and a tendency toward irritability all impair the normal movement of liver qi, exacerbating qi stagnation in the flank region. Chinese medicine emotional theory holds that "anger injures the liver" not only refers to anger itself but also encompasses chronic emotional tension that finds no release. In daily life, it is worthwhile to cultivate hobbies that genuinely allow relaxation—such as listening to music, tending to plants, or conversing with friends. When emotions surge, consciously take several deep breaths to allow the qi mechanism to descend naturally. There is no need to demand constant equanimity, but at the very least, provide emotions an outlet for expression and transformation.

4. Exercise and Daoyin: Gentle Circulation, Without Reckless Consumption of True Qi

For individuals with bone and flank numbness, strenuous exercise is not the ideal choice. Profuse sweating further consumes yin blood and qi fluids, which is counterproductive to nourishing the sinews and bones. More gentle daoyin-type exercises—such as tai chi, baduanjin, and walking—are conducive to qi and blood movement and channel patency. The ideal state during activity is a slight warmth of the body without feeling fatigued. It should be clarified that the specific details and frequency of daoyin movements should be determined by a licensed Chinese medicine practitioner or professional instructor based on individual constitution; this article serves only as directional reference. The value of exercise lies in gradual progression and consistent persistence, far more beneficial than a single session of high-intensity sweating.

VI. From "Bones and Flanks" to a Holistic Perspective: The Body's Integrated Resonance

The concurrent appearance of bone numbness and flank numbness, in a sense, is the body using a distinctive means to remind us: between the kidneys and liver, between essence and blood, between qi and fluids, a certain degree of imbalance exists. Chinese medicine never views a symptom in isolation but regards symptoms as signals of an overall state. The bones and the flanks—one belonging to the deep supportive system, the other to the middle-level coursing and draining system—when both are numb simultaneously, suggest not two independent threads but rather the reflection of one internal environmental imbalance manifesting at different levels. When kidney essence is insufficient, liver wood loses its nourishment; whether liver qi is free-flowing, in turn, affects the irrigation of the bones by qi and blood. This interdependent relationship is summarized in Chinese medicine theory as "yi and gui sharing the same source"—the liver corresponds to yi wood, the kidneys to gui water; water generates wood, and the two share weal and woe. The direction of nurturing need not deliberately pursue some remarkable method but should return to the most elemental level: give the body adequate sleep, appropriate food, flowing emotions, and gentle activity. When the imbalance of the overall environment is corrected, the localized numbness naturally has the opportunity to fade. Have you ever considered that the numbness in the bones and flanks might not be two separate matters? It may be the same sigh emitted by a body already deficient in essence and blood, now burdened with an excess of emotional weight.

References:

1. The original text of the Huangdi Neijing · Suwen can be consulted in the Traditional Chinese Medicine Ancient Texts Database: https://tcmdata.cintcm.com/

2. World Health Organization strategic document on traditional medicine: https://www.who.int/health-topics/traditional-complementary-and-integrative-medicine

3. Official website of the National Administration of Traditional Chinese Medicine: https://www.satcm.gov.cn/

Numbness deep within the bones accompanied by distending numbness in both flanks—is this a signal of kidney essence depletion with water failing to nourish wood, or the excess pattern of liver constraint with qi stagnation and phlegm-stasis obstructing the collaterals? Beginning with the discussion of "loss of sensation" (buren) in the Huangdi Neijing, this article deconstructs the pathological site differences between deep and superficial numbness, distinguishes the clinical features of deficiency wind and excess stagnation, and offers directional daily care recommendations across four dimensions: diet, routine, emotions, and daoyin. Facing the body's same sigh, first distinguish deficiency from excess—then discuss nurturing.

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