I. Starting with the "Sinew": Why Do Deep Bone Cavities and the Superficial Skin "Twitch" Simultaneously?
Many patients who come to my clinic ask me a common question: spinal pain and skin pain—one deep and one superficial—how can they occur at the same time? The sensation they describe is quite distinctive—as if something is tugging on them, with a twitching, pulling pain that sometimes shoots outward from the crevices between the vertebrae in the middle of the back, and other times wanders unpredictably across the surface of the skin.
In Chinese medicine theory, this kind of "twitching pain" has a very precise explanation: the Liver governs the sinews and fascia of the body. The vertebral bones are connected to each other by sinews, and beneath the skin lies an intricate network of fine fascia. When the fascial system as a whole develops problems, pain can climb like vines, attaching itself simultaneously at the level of both bone and skin, manifesting a phenomenon of "pulling one strand and moving the whole body."
The Huangdi Neijing: Suwen, Chapter 44, Treatise on Atrophy states: "The Liver governs the sinews and fascia of the body." These seemingly simple words reveal the crux of the matter—fascia spreads throughout the entire body, from the deep periosteum to the superficial subcutaneous tissue, forming one continuous network. When the spine and the skin twitch painfully at the same time, it often means that this network is simultaneously "contracting," merely presenting different sensations in different locations.
In terms of disease location, the spine belongs to Bone, which is governed by the Kidneys; the skin belongs to the Exterior, governed by the Lungs; and the sinews connecting bone and skin belong to the Liver. The single character "twitch" (chou, 抽) points to the nature of Wind—Wind is characterized by movement, is good at traveling, and changes frequently. Many people's twitching pain comes suddenly and leaves just as quickly, and its location shifts—this is precisely a depiction of Wind pathogen wandering among the sinews and vessels.
Analyzed in terms of disease nature, the root of twitching pain lies in "malnourishment of the sinews and vessels." This is like a rubber band: when moist, it is soft and elastic; when dried out for a long time, it becomes hard and brittle, making cracking sounds at the slightest stretch. The "nourishment" of the fascia comes from the moistening of Liver blood and the replenishment of Kidney essence. When these two are insufficient, the fascia begins to "twitch dry."
In terms of disease tendency, this type of pain tends to be paroxysmal and closely related to fatigue and emotional fluctuations. Clinically, simultaneous twitching pain in the spine and skin is most commonly seen in people with deficiency of yin blood and malnourishment of sinews and vessels, and can also be seen in those with cold congealing in the meridians or impeded qi and blood flow. The difference is this: in the former, "pain due to lack of nourishment," where pain arises from a deficiency of sustenance; in the latter, "pain due to blockage," where pain arises from obstructed pathways.
II. Twitching Pain in Three Constitutional Types: Same Appearance, Different Origins
Constitution A: Deficiency of Yin Blood with Malnourished Sinews and Fascia
This constitution is the most common clinically. Its twitching pain is characterized by worsening at night and becoming more pronounced during quiet rest. During the day, when one is busy, qi and blood can still barely reach the extremities; at night, when yang qi withdraws inward, the deficiency of yin blood becomes fully exposed. The skin tends to appear dry, sometimes with fine scaling and peeling. The muscles on both sides of the spine feel tight and taut but yield no clear tender points upon palpation.
Apart from the twitching pain, such individuals often experience dry eyes, blurred vision, a dull complexion, lusterless nails, and light sleep with easy waking. The tongue manifestation typically shows a pale or slightly red tongue body, a thin tongue body, and scant or peeled coating. The pulse is mainly thin and wiry, and may feel weak on deep pressure.
The Jingui Yaolue, Chapter Six: Blood Impediment and Consumptive Disease—Pulse, Patterns and Treatment states: "Those who lose essence have tension and urgency in the lower abdomen, cold genitals, dizziness, and hair loss." Although the "essence-losers" mentioned here refer to those who lose semen, the two characters "xuan ji" (弦急, wiry and tense) precisely depict the taut, constricted state of sinews after losing nourishment. Yin blood is the "lubricating oil" that moistens the sinews. When this reserve is progressively depleted, the sinews become like a riverbed after prolonged drought—dried up, cracked, and twitching.
Where is the key pathological mechanism? It lies in the interweaving of Liver blood deficiency and Kidney essence depletion. The Liver stores blood, the Kidneys store essence, and essence and blood mutually generate each other. Long-term sleep deprivation, excessive rumination, and overuse of the eyes continuously consume the reserve of yin blood. The spine is the surplus of bone and is governed by the Kidneys; the skin is the surplus of blood and is nourished by the Liver. The simultaneous twitching of both precisely indicates that the depletion of essence and blood has penetrated to the very terminal ends of bone and skin.
For such individuals, the direction of care is to nourish yin blood. In the daily diet, blood-nourishing and moisture-moistening foods can be appropriately added, such as mulberries, black sesame, goji berries, and longan pulp. However, it must be noted that "nourishing yin" is not a case of "the more the better"—for people with weak spleen and stomach transport capacity, overly rich and greasy products may instead cause stagnation in the middle burner. It is necessary for a licensed TCM practitioner to judge suitability based on tongue coating and pulse findings.
Constitution B: Cold Congealing in the Meridians with Qi and Blood Obstruction
Another common type of twitching pain follows precisely the opposite route. In this constitution, the pain has one remarkable feature: it worsens with cold and lessens with warmth. When the weather turns cool, after exposure to cold wind, or upon touching cold water, the twitching pain arrives as expected. The pain is more intense—sometimes like needle pricks, sometimes like a sudden contraction after being doused with ice water.
In addition to the twitching pain, such individuals often have cold extremities, aversion to cold, loose stools, and profuse clear urine. After exposure to cold, the spinal area feels stiff, as if the back is bound by something, making turning inconvenient. The skin surface may show no obvious rashes or lesions, but there is a sensation of repeated "goosebump-like" contractions, and even the body hair may stand on end.
On the tongue, the body is pale with a white, moist or white-greasy coating. The pulse presents tight, deep, or wiry-tight characteristics. In terms of pathogenesis, this belongs to cold pathogen lodging in the meridians. "Cold governs contraction and cold governs pain." Cold constricts and narrows the passageways through which qi and blood move. Blood flow becomes impeded, the fascia lacks warmth, and naturally it begins to "twitch."
The Suwen, Chapter 39: On Pain explains it clearly: "When cold qi lodges outside the vessels, the vessels become cold; when the vessels are cold, they contract and curl; when contracted and curled, the vessels become tense and constricted; when tense and constricted, they pull on the fine collateral vessels externally, hence sudden pain." The principle of pain caused by cold pathogen is that the vessels "curl up" and become "tense and constricted"—shrinking and cramping. Both the crevices between the spinal bones and the interstices of the skin are places where cold pathogen readily lodges, so it is not difficult to understand why twitching pain occurs simultaneously in both locations.
In the Shanghan Lun, Chapter on the Differentiation of Taiyang Disease Pulse, Patterns and Treatment, the Mahuang Tang pattern describes "body pain, low back pain, and bone and joint pain" precisely as cold pathogen blocking the taiyang channel. Taiyang governs the exterior of the entire body and commands the nutritive and defensive qi. When cold pathogen attacks the exterior, the movement of nutritive and defensive qi is impeded, manifesting as simultaneous pain in the body surface and the bones.
The care direction for this constitution is diametrically opposite to that of yin blood deficiency: it requires warming and unblocking rather than moistening. In daily life, mildly warming condiments such as fresh ginger, cinnamon bark, and fennel seeds may be appropriately consumed. However, these foods also must be used according to pattern discrimination—for a person with a heat constitution, further warming is like adding fuel to a fire and will instead damage yin fluids.
Constitution C: Mixed Cold and Heat with Both Deficiency and Excess
There is also a constitution that cannot be overlooked, in which the twitching pain vacillates between the previous two patterns. Sometimes the skin feels hot, itchy, with a sensation like ants crawling; at other times, the deep spine feels cold and sore, as if a piece of ice is hidden within the bone crevices. Such people are the most confusing—if warming and unblocking methods are used, the skin heat signs intensify; if cooling and moistening methods are used, the spinal cold sensation becomes more pronounced.
This constitution is more common among those with long-term disordered schedules and irregular diet, often accompanied by marked emotional fluctuations, dry mouth with bitter taste, and abdominal distension. The tongue may show a red tip with a white-greasy root coating, or ecchymotic spots on both edges of the tongue. The pulse may be floating at the inch position and deep at the guan and chi positions, forming a pattern of heat above and cold below, with disharmony between the interior and exterior.
The Shanghan Lun, Chapter on the Differentiation of Jueyin Disease Pulse, Patterns and Treatment describes the characteristics of Jueyin disease: "Jueyin disease manifests as wasting thirst, qi rushing upward to the heart, heat and pain in the heart region, and hunger without desire to eat." On the surface, this passage speaks of the contradiction between wasting thirst and hunger, but at its root it reveals the pathological state of mixed cold and heat. When the body is in such a "chaotic" condition, the fascial system neither receives sufficient nourishment nor has smooth flow of qi and blood, and the twitching pain in the spine and skin manifests in complex and ever-changing forms.
The difficulty in regulating this constitution is that one cannot simply "tonify" or "unblock," but must harmonize yin and yang and coordinate the movement of qi. Suitable foods tend to be neutral and mild items, such as Chinese yam, Poria, tangerine peel, and Buddha's hand citron—these both strengthen the spleen and harmonize the middle, without being overly warming or cooling. How to adjust specifically requires comprehensive evaluation of tongue and pulse manifestations. It is recommended to consult a licensed TCM practitioner and choose suitable dietary and lifestyle approaches under professional guidance.
III. Why the Same Problem Requires Completely Different Approaches—The Essence of "Same Disease, Different Treatments"
Faced with the three constitutions above, many people may wonder: since the symptoms are all twitching pain in the spine and skin, why are the health-preservation directions so vastly different? This is precisely the essence of the TCM principle "same disease, different treatments"—when the disease name is the same but the patterns differ, the treatment and regulation methods should naturally differ.
Constitution A needs to "add water"—like a flowerpot with cracked dry soil, it needs watering rather than loosening. When yin blood is replenished, the fascia receives moisture and the twitching naturally subsides. Constitution B needs to "add warmth"—like a water pipe that has frozen, it needs hot water to flow through rather than more water poured in. When cold qi disperses, the meridians unblock, and the pain naturally resolves. Constitution C needs to "dredge"—like a blocked river where there is flooding upstream and drought downstream: neither storing water upstream nor dredging mud downstream alone will solve the problem; the blockage in the middle reaches must be cleared.
The Suwen, Chapter 74, Treatise on the Essential Principles of the Great Treatise provides a concise methodological summary: "Carefully adhere to the disease mechanism, and trace each to its proper category. Where there is [pathogen], seek it; where there is none, seek it. For excess, hold it accountable; for deficiency, hold it accountable." This means that one must carefully examine the crux of the disease, and whether there is pathogen or not, whether it is excess or deficiency, one must find the root of the problem rather than being misled by superficial symptoms.
Another important dimension of judgment is distinguishing whether the pattern is "predominantly deficiency" or "predominantly excess." In predominantly deficiency patterns, the twitching pain is mostly dull, lingering, and unremitting, with dry skin and a dull complexion, a pale tongue and thin pulse—the appropriate approach is gentle, slow tonification and nourishment. In predominantly excess patterns, the twitching pain is mostly severe and urgent, worsens with cold, with tightened skin and cold extremities, a pale tongue with white coating and a tight pulse—the appropriate approach is warming, unblocking, and dispersing cold.
Attention should also be paid to temporal patterns. TCM theory holds that the circulation of qi and blood in the human body follows the twelve two-hour periods (shichen) with different emphases. If the twitching pain in the spine and skin frequently occurs between Zi (11 PM–1 AM) and Chou (1 AM–3 AM), it is often related to the qi and blood state of the Liver and Gallbladder channels. If it is pronounced in the early morning between Yin (3 AM–5 AM) and Mao (5 AM–7 AM), it may involve the qi transition between the Lung and Large Intestine channels. Such temporal patterns can provide valuable reference clues for pattern differentiation.
The Lingshu, Chapter 47, Original Benign Constitution puts it penetratingly: "Therefore, when blood is harmonious, the channels and vessels flow; the nutritive and defensive qi circulate to yin and yang; the sinews and bones are strong and powerful; and the joints remain clear and agile." When qi and blood are in harmony and the channels and vessels are unobstructed, the sinews and bones are naturally strong, and the joints move flexibly and freely. This statement vividly portrays the fundamental state of health—harmony of blood, patency of vessels, and coordination of nutritive and defensive qi are the fundamental directions for resolving all fascial problems.
From clinical regularities, regardless of constitution, the simultaneous twitching pain of spine and skin indicates that consumption exceeds replenishment, or obstruction exceeds flow. For those who sit for prolonged periods and move little, the circulation of qi and blood in the lower back is slow, and the fascia tends to "stiffen." For those who overthink, yin blood is insidiously consumed, and the fascia tends to "dry." For those who crave cold drinks and cold foods, cold qi settles within, and the fascia tends to "contract." Three states correspond to three entirely different physical and mental environments.
It must be clearly stated here: TCM constitution identification is not simply a matter of "fitting oneself into a box." Many people's constitutions are not a single pure type but rather a mixture of multiple tendencies to varying degrees. For this very reason, TCM emphasizes "individualized regulation according to the person"—the same food may produce completely opposite effects in people of different constitutions. To accurately determine one's own constitution tendency, it is necessary to undergo comprehensive assessment through the four diagnostic methods, and if needed, consult a licensed TCM practitioner at a formal medical institution.
IV. The Underlying Logic of Care: Giving the Body a Reason Not to "Twitch"
Once one understands the differences in pathological mechanisms behind different constitutions, the direction of health preservation acquires a clear coordinate system. Regardless of which type one belongs to, the following points of care can serve as reference, though specific implementation still requires individualized consideration.
In terms of diet, different constitutions have entirely different appropriate and contraindicated foods. For those with yin blood deficiency, foods that nourish yin and moisten dryness, such as mulberries, black sesame, and goji berries, may be appropriately consumed. For those with cold congealing in the meridians, warming foods such as fresh ginger and cinnamon bark are suitable. For those with mixed cold and heat, neutral tonics such as Chinese yam and Poria are appropriate. Eating according to pattern discrimination is the true essence of TCM dietary health preservation.
The Suwen, Chapter 3, Treatise on the Communication of Qi with Heaven offers an extremely important statement: "Yang qi, when refined, nourishes the spirit; when softened, nourishes the sinews." When yang qi is sufficient, the spirit is vibrant and the sinews and fascia are soft and elastic. This passage reveals the value of "softness"—the normal state of fascia should be pliable, not rigid. When yang qi is replete, sinews are supple and bones are aligned; when yang qi is deficient or stagnant, the fascia loses its pliability and manifests "twitching."
In terms of daily rhythms, sleep is the most direct way to nourish yin blood. During deep sleep at night, Liver blood is able to return to storage and Kidney essence is replenished. Those who stay up late for prolonged periods are essentially continuously overdrafting the body's "blood bank." Even if they supplement with abundant nutrition during the day, it cannot compensate for the loss caused by failing to store what should be stored at night.
With regard to emotional regulation, "the Liver governs the sinews" also implies that emotional fluctuations directly affect the state of the fascia. When one remains in a state of prolonged tension, anxiety, or irritability, Liver qi becomes constrained, and the fascial system remains like a bowstring pulled taut at all times, unable to relax. Learning to let go, accepting imperfection, and giving emotions an outlet are of great significance for alleviating twitching pain.
Traditional guiding exercises, such as Baduanjin (Eight Pieces of Brocade) and Wuqinxi (Five Animal Frolics), stretch the fascia in a gentle manner and promote the flow of qi and blood. Such exercises are particularly suitable for people suffering from twitching pain in the spine and skin. However, it should be noted that the principle during practice is relaxed and comfortable stretching; excessive stretching or forceful effort should be avoided, so as not to further damage the sinews and vessels. Whether a particular guiding exercise or training method is suitable should be determined by a licensed TCM practitioner based on individual constitution.
The Wenbing Tiaobian, Miscellaneous Discourses, Treatise on Sweating states: "Sweat is produced by the steaming and transformation of yang qi and yin essence." The normal excretion of sweat requires the propulsion of yang qi and the sufficiency of yin essence as a foundation. Sweating too much or too little both indicate an imbalance of yin and yang. For those with twitching pain, a light sweat is sufficient; profuse, dripping sweat will further consume qi and blood.
Clinically, simultaneous twitching pain in the spine and skin is not an isolated symptom but rather resembles a signal sent by the body—reminding you to pay attention to those neglected forms of consumption: staying up late, anxiety, overwork, and craving cold. In a peculiar way, it connects the "deep bone" and the "superficial skin"—two seemingly unrelated things—and makes one realize that the body operates as a whole.
Each time the twitching pain occurs, it is worth observing one's own body state: Is it due to insufficient rest? Mental tension? Exposure to wind-cold? Or improper diet? This kind of self-awareness is not meant to replace a physician's diagnosis, but to help you understand your body more clearly. When you begin to notice these patterns, you will also find the language to converse with your body.
Have you ever considered that the simultaneous twitching pain in the spine and skin may not be two separate problems, but rather the body using a single "sinew" to connect the deep and the superficial, sending you a unified signal? Those neglected forms of consumption and fatigue are now, in a faint, tugging manner, emerging simultaneously from the crevices of the bones and beneath the skin, reminding you that it is time to rest.
References:
1. The original text of Huangdi Neijing: Suwen can be consulted in the TCM Ancient Literature Database: https://tcmdata.cintcm.com/
2. WHO strategy 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/
4. The original texts of Shanghan Lun, Jingui Yaolue, and Wenbing Tiaobian can be consulted in the TCM Ancient Literature Database: https://tcmdata.cintcm.com/
Related Q&A
I. What causes the condition described in "Starting with the Sinew"?
In TCM, the condition described in "Starting with the Sinew" must be analyzed through holistic pattern differentiation, using the four diagnostic methods (inspection, auscultation-olfaction, inquiry, and palpation) in combination with individual constitutional characteristics to reach a comprehensive judgment; it cannot be reduced to a single cause. The specific direction of regulation should be determined by a licensed TCM practitioner after an in-person consultation.
II. How long is the treatment course for twitching pain in the three constitution types?
The treatment course varies from person to person and is related to factors such as the individual's constitutional foundation and compliance with lifestyle recommendations. TCM emphasizes gradual progress. The specific course should be assessed by a licensed TCM practitioner based on the individual's circumstances after an in-person consultation; this material does not provide any commitment to a specific duration.
III. Why does the same problem require different daily precautions?
For daily care, it is recommended to maintain a regular daily schedule, a balanced diet, moderate exercise, and emotional stability. Specific precautions should be flexibly adjusted according to individual constitution and seasonal changes. You may consult a licensed TCM practitioner for targeted recommendations.