Among the older generation, there is a plain saying that has been passed down: "When a person ages, the feet decline first; when a tree withers, the roots fail first." Elderly people in the fields and at the alley entrances, cooling themselves, often use this saying to remind the younger generation to pay attention to changes in the feet. Thinking about it carefully today, this folk saying aligns remarkably well with traditional Chinese medicine's understanding of the feet—the dorsum of the foot is where several meridians, including the Foot Yangming Stomach Meridian and the Foot Jueyin Liver Meridian, pass through, with a dense network of sinew meridians. Joint noises and needle-like stabbing pain are often not isolated joint problems, but a true reflection of the state of qi and blood at the extremities of the limbs.
I. Cracking Sounds on the Dorsum of the Foot—Where Exactly Do They Come From?
The joint structure of the dorsum of the foot is far more intricate than one might imagine. Multiple articular surfaces between the tarsal bones and metatarsal bones interlock with one another, surrounded by ligaments and tendons, and friction sounds during movement are not uncommon. However, if the sounds are accompanied by needle-like stabbing pain, it becomes necessary to understand this from two aspects in traditional Chinese medicine: "sinews" and "blood."
The Huangdi Neijing · Suwen · Chapter 44 on Flaccidity states: "The ancestral sinews govern the binding of bones and facilitate the joints." This passage strikes at the crux—the ancestral sinews constrain the bones and lubricate the joints. Whether the joints can move flexibly and freely depends on the nourishing state of the ancestral sinews. In plain terms, the ancestral sinews are a general term for the tendons and soft tissues wrapping around the joints. When qi and blood are abundant, the sinews and vessels are supple and moist, and joint movement is naturally smooth and silent; when qi and blood are deficient or their movement is obstructed, the sinews and vessels lose their nourishment, and joint friction may produce sounds.
Needle-like stabbing pain conveys a different kind of information. Traditional Chinese medicine theory points out that stabbing pain is mostly related to blood stasis, distinct from sensations such as soreness, distension, or heaviness. When blood movement is unsmooth and stasis accumulates in the meridians, stabbing pain at a fixed location follows. When cracking sounds and stabbing pain appear simultaneously, it suggests not only "loss of nourishment of the sinews" but also "obstruction of blood movement" as an additional factor.
Why is the dorsum of the foot particularly prone to this condition? The dorsum of the foot is located at the extremity of the limbs, and qi and blood must travel a relatively long path to reach this point. In addition, during daily walking and standing, the dorsum of the foot endures repeated traction. If the individual's qi and blood foundation is insufficient, or if prolonged walking and standing deplete qi and blood, this area becomes a weak link. Clinically, cracking sounds on the dorsum of the foot with needle-like stabbing pain is more commonly seen in middle-aged and elderly populations, and can also be observed in those who stand for long periods at work, those whose exercise volume suddenly increases, or those who ordinarily lack physical activity.
II. Why Does Needle-Like Stabbing Pain Point to Blood Stasis?
Needle-like pain has a unique position in traditional Chinese medicine inquiry. Distending pain mostly belongs to qi stagnation; heavy pain mostly belongs to dampness obstruction; dull pain mostly belongs to deficiency; and stabbing pain that is fixed and immovable, with obvious tenderness on pressure, often points to blood stasis. There is more than one pathway for the formation of blood stasis—qi deficiency means insufficient strength to propel blood movement, so blood stagnates; cold pathogens cause contraction and congealing, and blood congeals upon encountering cold; prolonged walking and standing damage the sinews and vessels, and local blood circulation is obstructed. If the stabbing pain on the dorsum of the foot is obvious at the beginning of activity and slightly relieved after moving for a period, it is mostly seen when qi and blood movement is slow and blood stasis is just beginning to form; if the pain persists without reduction, and stabbing pain is still felt even at rest, it indicates that blood stasis has already accumulated to a certain degree.
At the same time, observing the pattern of joint sounds helps to determine constitutional tendencies. If the sounds are crisp, obvious upon rising in the morning, and reduced after activity, it is mostly seen when loss of nourishment of the sinews and vessels with qi and blood deficiency is the root; if the sounds are dull and worsen on rainy days or in cold, it is related to cold-dampness pathogens flowing into the joints. When needle-like pain and joint clicking coexist, clinically it is necessary to distinguish whether blood stasis predominates or loss of nourishment of the sinews and vessels predominates—the directions of regulation differ between the two and cannot be generalized.
In clinical practice in traditional Chinese medicine, if some individuals simultaneously have mild swelling of the dorsum of the foot, dull-dark skin color, or visible blue-green veins, they may belong to a state of relatively obvious qi-blood stasis; if accompanied by soreness and pain in the heel, and soreness and weakness of the lower back and knees, it is more related to insufficiency of the liver and kidneys and loss of nourishment of the sinews and bones.
III. Viewing the Qi-Blood Pathways of the Dorsum of the Foot from the Course of the Sinew Meridians
The dorsum of the foot is not an isolated structure. The Foot Yangming Stomach Meridian descends from the anterior aspect of the thigh to the dorsum of the foot and distributes to the lateral side of the second toe; the Foot Jueyin Liver Meridian ascends from the dorsum of the foot along the medial aspect of the lower limb; the Foot Shaoyang Gallbladder Meridian also passes through the lateral aspect of the dorsum of the foot. These three meridians interweave across the dorsum of the foot, among which the Stomach Meridian is a meridian of abundant qi and abundant blood, the Liver Meridian governs the sinews and stores blood, and the Gallbladder Meridian governs the bones and joints. The flexibility and strength of the dorsum of the foot are directly related to the abundance or decline of qi and blood in these three meridians.
The Stomach Meridian has abundant qi and abundant blood and is the foundation of the acquired constitution. When the spleen and stomach's transportation and transformation functions are good, there is a source for the generation and transformation of qi and blood, and the sinews and vessels of the dorsum of the foot can receive sufficient nourishment. If dietary habits are irregular and the spleen and stomach are weak, the generation and transformation of qi and blood are insufficient, the sinews and vessels of the dorsum of the foot lose nourishment, and the joints may produce sounds. The Liver Meridian courses around the dorsum of the foot; when liver blood is abundant, the sinews and vessels are supple and strong; when liver blood is insufficient, the sinews and vessels lose moisture and nourishment, and joint movement becomes stiff and noisy. The Gallbladder Meridian is related to bone growth and the free movement of joints; when the meridian qi of the Gallbladder Meridian is unfavorable, joint flexion and extension may also be affected.
From this perspective, although the presentation is the same—cracking sounds on the dorsum of the foot, like needle pricks—the links of qi-blood disharmony differ among individuals. Some need to start with the spleen and stomach, some need to focus on liver blood, and some need to also address the removal of cold-dampness pathogens. This is precisely the embodiment of traditional Chinese medicine's thinking of "treating the same disease with different methods"—the symptoms are similar, but the underlying qi-blood states and the deficiency or excess of meridians and collaterals each differ.
IV. Mulberry Twig: A Gentle Choice for Freeing the Joints
When discussing daily maintenance of qi and blood in the dorsum of the foot, mulberry twig is a medicinal material worth understanding. Mulberry twig is the young branch of the mulberry tree; its nature is neutral, its flavor slightly bitter. Traditional materia medica holds that it enters the Liver Meridian and has the effects of dispelling wind and freeing the collaterals, and benefiting the joints. In clinical practice in traditional Chinese medicine, mulberry twig is often used for those with contracture and spasm of the four limbs and unfavorable joint flexion and extension, and it has a relatively gentle effect on freeing the meridians and collaterals of the joints of the upper and lower limbs.
The applicable scenarios for mulberry twig have their own pattern-differentiation bias. For those with joint sounds accompanied by soreness and pain, worsening upon exposure to cold, and obvious discomfort on rainy days, the collateral-freeing nature of mulberry twig helps improve the state of cold-dampness obstruction in the meridians and collaterals. Its nature is relatively gentle; compared with some wind-dispelling and dampness-removing substances with fierce medicinal properties, it is more suitable for daily maintenance scenarios. In traditional dietary therapy, mulberry twig is often used to boil water as a tea substitute or stewed with meat in soup, taking advantage of its auxiliary role in freeing the meridians and collaterals.
It should be noted that although mulberry twig has the function of freeing the collaterals, for those in whom qi-blood deficiency and loss of nourishment of the sinews and vessels are more prominent, merely freeing the meridians and collaterals is not enough. It is like a river channel whose water volume is already insufficient; merely clearing silt cannot solve the problem of water shortage. This leads to another medicinal material that has a complementary meaning to mulberry twig—achyranthes root.
V. Achyranthes Root: A Maintenance Approach of Tonifying the Liver and Kidneys
Achyranthes root occupies an important position in traditional Chinese materia medica. Its flavor is bitter and sour, its nature neutral, and it enters the Liver and Kidney meridians. The origin of the name achyranthes root is related to its morphology—its stem nodes swell like the knees of an ox, and traditional Chinese medicine holds that it can tonify the liver and kidneys, strengthen the sinews and bones, and guide blood downward, so that blood in the upper body can be guided downward to nourish the lower limbs.
The scenarios corresponding to achyranthes root differ from those of mulberry twig. For those with sounds on the dorsum of the foot accompanied by soreness and weakness of the lower back and knees, dull pain in the heel, worsening after exertion, and relief after rest, the core of the condition is often not "obstruction" but "failure to flourish"—insufficiency of the liver and kidneys, with the sinews and bones losing nourishment. The effects of achyranthes root in tonifying the liver and kidneys and strengthening the sinews and bones precisely meet the needs of this aspect.
Although mulberry twig and achyranthes root are two different medicinal materials, there is an interesting complementary relationship between them in traditional dietary therapy. Mulberry twig excels at freeing stagnation in the meridians and collaterals, while achyranthes root excels at tonifying deficiency of the sinews and bones; one solves the problem of "obstruction," and the other solves the problem of "failure to flourish." In actual clinical practice, many people with discomfort of the joints of the dorsum of the foot do not have a pure excess pattern or a pure deficiency pattern, but a mixture of deficiency and excess—there is both the "excess" of blood stasis and cold-dampness obstructing the meridians and collaterals, and the "deficiency" of insufficient qi and blood of the liver and kidneys. The combined use of the two medicinal materials, simultaneously freeing and tonifying, is more compatible with this complex state.
Of course, the selection of any medicinal material must be combined with the individual's constitution. Whether cold-dampness predominates or blood stasis predominates, whether liver-kidney insufficiency is primary or spleen-stomach weakness is primary—this requires a licensed traditional Chinese medicine practitioner to make a comprehensive judgment through inspection, auscultation and olfaction, inquiry, and palpation. Popular science articles can only provide a cognitive framework and cannot replace the specific process of pattern differentiation.
VI. Self-Observation Beyond Diet and Daily Routine
In maintaining the dorsum of the foot, there is no need in diet to pursue some single "targeted food," but rather to focus on the overall generation and transformation of qi and blood. The spleen and stomach are the foundation of the acquired constitution; regular eating, chewing carefully and swallowing slowly, and avoiding excessive cold and raw foods are more fundamental than seeking a particular tonic food. For those with a predominance of cold-dampness, appropriately reducing the intake of cold and raw fruits and melons may help alleviate joint discomfort to some extent; for those with qi-blood deficiency, ensuring sufficient intake of high-quality protein and staple foods is the material basis for the generation and transformation of qi and blood.
Regarding the rhythm of daily routine, the qi and blood of the dorsum of the foot are in the same frequency as the overall rhythm of qi-blood movement. Sleeping before the hour of Zi (11 p.m. to 1 a.m.) helps the restoration of the liver and gallbladder meridians and their blood-storing function, while standing or walking for long periods at night increases the qi-blood burden on the feet. In terms of exercise and daoyin, traditional daoyin techniques such as Baduanjin and Taijiquan help the circulation of qi and blood throughout the body, but the specific movement essentials need to be guided by professionals; one cannot benefit simply by imitating at will.
In daily self-observation, it is helpful to pay attention to several details: Is the timing of the sounds upon rising in the morning or after activity? Is the stabbing pain relieved after rest or worsened after walking? Is the local skin temperature of the dorsum of the foot cooler or warmer? These subtle differences are all important reference information to provide to a licensed traditional Chinese medicine practitioner in future consultations. Every signal sent by the body is telling the true state of qi-blood movement.
Have you ever thought that cracking sounds on the dorsum of the foot, like needle pricks, may not merely be the inevitable outcome of joint aging, but rather the result of the combined action of malnourished ancestral sinews and qi-blood stasis? It may be the body reminding you—the qi-blood pathways of the feet need to be seen.
References:
1. The original text of the Huangdi Neijing · Suwen can be consulted in the traditional Chinese medicine ancient literature database: https://tcmdata.cintcm.com/
2. World Health Organization strategy documents 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/
Related Knowledge Q&A
I. What exactly causes cracking sounds on the dorsum of the foot?
Traditional Chinese medicine holds that for I. cracking sounds on the dorsum of the foot, one must start from holistic pattern differentiation, integrate the four examinations of inspection, auscultation and olfaction, inquiry, and palpation, and make a comprehensive judgment in light of individual constitutional characteristics; it cannot be generalized. The specific direction of regulation must be determined by a licensed traditional Chinese medicine practitioner after an in-person consultation.
II. For needle-like stabbing pain, how long is the regulation cycle?
The regulation cycle varies from person to person and is related to factors such as the individual's constitutional foundation and the degree of cooperation with lifestyle habits. Traditional Chinese medicine emphasizes gradual progress; the specific cycle must be evaluated by a licensed traditional Chinese medicine practitioner after an in-person consultation according to individual circumstances. This material does not provide commitments regarding a specific cycle.
III. From the perspective of the course of the sinew meridians, what should be noted in daily care of the dorsum of the foot?
For daily maintenance, it is recommended to maintain a regular routine, a balanced diet, moderate exercise, and emotional stability. Specific precautions should be flexibly adjusted according to individual constitution and seasonal changes; a licensed traditional Chinese medicine practitioner can be consulted for targeted advice.