The Huangdi Neijing · Suwen · Chapter 5 on the Correspondence of Yin and Yang states: "When the dampness of the earth is felt, it harms the skin, flesh, sinews, and vessels." In general, this means that when dampness from the natural environment invades the human body, it most readily attacks our skin, flesh, sinews, and vessels. Dampness is heavy, turbid, sticky, and lingering—like a wet cotton coat wrapped around the body, leaving one feeling unrefreshed and uncomfortable. This kind of soreness and heaviness is not severe pain, yet it lingers like a shadow—unnoticeable upon waking in the morning, but gradually worsening by the afternoon, as if the body has been filled with lead.
Have you ever experienced this feeling? Before rushing to find a "miracle formula for dispelling dampness," let us first examine the course of the channels and collaterals and the rhythm of the twelve time periods to carefully distinguish where this soreness and heaviness truly originates.
I. Afternoon Heaviness During the Spleen Channel Time Period: A Typical Signal of Dampness Encumbering
The Spleen Channel originates at the medial side of the big toe, ascends along the medial aspect of the lower leg, passes through the anterior border of the medial knee and thigh, enters the abdomen, and ends at the hypochondrium. This channel is most closely related to the "muscles and four limbs." Chinese medicine theory points out that the spleen governs the muscles and four limbs and is responsible for transporting and transforming water and dampness. When spleen qi is robust in transportation, water and dampness are metabolized normally; when spleen yang is insufficient or dampness is excessive, water and dampness will stagnate between the muscles and the interstitial spaces.
The afternoon Weishi period (13:00–15:00) is precisely the time when the Spleen Channel qi and blood are at their most vigorous. Interestingly, many people feel even more sore, heavy, and drowsy during this period, which is exactly consistent with the mechanism of "the spleen being encumbered by dampness." From the perspective of clinical Chinese medicine, the vague generalized soreness and heaviness is most commonly seen in people who live in damp environments for prolonged periods, prefer raw, cold, greasy foods, and lack exercise. Such individuals often also present with loose stools, poor appetite, and a sticky sensation in the mouth.
Clinically, it is necessary to first distinguish whether dampness or spleen deficiency is the predominant factor. In those with predominant dampness, the heavy sensation of the body is especially obvious, and the tongue coating is white and greasy or yellow and greasy. In those with predominant spleen deficiency, in addition to soreness and heaviness, there are often manifestations such as fatigue, shortness of breath, and a sallow complexion. The treatment approaches for the two differ: the former focuses on transforming dampness, while the latter focuses on strengthening the spleen. In daily life, moderate consumption of foods that strengthen the spleen and transform dampness, such as coix seed, white hyacinth bean, and tangerine peel, may be helpful in improving this constitution.
Zusanli (ST36) is located on the lateral side of the lower leg, three cun below Dubi (ST35), one finger-width lateral to the anterior crest of the tibia. It is the He-Sea point of the Stomach Channel. In the Lingshu · Five Evils, there are records regarding Zusanli's treatment of conditions such as "excess of yang qi and deficiency of yin qi." Moxibustion, as one of the commonly used external therapies in Chinese medicine, has been mentioned in medical literature throughout the dynasties for regulating this point. However, specific applications must be determined by a licensed Chinese medicine practitioner according to individual constitution; one must not blindly perform moxibustion on oneself.
II. Morning Soreness and Heaviness During the Lung Channel Time Period: A Different Explanation
The Lung Channel originates in the middle burner, descends to connect with the large intestine, winds back around the upper orifice of the stomach, passes through the diaphragm, and belongs to the lung. From the lung system it emerges transversely from the axilla, descends along the anterior border of the medial aspect of the upper arm, passes through the cubital fossa, enters the Cunkou area, runs along the thenar eminence, and emerges at the medial end of the thumb. The Yinshi period (3:00–5:00) is the time when the Lung Channel is in command, and at this moment the body's qi and blood transition from stillness to movement.
The lung governs the skin and body hair and disseminates defensive qi to the body surface. When the lung's disseminating function is impaired, defensive qi cannot be properly distributed to the skin and interstitial spaces, resulting in a sensation of aching that is "pain-like yet not pain, heaviness-like yet not heaviness." This morning soreness and heaviness is fundamentally different in mechanism from afternoon drowsiness and heaviness; it is more related to failure of lung qi to disseminate and disharmony between nutritive and defensive qi. If some individuals also experience susceptibility to colds, fear of wind, and dry skin, they may be in a state of lung-defensive qi deficiency. In such cases, simply dispelling dampness is not appropriate; instead, attention should be paid to guarding and protecting lung qi.
In Chinese medicine theory, there is a "mother-child" relationship between the lung and the spleen—spleen earth generates lung metal. Therefore, prolonged spleen deficiency with dampness excess often affects the disseminating and descending functions of lung qi. In clinical practice, many people with generalized soreness and heaviness also present with chest tightness, shortness of breath, and thin clear phlegm, which are exactly manifestations of the failure of taiyin channel qi to transform. To regulate this condition, Chinese medicine emphasizes the approach of "cultivating earth to generate metal," indirectly nourishing lung qi by strengthening and transporting the spleen and stomach.
Lieque (LU7) is the Luo-Connecting point of the Lung Channel, located superior to the styloid process of the radius, 1.5 cun above the transverse wrist crease. The Zhenjiu Dacheng records that it treats "cough with copious phlegm, wheezing, and fullness." In the "Song of the Four General Points," there is also the saying "for head and neck conditions, seek Lieque," showing its wide range of applications. For those with pronounced morning soreness and heaviness, understanding the location and classical records of this point helps in comprehending the involvement of the Lung Channel, but specific regulation methods still require professional guidance.
III. Generalized Soreness and Heaviness Along the Bladder Channel: Closely Related to the Movement of Foot-Taiyang Channel Qi
The Bladder Channel is the longest channel in the human body. It originates at the inner canthus, ascends to the forehead and intersects at the vertex, enters the brain from the vertex, then emerges to descend along the back of the neck, runs parallel to the spine on both sides of the scapulae, reaches the lumbar region, passes through the buttocks, enters the popliteal fossa, travels down the posterior aspect of the lower leg, runs along the lateral side of the foot behind the external malleolus, and ends at the lateral side of the small toe. This channel almost traverses the entire back and the posterior aspect of the lower limbs.
During the Shenshi period (15:00–17:00), qi and blood flow into the Bladder Channel, which should be a time of mental alertness and high work efficiency. However, if the qi transformation of the Bladder Channel is impaired and fluid metabolism is abnormal, one may instead feel soreness and heaviness in the lower back and legs. The difference between this soreness and heaviness and that of spleen channel dampness is that its distribution is more extensive and is often accompanied by stiffness in the posterior neck and a heavy sensation in the lower back.
The Bladder Channel and the Kidney Channel are internally-externally related. Kidney yang is the root of yang qi of the entire body and is responsible for warming and promoting fluid metabolism. When kidney yang is insufficient, the qi transformation of the Bladder Channel is weak, and water dampness tends to stagnate along the pathway of the channel. Clinically, such individuals often also present with cold pain in the lower back and knees, frequent nocturia, and fear of cold with cold extremities. In terms of disease severity, dampness encumbering the Spleen Channel is mostly excess in nature with a relatively shallow disease level; while Bladder Channel qi transformation failure due to kidney yang deficiency is mostly a mixture of deficiency and excess, with a relatively deeper disease level.
Chinese medicine theory points out that the Back-Shu points of the Bladder Channel are the sites where the qi of the internal organs is infused onto the body surface. Understanding the general pathway and functional characteristics of this channel helps explain why generalized soreness and heaviness sometimes shows an obvious localized tendency in the back and lower back. The back is the place where yang qi of the human body gathers. In daily life, keeping the back warm and avoiding sweating in the wind can help maintain the qi transformation function of the Bladder Channel. In terms of exercise and guidance, the movement "Two Hands Hold the Feet to Strengthen the Kidneys and Lower Back" in Baduanjin is a classic exercise for soreness and heaviness of the lower back. Its principle lies in stretching the pathways of the Bladder Channel and Kidney Channel, but practice should be within one's capacity, with slow and gentle movements, and without forcing the range of motion.
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 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/
Related Knowledge Q&A
I. What causes afternoon drowsiness during the Spleen Channel time period?
Chinese medicine holds that afternoon drowsiness during the Spleen Channel time period must be analyzed from an overall pattern differentiation perspective, using the four diagnostic methods (inspection, auscultation-olfaction, inquiry, and palpation) in combination with individual constitutional characteristics for a comprehensive judgment. It cannot be generalized. The specific treatment direction must be determined by a licensed Chinese medicine practitioner after an in-person consultation.
II. How long is the treatment course for morning soreness during the Lung Channel time period?
The treatment course varies from person to person and is related to factors such as individual constitutional foundation and compliance with lifestyle habits. Chinese medicine emphasizes gradual progress. The specific course duration must be assessed by a licensed Chinese medicine practitioner after an in-person consultation based on the individual's condition. This material does not provide a specific course commitment.
III. What should be noticed in daily life regarding the Bladder Channel coursing through the body?
In terms of daily care, it is recommended to maintain regular sleep schedules, a balanced diet, moderate exercise, and emotional stability. Specific precautions should be flexibly adjusted according to individual constitution and seasonal changes. One may consult a licensed Chinese medicine practitioner for targeted advice.