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The syndromes of internal injury caused by fatigue, overwork, and dietary irregularities are indeed different from diseases caused by external pathogenic factors such as wind, cold, summer-heat, and dampness. However, is there no way to distinguish between injuries caused by fatigue and those caused by diet?

Speaking of fatigue, the *Classic of Internal Medicine* (*Huangdi Neijing*) states: "Yin deficiency generates internal heat." It also says: "Due to excessive fatigue, the form and vital energy decline, the Qi of grain and water becomes insufficient, the Upper Jiao fails to function, and the lower stomach (pylorus) fails to transmit. The heat of Stomach Qi steams the chest, thus generating internal heat; this is the origin of internal injury."

However, Yin and Yang in the human body can be discussed from the perspective of exterior and interior, from the division of upper and lower parts, or from the ascending and descending and breathing Qi. The "Yin" referred to here as "Yin deficiency" generally refers to the Yin Qi within the body and the essence of grain and water. Excessive labor causes Qi transformation to turn into Fire, while the intake of food and drink decreases; therefore, Yang becomes more abundant, and Yin becomes more deficient. This refers to the body's Yin Qi and the essence of food and drink.

Since fatigue and dietary injuries damage the Qi aspect, having distinctions between Yin Qi and Yang Qi, do injuries to the Blood aspect caused by excessive thinking and sexual indulgence not have distinctions between Yin Blood and Yang Blood? From this, we see that "Blood is Yin, Qi is Yang" reflects the meaning of distinguishing Yin and Yang aspects; while "Qi and Blood each contain Yin and Yang" reflects the principle that Yin and Yang are mutually rooted.

The general treatment principles are: For Qi Yang deficiency, it is appropriate to use Guizhi Tang (Cinnamon Twig Decoction) and Fuzi (Prepared Aconite Root), combined with Renshen (Ginseng) and Fuzi for vigorous tonification; for Qi Yin deficiency, use Renshen (Ginseng), Baizhu (Atractylodes Macrocephala Rhizome), and Gancao (Licorice Root) for slow nourishment; for Blood deficiency in the Yin aspect, use Shengdi Huang (Rehmannia Root), Xuanshen (Scrophularia Root), Guiban (Tortoise Shell), Zhimu (Anemarrhena Rhizome), and Huangbai (Phellodendron Bark) for tonification; for Blood deficiency in the Yang aspect, use Fuling (Poria), Renshen (Ginseng), Danggui (Angelica Sinensis Root), and Yuanzhi (Polygala Root) for tonification.

When discussing this, the contributions of Li Dongyuan and Zhu Danxi are truly great! However, some who speak only of the Lower Jiao Yin aspect or Kidney Water True Yin are incorrect.

"What is fatigued" refers to excessive movement belonging to the Fire category; "decline of form and Qi" refers to Hyperactive Fire consuming Qi; "insufficiency of Grain Qi" means that damaging Yuan Qi leads to reduced appetite and weak Qi; "failure of the Upper Jiao" refers to the failure of Clear Yang to ascend; "blockage of the lower stomach" refers to the failure of Turbid Yin to descend.

The Stomach receives food and drink; only when Yang ascends and Yin descends can transformation and excretion occur to nourish the whole body. Now, if the Stomach's receiving function is poor and Qi is weak, Clear Qi will not ascend and Turbid Qi will not descend. Hence it is said, "The Upper Jiao fails to function, and the lower stomach is blocked." This does not mean absolute blockage, but rather a relative state compared to normal people. If the Upper Jiao fails to clear and the Lower Jiao fails to unblock, stagnation occurs. Stagnation transforms Shaohuo (Physiological Fire) into Zhuanghuo (Pathological Fire). Since the Stomach is located between the Upper Jiao and the lower stomach, Stomach Qi becomes hot. The heat flares upward, steaming the chest and causing internal heat.

Internal injury initially presents as Re Zhong (Heat Syndrome) and later transmits to Han Zhong (Cold Syndrome). Cold syndrome generated by Yin excess often results from therapeutic errors or improper use of purgatives. Exposure to cold causes cold limbs, cardiac and gastric colic, and spontaneous cold sweating, indicating Spleen-Stomach deficiency-cold. It is appropriate to use acrid-hot warming herbs to regulate the Middle and Lower Jiao.

Fatigue consumes Qi, leading to shortness of breath, panting, and sweating, where both internal and external Qi escape; thus, it is called Qi consumption. Qi consumption leads to hyperactive Fire, which attacks the Spleen Earth. Since the Spleen governs the four limbs, symptoms include irritability, weakness, reluctance to speak, panting and fatigue upon movement, surface heat or aversion to cold due to surface deficiency, irritability, and insomnia.

In the early stage of occupational fatigue, there is poor appetite, dark yellow urine, constipation or tenesmus with only small amounts of white pus, frequent flatulence, or diarrhea of white or yellow porridge-like stool. There is bitter sensation and epigastric fullness, or pain in the epigastrium like knife-cutting, sometimes radiating to both hypochondria. This is due to Minister Fire rising from below the umbilicus, causing rebellious Qi of the Yangming Meridian in the chest, and severe cases may involve high-pitched panting. These symptoms often alternate rather than appearing simultaneously, differing from external contraction.

Treatment should focus on calming the mind and resting. The intention of the Heart corresponds to True Earth (Spleen); restless thoughts cause Spleen fatigue. Use sweet-cold herbs to drain fire and heat, sour herbs to astringe scattered Qi, and sweet-warm herbs to tonify the Middle. The Classic states: "For fatigue, use warmth; for deficiency, use tonification." This is correct. In healthy individuals, a large pulse indicates a fatigue pulse, and an extremely deficient pulse also indicates fatigue. In fatigue disease, the pulse is floating and large, with vexatious heat in hands and feet; symptoms worsen in spring and summer and improve in autumn and winter. A large pulse indicates heat pathogen; extreme deficiency indicates Qi damage; worsening in spring/summer is because the season aids the pathogen; improving in autumn/winter is because the season overcomes the pathogen. Treating with Jianzhong Tang (Middle-Building Decoction) or Buzhong Yiqi Tang (Tonify the Middle and Augment Qi Decoction) follows the principle of "warming." The Classic says: "Dampness can remove great heat," which aligns with this logic.

Although so, fatigue has two types. Pure Qi injury from physical labor without sweat follows the principle of Buzhong Yiqi Tang. When Spleen-Stomach deficiency leads to hyperactive Heart Fire attacking the Spleen Earth, and subsequently the Lung Qi is affected, one must heavily use Huangqi (Astragalus Root), followed by Renshen (Ginseng) and Gancao (Licorice Root). When Spleen-Stomach is deficient, Lung Qi is first exhausted; thus, Huangqi is used to benefit the skin and hair and close the interstices to prevent spontaneous sweating, panting, and shortness of breath. To replenish damaged Yuan Qi, Renshen is used. To address Heart Fire attacking the Spleen, roasted Gancao's sweet-warm nature is used to drain fire and tonify Spleen-Stomach Yuan Qi. If there is acute Spleen-Stomach pain or abdominal constriction, these herbs should be used in larger doses. The Classic says: "For urgency, use soothing methods." Baizhu (Atractylodes Macrocephala Rhizome) is acrid-bitter-warm, clearing damp-heat in the Stomach and promoting blood flow in the waist and umbilical region. For sinking Clear Qi in the Stomach, Shengma (Cimicifuga Rhizome) and Chaihu (Bupleurum Root) are used to guide the sweet-warm aroma of Huangqi and Gancao upward, replenishing dispersed Wei Qi and consolidating the exterior, while relieving the constriction of the Dai Meridian. These two herbs are slightly flavored, representing Yang within Yin, guiding Clear Qi upward.

For Qi chaos in the chest causing confusion of Clear and Turbid, Chenpi (Tangerine Peel) is used to regulate Qi, assisting Yang Qi ascent and dispersing stagnant Qi, aiding various sweet-acrid herbs. When Spleen-Stomach Qi is deficient and cannot ascend and float, and its generating Qi is damaged by Yin pathogens, Ying Blood is severely depleted, Ying Qi fails to nourish, and Yin Fire blazes. This is latent fire in the blood slowly simmering, daily reducing Qi and Blood. The Heart governs Blood; when Blood is reduced, the Heart lacks nourishment, causing mental disorder and vexation, a condition named "Palpitations" (Ji). Ji means mental confusion and restlessness. Therefore, add acrid-sweet slightly warm agents to generate Yang Qi; when Yang is robust, it generates Yin Blood, further harmonized with Danggui (Angelica Sinensis Root). For severe cases, administer two doses per day until Yin and Yang harmonize and spontaneous sweating occurs, curing the disease; this is not meant as diaphoresis.

Mental labor combined with Blood injury with sweating follows the principle of Huangqi Jianzhong Tang. Combined mental and physical labor with Qi and Blood injury gives rise to Shuanghe San (Double Harmony Powder). All Qi-tonifying soups and Baoyuan Tang (Preserve Origin Decoction) are derived from Buzhong Yiqi Tang and Jianzhong Tang. GuiPi Tang (Restore the Spleen Decoction), Yangxin Tang (Nourish the Heart Decoction), and other newly established formulas are derived from Shuanghe San.

Furthermore, sexual exhaustion injuring the Kidney presents similarly to fatigue; both are internal injury fever syndromes. Fatigue is due to sinking of Yang Qi, requiring Qi tonification to lift; sexual exhaustion is due to rising of Yang Fire, requiring Yin nourishment to descend. One lifts, one descends; they are completely different (see Fever section).

Emotional disturbances affecting Qi present with pulses similar to dietary injuries. Both diet and emotions can block the Three Jiao and steam the Lungs and Stomach. The Lung is the master of Qi; thus, its disseminating and diffusing functions are lost, making the Qi Kou (Radial Artery at the wrist) uniquely tight and abundant. Symptoms like vomiting, diarrhea, fullness, and abdominal pain are very similar. However, food injury involves aversion to food, whereas emotional injury, even feeling full, does not involve aversion to food; temporary observation and inquiry are necessary.

Briefly described above, these should be integrated across categories. Regarding dietary injury, the Classic states: "Excessive drinking causes Qi rebellion; overeating causes tendons and vessels to relax, leading to intestinal dysentery and hemorrhoids." Alcohol is intangible Qi; injury requires diaphoresis and diuresis to disperse dampness downward and upward, using Jiejiu Tang (Alcohol Detoxification Decoction) or Wuling San (Five-Ingredient Poria Powder). Alcohol's nature is purely Yang; using extreme hot or cold purgatives damages intangible Qi while attacking tangible Yin Blood, depleting True Water, exacerbating Yang toxicity and Yin Fire rushing upward, destroying Yuan Qi and destabilizing the Seven Spirits. Though not immediately fatal, it leads to consumptive disease. Therefore, alcohol jaundice should not be treated with purgatives; prolonged misuse leads to black jaundice.

Food is tangible matter; injury requires reducing grain accumulation, preferably via digestion promotion. Dingxiang Lanfan Wan (Carnation Rotting Rice Pill) or Zhizhu Wan (Immature Bitter Orange and Atractylodes Pill) are indicated. For heavier cases, attack and transform using Sanleng Xiaoji Wan (Spotted Snailroot Accumulation-Dissipating Pill) or Muxiang Jianzhong Wan (Costus Root Middle-Joint Pill - *Note: Text likely implies a specific formula*). For severe cases, induce vomiting or purging using Goudisan (Melon Spore Powder) or Beiji Wan (Emergency Pill). These are general principles.

Analyzing carefully: Injury from starvation followed by overeating without stagnation, or fatigue after irregular diet, or irregular diet after excessive fatigue, are all deficiencies requiring tonification. Self-induced overeating or competitive eating causing stagnation are excesses requiring digestion promotion. Injuries from raw/cold/hard foods differ from spicy/hot foods. Variations in temperature ratios or sequence of ingestion affect digestion differently. How can one stick to one method? Moreover, individual constitutions vary. Some require both tonification and digestion promotion; some need only digestion promotion; some resolve spontaneously needing only tonification or none. Jiegu and Dongyuan's Zhizhu Wan, though termed digestion-promoting, contains tonifying intent. Baizhu is sweet-bitter-warm; sweet-warm tonifies Spleen Yuan Qi, bitter clears Stomach damp-heat, benefiting waist/umbilical blood. It tonifies Spleen-Stomach weakness twice as effectively as Zhishi (Immature Bitter Orange) which breaks down accumulation. Zhishi is bitter-cold, draining epigastric fullness and digesting Stomach injury. It takes 1-2 hours to work, implying tonifying deficiency first, then resolving injury, avoiding harshness.

Lotus leaf is hollow like Zhen (Thunder), representing movement. It resonates with Shaoyang Gallbladder Qi (Wind), the root of generation. The Classic says: "Establish the beginning, order follows without error." Food entering the Stomach, Ying Qi ascends, corresponding to Shaoyang Gallbladder Qi. Hand Shaoyang Sanjiao Meridian governs Stomach Qi, Grain Qi, Yuan Qi, and Gallbladder ascending Qi as one. Lotus leaf resembles Wind-Wood; food and medicine sensing this Qi help Stomach Qi ascend. Cooking rice with medicine assists Baizhu in nourishing the Stomach, preventing internal injury.

Using hot herbs like Dingxiang or Badou for heat injury, or cold herbs like Dahuang or Qianni for cold injury, leaves drug toxicity, damages Yuan Qi, and drains Upper Jiao Clear Qi from Middle Jiao injury, secretly shortening life. Other formulas like Muxiang Fenqi Wan, Daoqi Zhishi Wan, etc., lack tonification but are suitable for transient stagnation with mild Qi damage, provided they are not viewed as universal promoters. If stagnation exceeds Zhizhu Wan's capacity, one must change methods. Thus, Beiji Wan and Goudisan are not discarded.

Skilled generals know when to attack and defend; failures lie with the commander, not the troops. Understanding this clarifies digestion, tonification, and purgation. Alas! Internal injury includes not just fatigue. Diet has excess and deficiency. Misusing tonification creates phlegm-dampness via sweet-warm herbs, leading to vomiting, diarrhea, and distension. Misusing purgatives damages Yuan Qi, causing collapse and death. The stakes are high; hence this treatise on distinguishing internal injury.