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Malaria is a disease characterized by the struggle between pathogenic factors and healthy qi. When pathogenic factors take advantage of the deficiency of healthy qi, cold and heat attack each other alternately; symptoms cease and then recur, making it the most severe in its manifestations, hence named "malaria." Although malaria presents with various symptoms, it will not occur without external pathogenic invasion, nor can external pathogens enter if there is no internal opportunity for them to exploit. The discussion in this chapter of the *Suwen* (Basic Questions) is thorough and detailed, more so than in other chapters discussing diseases. The chapter consists of fourteen sections: the first section generally discusses the cold and heat of malaria in its first half, and daily malaria in its second half; the second section discusses every-other-day malaria; the third section discusses the variation in the timing of malaria onset (early or late); the fourth section further explains every-other-day malaria; the fifth section discusses the causes of malaria onset, which initially have no fixed pattern; the sixth section discusses how pathogenic factors retained internally must rely on the movement of Wei Qi (Defensive Qi) to cause illness; the seventh section discusses the differences between Cold Malaria, Warm Malaria, and Dan Malaria; the eighth section states that treatment should not be attempted once malaria has already manifested; the ninth section reiterates the causes of malaria onset, similar to the first section; the tenth section states that to treat malaria, one must act before onset, consistent with the eighth section; the eleventh section discusses how the cessation and recurrence of malaria depend on Wei Qi, consistent with the sixth section; the twelfth section discusses malaria occurring every three or four days; the thirteenth section states that malaria occurs in all four seasons, not just summer and autumn; the fourteenth section re-explains Warm Malaria and Dan Malaria, briefly mentioning Cold Malaria without detail. The *Neijing* (Inner Canon) classifies malaria specifically under exogenous diseases. Conditions such as Blood Malaria, Phlegm Malaria, Food Stagnation Malaria, and Miasma Malaria are considered concurrent syndromes within malaria, which physicians must carefully examine.

The Yellow Emperor asked: Malaria is caused by wind pathogens, yet why do they manifest at specific times? (Qi Bo's note: "Xu" implies accumulation or emaciation.) Qi Bo replied: At the initial stage of malaria, it begins with goosebumps, stretching, and yawning, followed by chills and trembling of the jaw. (Trembling refers to shivering; "Gu Han" refers to jaw vibration. Note: Pathogens enter through hair follicles, so onset first causes a chilly sensation in the hairs. Due to healthy qi deficiency failing to overcome pathogens, spirit energy becomes fatigued, the waist relaxes, and yawning occurs. Because of the chills, the jaw trembles.) Subsequently, pain affects the waist and spine. After the cold subsides, both interior and exterior become hot, causing severe headache as if splitting, and thirst for cold drinks. The Yellow Emperor asked: What qi causes this? I wish to hear the principle. Qi Bo said: It is the mutual contention of Yin and Yang above and below, alternating deficiency and excess, resulting from the shifting of Yin and Yang qi. (Yang qi descends to its extreme and then rises; Yin qi ascends to its extreme and then descends, hence "mutual contention." Deficiency of Yang leads to exterior cold; deficiency of Yin leads to interior heat; excess of Yang leads to exterior heat; excess of Yin leads to interior cold. Thus, as cold recedes and heat arises, deficiency and excess alternate, and Yin-Yang qi shift.) When Yang merges into Yin, Yin becomes full and Yang becomes deficient. Deficiency of the Yangming channel leads to chills and jaw trembling. Deficiency of the Juyang (Taiyang) channel leads to pain in the lower back, back, head, and neck. (Yang merging into Yin means Yang entering the Yin aspect. Yangming refers to the Stomach meridian. Its pathway crosses Chengjiang, descends along the mandible, emerges at Daying. Branches descend to Renying. Insufficiency causes aversion to cold, shivering, and jaw vibration. Juyang refers to the Bladder meridian. It descends from the head through the neck, along the shoulder medial to the spine, to the waist. Insufficiency causes pain in the waist, back, head, and neck.) If all three Yang channels are deficient, Yin qi prevails. Prevailing Yin causes bone coldness and pain; cold originates internally, causing both interior and exterior cold. (Note: Yang governs the exterior, Yin the interior. Pathogens in Yang lead to heat; in Yin, to cold. Now, with all three Yang merging into Yin, Yin excess is extreme, causing whole-body coldness—internal cold actually originating externally.) Excess Yang causes exterior heat; deficiency of Yin causes interior heat. Heat in both interior and exterior leads to panting and thirst, hence the desire for cold drinks. (Note: When Yin is extreme internally, Yang emerges again and becomes excessive, causing heat in both interior and exterior and thirst. This represents movement from inside out, illustrating alternating deficiency and excess. The more Yang exceeds, the more Yin is deficient. Yang excess causes exterior heat, Yin deficiency causes interior heat. This applies to all diseases, not just malaria.) These conditions arise from summer injury by heat, where intense heat lingers inside the skin but outside the intestines and stomach, residing where Ying Qi (Nutritive Qi) dwells. This causes porous sweat apertures and open cou-li (interstices), allowing autumn qi to invade. Sweat combined with wind exposure, or bathing, allows water qi to lodge in the skin, coexisting with Wei Qi. Wei Qi travels through Yang during the day and Yin at night. This pathogen moves outward when encountering Yang and inward when encountering Yin. Their conflict results in daily attacks. (Note: Earlier, alternating Yin-Yang victory explained cold and heat; here, the root cause of malaria is explored. Ying governs blood, Wei governs qi. Blood is Yin, stored internally; Qi is Yang, moving externally. The *Ling Shu* states: "Wei Qi warms muscles, fills skin, thickens interstices, and controls aperture opening/closing." Pathogens attacking humans must attach to Wei Qi to manifest because Wei Qi circulates the body. As Wei Qi moves meridians outward, pathogens follow. Here, "qi" refers to pathogenic qi. Wei Qi circulates the body daily; pathogens follow, causing daily attacks.)

The Yellow Emperor asked: Why does some malaria occur every other day? Qi Bo said: The pathogen lodges deeply, pressing inward on Yin. Yang alone flares up, while Yin pathogen adheres internally. Yin and Yang contend but cannot exit, resulting in every-other-day onset. (Note: The deeper the pathogen enters Yin, the farther it is from Yang. By the time it returns externally to align with Wei Qi, a day has passed, hence every-other-day onset.)

The Yellow Emperor asked: Good! Why do some cases start later or earlier each day? What qi causes this? Qi Bo said: Pathogens reside at Fengfu acupoint, descending along the Du meridian/spine. Wei Qi converges at Fengfu once daily and nightly. Each subsequent day, it descends one vertebral segment, delaying onset. This is because pathogens initially reside in the back. Whenever they reach Fengfu, cou-li opens, allowing pathogen entry and disease manifestation, progressively delaying daily onset. (Segment refers to vertebrae. Distant pathogens meet convergence late, causing late onset. Note: This explanation links onset timing to vertebral levels. However, underlying healthy qi deficiency causes delay; thus, "descending one segment daily" may reflect gradual healthy qi decline.) From Fengfu, descending one segment daily, after twenty-five days it reaches the sacrum. On the twenty-sixth day, it enters the spine, injecting into the Fulu muscle-vein. This qi ascends, emerging in the Quepen region after nine days. As the qi rises higher, onset occurs progressively earlier. (From neck to sacrum are twenty-four segments. Twenty-five days to sacrum, twenty-sixth day into spine/Fulu vein. Fulu vein lies between spinal muscles where Kidney meridian runs deep. Kidney meridian runs along posterior thigh, through spine, connecting to Kidneys. Direct branch ascends through Liver/Diaphragm to Lungs. Connecting to spine but not following standard acupoints, running deep along muscles, it is called Fulu vein. Since Kidney meridian connects to Lungs via Quepen, and Yin qi moves fast, this qi ascends, emerging in Quepen after nine days. Note: Spine has twenty-one segments. Descending one daily should take twenty-two days to sacrum (twenty-three including sacrum). Wang Bing's text adds three days, likely counting cervical segments. Quan Yuanqi, *Jia Yi Jing*, and *Tai Su* cite twenty-one/twenty-two days, strictly following vertebral count, implying no fundamental difference.)

Every-other-day malaria occurs because pathogens press inward on the Five Zang organs, spreading horizontally to the Mu Yuan (Sea of Origin/Mo Yuan). The path is long, qi is deep, and movement is slow, preventing synchronization with Wei Qi, causing delayed onset. (Note: Wei Qi completes one circuit daily. Deeply lodged pathogens cannot keep pace. Mu Yuan refers to the diaphragmatic origin. Pathogens penetrate deeply and broadly, hence "horizontal connection." "Mu" is written as "Mo" in Quan Yuanqi's version, *Tai Su*, and *Chou Yuan Fang*, also in *Ju Tong Lun*.)

The Yellow Emperor asked: You stated Wei Qi reaches Fengfu, opening cou-li for pathogen entry and disease. Now Wei Qi descends one segment daily; if onset doesn't happen at Fengfu, why does daily malaria occur? Qi Bo said: (New Correction notes: Quan Yuanqi, *Jia Yi Jing*, and *Tai Su* lack 88 characters from "This pathogen resides in head/neck" to "then disease manifests.") This pathogen resides in the head and neck, descending along the spine. Variations in deficiency/excess and different invasion sites mean onset need not coincide exactly with Fengfu. Thus, pathogens striking the head/neck cause disease when qi reaches there; striking the back causes disease when qi reaches the back; striking the waist/spine causes disease when qi reaches the waist/spine; striking limbs causes disease when qi reaches limbs. Disease manifests when Wei Qi location coincides with pathogen location. Therefore, there is no fixed "Fengfu"; wherever Wei Qi acts and cou-li opens, and pathogens combine, that is their "Fengfu." (Different deficiency/excess and invasion sites mean disease manifests upon Wei-pathogen combination, not necessarily at Fengfu.)

The Yellow Emperor asked: Good! Wind and malaria are similar and same-category, yet wind persists constantly while malaria has remissions. Why? Qi Bo said: Wind pathogens remain in their location, hence constant. Malaria qi sinks and presses inward along meridians, manifesting only when responding to Wei Qi. (Note: Both wind and malaria cause chills/heat, hence similarity. Wind pathogens usually have fixed locations; malaria has variable onset/remission. Manifestation depends on alignment with Wei Qi; cessation depends on separation.)

The Yellow Emperor asked: Why does some malaria begin with chills followed by heat? Qi Bo said: Summer injury by severe heat causes profuse sweating and open cou-li. Encountering cool/cold water qi in summer, it lodges in cou-li/skin. Autumn wind injury completes the pathology. Cold is Yin qi; wind is Yang qi. Injury by cold first, then wind, causes chills first, then heat. Regular onset defines Cold Malaria. (Note: Summer should be hot but is cool due to continuous rain ("Qicang" cold water). Latent Yin-cold triggers via autumn wind, forming malaria. "Regular onset" means predictable timing. Named Cold Malaria because it starts with cold.) The Yellow Emperor asked: Why does some begin with heat followed by chills? Qi Bo said: Injury by wind first, then cold, causes heat first, then chills. Regular onset defines Warm Malaria. (Note: Naming based on initial symptom is correct. Wind is Yang/Warm, hence "Warm Malaria." Distinction lies in sequence of invasion. Generally, Cold Malaria is more common than Warm Malaria; differentiation requires care.) Pure heat without chills indicates prior Yin exhaustion and isolated Yang flare-up, causing shortness of breath, vexation, hot hands/feet, and nausea. This is Dan Malaria. ("Dan" means heat. Note: "Prior exhaustion" does not mean Yin collapse, but rather rampant fire/pathogenic heat, pure Yang dominance resembling Yin-deficiency, e.g., Yangming malaria treated with Baihu Tang.)

The Yellow Emperor asked: Classics state excess is drained, deficiency is tonified. Heat is excess, cold is deficiency. Malaria cold cannot be warmed by fire/water; malaria heat cannot be cooled by ice/water. These are excess/deficiency types. At this time, even skilled doctors cannot stop it; treatment must wait for natural decline. Why? Qi Bo said: Classics advise against puncturing high fever, chaotic pulses, or profuse sweating, as pathogenic qi is rebellious and untreatable at these stages. ("Xin" means intense heat; "Hunhun" means chaotic/unstructured; "Lulu" means dripping sweat. Note: This section warns against acupuncture during active malaria; medication is similarly risky, often causing vomiting/rebellion. "Xin" sounds like "He".)

At malaria onset, Yang merges into Yin. Yang is deficient, Yin is excess; lack of exterior Yang causes initial chills. Extreme Yin rebellion forces return to Yang; Yang and Yin merge externally again. Yin becomes deficient, Yang becomes excess, causing initial heat and thirst. Malaria qi: merging into Yang causes Yang excess; merging into Yin causes Yin excess. Yin excess brings cold; Yang excess brings heat. Malaria involves fluctuating wind-cold qi; extreme pathology recurs. Onset is like fire heat or storm winds, unstoppable. (...Yin excess causes Stomach cold/chills; Yang excess causes Stomach heat/thirst. "Fu" means returning to normal state. Note: Healthy state: Yang guards exterior, Yin guards interior. Pathogens disrupt Yin-Yang balance. Yin invasion drags Yang inward, leaving exterior void. "Extreme rebellion" means peak intensity leading to reversal. Yin/Yang emerge externally again, mirroring alternating deficiency/excess. The six lines starting "Malaria qi..." explain previous text. Malaria involves unstable wind-cold; cold/heat stem from wind-cold. "Extreme pathology" mirrors "extreme rebellion": Yin extreme brings cold, Yang extreme brings heat, then malaria recurs. Explaining cold/heat solely via Stomach is erroneous.)

Before malaria onset, Yin has not merged into Yang, Yang has not merged into Yin. Regulating at this time allows Healthy Qi to settle and Pathogens to vanish. Hence, doctors cannot treat active malaria due to rebellious qi. The Yellow Emperor asked: How to attack it? Timing? Qi Bo said: Before onset, Yin-Yang are shifting, starting from extremities. Yang is injured, Yin follows. Bind the area firmly before onset to block pathogen entry and Yin exit. Observe carefully; if Sun Luo (branch vessels) are swollen/hard with blood, puncture them. This targets Healthy Qi before merging with pathogens. (Note: Treat before onset, consistent with Section 8. "Yang injured" means Yang fails to resist, allowing pathogen into Yin. "Healthy Qi proceeds without merging" means treating early prevents internal merger.)

The Yellow Emperor asked: What are signs when malaria is not active? Qi Bo said: Malaria qi alternates excess/deficiency. Wherever qi resides: Yang location causes heat/restless pulse; Yin location causes cold/still pulse. At extremes, both Yin and Yang decline, Wei Qi separates, causing remission. Wei Qi gathering causes recurrence. (Note: Question asks about inactive phase signs. Answer: Pulse stillness/restlessness reflects Yin/Yang; remission/recurrence follows Wei Qi cycles. "Both decline" means prolonged illness depletes Qi/Blood, weakening radial/cubital pulses. "Separation" means Wei Qi's daily cycle diverges from deep-seated pathogens. "Remission" is temporary pause. "Gathering" is pathogen re-aligning with Wei Qi.)

The Yellow Emperor asked: Why does some malaria occur every two days or several days, with varying thirst? Qi Bo said: Every-other-day cases involve pathogens and Wei Qi residing in Six Fu organs, occasionally missing each other, causing multi-day rests. (Note: "Missing" equals previous "separation"; greater distance means longer intervals.) Malaria involves Yin-Yang alternation; severity varies, causing variable thirst. (Yang excess over Yin causes thirst; mild Yang excess causes no thirst. "Excess" means overpowering strength.)

The Yellow Emperor asked: Classics say summer heat injury leads to autumn malaria. Why don't all cases follow this? (Note: "Not necessarily corresponding" means not all occur in autumn.) Qi Bo said: This refers to seasonal correspondence. Atypical forms contradict seasons. Autumn onset: severe cold. Winter onset: mild cold. Spring onset: aversion to wind. Summer onset: profuse sweating. (Note: Seasonal correspondence means etiology varies by season, explaining non-autumn onset. "Atypical" means symptoms contradict seasonal norms. E.g., Autumn is cool but disease causes severe cold; Winter is strict but disease lacks cold; Spring promotes flow but disease causes wind aversion; Summer promotes sweating but disease causes excessive sweating. Essentially, malaria form contradicts season, yet onset always falls within seasonal cycles; contradiction is itself correspondence. Non-autumn onset is logical. Ancient texts emphasize summer heat/autumn malaria due to prevalence.)

The Yellow Emperor asked: Where do Warm Malaria and Cold Malaria reside? Which Zang organ? Qi Bo said: Warm Malaria originates from winter wind injury, cold lodging in Marrow. Spring Yang expansion fails to expel pathogen. Summer heat scorches brain marrow, consumes muscles, opens cou-li. Physical exertion releases pathogen with sweat. Disease resides in Kidney; qi moves from interior to exterior. Yin deficiency, Yang excess causes heat. Decline allows qi to re-enter, causing Yang deficiency and cold. Heat first, then cold defines Warm Malaria. (Note: "Decline" means peak transformation, consistent with "extreme pathology." Interpreting as recovery is incorrect, as Yang deficiency/cold would not follow cure.)

The Yellow Emperor asked: And Dan Malaria? Qi Bo said: Dan Malaria stems from pre-existing Lung heat, abundant body qi, rebellious upward rush, solid interior Qi failing to vent. Physical exertion opens cou-li; wind-cold lodges in skin/muscle layers. Onset causes Yang excess; persistent Yang excess sustains disease. Qi does not reach Yin, causing pure heat without cold. Qi stores in Heart, resides in muscle layers, wasting flesh, hence named Dan Malaria. The Yellow Emperor said: Good! (Note: Internal heat plus external wind-cold constitutes Three Yang pathogenic heat, an excess type of malaria. "Qi" refers to pathogenic qi. Disease entirely in Yang, hence "not reaching Yin." Qi Bo previously explained Cold/Warm/Dan malaria with varying detail; Emperor re-asks, receiving only Warm/Dan answers, likely because Cold was addressed earlier.)