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The *Neijing* (Yellow Emperor's Inner Classic) states: Frequent consumption of fatty foods causes internal heat. Frequent consumption of sweet foods causes fullness in the middle jiao. Since the etiology of Gan disease (Pediatric Malnutrition Syndrome) is caused by fatty and sweet foods, it is named "Gan". As for infants in swaddling clothes and toddlers aged four or five, their milk feeding has not ceased, their Stomach Qi is not yet fully formed, and their Grain Qi is not yet abundant. Parents cannot regulate and nurture them properly, only indulging them out of affection, allowing them to eat indiscriminately fatty and sweet foods, raw fruits and vegetables, and all kinds of cooked and seasoned flavors, morning and night. This gradually leads to stagnation that becomes fixed and solidified, resulting in fever, emaciation, sallow complexion, or a distended abdomen with visible blue veins, abdominal pain due to parasites, diarrhea, and thus various manifestations of Gan disease appear. [Qian Yi] All types of Gan disease are diseases of the Spleen and Stomach, caused by the loss of body fluids within. Due to severe illness or after vomiting and diarrhea, physicians mistakenly use emetic and purgative drugs, leading to Spleen and Stomach deficiency and loss of body fluids. Moreover, pediatric Gan disease is mostly iatrogenic. For example, tidal fever indicates one Zang organ is deficient and another is excess, generating internal deficient heat. The treatment should tonify the mother organ and drain the affected organ to achieve cure. If tidal fever occurs at noon, it is Heart deficient heat. Since Liver is the mother of Heart, the treatment should first tonify the Liver mother; after the Liver is filled, then drain the Heart. Once the Heart receives the nourishment from its mother, the interior will be balanced, and tidal fever will heal spontaneously. Physicians seeing tidal fever wrongly assume it is an excess condition and use cold-purgative drugs like Dahuang (Rhubarb Root and Rhizome) and Yaxiao (Mirabilite) to purge. Excessive purgation that cannot be stopped leads to internal loss of body fluids, gradually forming Gan disease. Similarly, for Pi disease (abdominal mass), which presents with alternating chills and fever, thirst, and hard painful masses under the ribs, the treatment should slowly dissipate the accumulation with medicine. Instead, physicians use harsh purgatives like Badou (Croton Seed) and Naoshan (Sal Ammoniac). Children's constitutions are prone to both deficiency and excess; excessive purgation consumes Stomach fluids, gradually leading to Gan emaciation. Furthermore, in cases of Shanghan (Cold Damage) where there are excess signs in the interior after five or six days, using cold purgatives excessively damages the Spleen and Stomach and reduces body fluids, causing incessant thirst and subsequent heat generation. Internal heat consumption and external muscle wasting, combined with other pathogenic factors, lead to various changes and also form Gan disease. Long-term vomiting and diarrhea, or mistaken purgation by physicians, exacerbates deficiency and fluid loss with irritability, also forming Gan disease. Pediatric Pi disease arises from undigested milk and food stagnating in the abdomen, causing alternating cold and heat, incessant thirst, or wheezing and coughing, resembling tidal fever. If not treated early, it inevitably becomes Labor Gan (consumptive Gan). Because the Pi syndrome prevents eating, Spleen and Stomach deficiency generates heat, leading to thirst. Excessive drinking washes away Stomach fluids, impairing the transformation and transportation of water and grain. The pulse is deep and fine, further preventing intake, leading to Spleen and Stomach decline, inability to move the limbs, generation of various pathogens, emaciation, and formation of Gan disease. [Yang Shiyin] For children under twenty years old, the disease is called Gan; for those over twenty, it is called Lao (Consumption). Gan and Lao both result from exhaustion of Qi and Blood and damage to the intestines and stomach; they share the same origin but have different names. Why? Children's Zang-Fu organs are delicate; overeating easily causes injury. If milk feeding and diet are irregular, few escape developing Gan disease. Gan disease is caused by irregular milk and food intake and uncontrolled consumption of sweets and fats. In infants lacking milk or introduced to porridge too early, depletion of form and Qi creates the root of Gan. After two or three years, if milk and food intake is excessive and uncontrolled, Gan results from injury. Indulgence in sweets, fats, sticky foods, raw/cold/salty/vinegary items blocks the Middle Jiao, causing Gan due to accumulation. If the nursing mother fails to regulate temperature and diet, or experiences emotional turmoil or sexual activity before breastfeeding, Gan can transmit via maternal Qi. Is this not the fault of the family failing to adjust properly? Gan disease is fundamentally a Spleen-Stomach disorder with internal fluid depletion. It can arise from post-vomit/diarrhea mistaken purgation causing fluid exhaustion; from tidal fever and uncontrollable diarrhea causing Stomach dryness; from excessive cold purgation in Shanghan interior syndrome leading to thirst, heat generation, and subsequent pathogenic invasion; or from Pi disease with harsh purgatives causing sudden fluid injury. These are faults of physicians using light-minded treatments. Manifestations of Gan include shiny/tight scalp, sparse/brittle hair, retracted cheeks/dry nose, craving food/white lips, dim/cloudy eyes, rubbing nose/frowning, hunched spine/yellow body, grinding teeth/biting nails, intense thirst/sweating, white urine/sour stool, abdominal distension/bowel sounds, Pi accumulation/tidal fever, craving for fruits/sweets/salts/clay/soil/water—all are signs.

[Liver Gan], also known as Wind Gan or Sinew Gan. [Qian Yi] Liver Gan presents with white membrane covering the pupil; Sinew Gan presents with bloody diarrhea and emaciation. [Tang Shi] Liver Gan presents with bluish-white sclera and itchy/gritty eyes. *Shenghui Fang* describes head-shaking, eye-rubbing, generalized sweating, sleeping face-down, greenish-yellow complexion, bristly hair/scorched scalp, cyanotic sinews/hot brain, generalized sores/ringworm, abdominal accumulations, frequent dysentery, chronic non-healing, progressing to severe emaciation. [Zeng Shi] Eye discharge, bluish or white patches on hairline/left cheek, slightly yellow sclera, watery diarrhea or moss-colored stool.

[Heart Gan], also known as Fright Gan. Qian Shi notes yellow face/red cheeks and high fever. Tang Shi notes oral ulcers. *Shenghui Fang* describes generalized high fever, irregular vomiting/diarrhea, red cheeks/yellow face, chest/diaphragm oppression, dry nose/restless heart, oral/tongue ulcers, chronic dysentery with pus/blood, nocturnal sweating, or false fright. Yang Shi notes red/astringent urination and heat in the five centers. Zeng Shi notes teeth-grinding, tongue-protrusion, preference for cold water, and lying prone on the floor.

Spleen Gan is also known as Food Gan. Qian Shi notes yellow face, distended abdomen, and pica (eating dirt). Tang Shi notes indigestion for Spleen Gan and frequent vomiting for Stomach Gan. *Shenghui Fang* describes prominent abdominal veins, rapid breathing/coarse breath, poor appetite, chest/abdominal fullness, frequent crying/coughing/reversal of Qi, sallow complexion, bony prominence/brittle hair, emaciated/poor strength, chest oppression, undigested food, dry mouth/nose, depressed mood, preference for darkness/fear of light, Spleen-Stomach disharmony, frequent sour-smelling stools. Zeng Shi notes preference for cold food/drinks, excessive thirst, yellowish skin/hair, sparse hair tufts, large head/small neck, abdominal distension/weak legs, intermittent loose stools, thin muscles/lazy eyes, cool days/hot nights, lack of appetite. Qian Shi adds: Fei Gan (Fatty Gan) is Spleen Gan, characterized by emaciation, sallow dry skin with sores. Signs vary: gritty eyes/white membranes, red lips/dry yellow/black skin, lying on cool ground/eating dirt, skin sores, green/white/yellow frothy stools, color-changing watery diarrhea/easy abdominal distension, sores on body/ears/nose, hair tufts, large head/thin neck, extreme emaciation/thirst—all are symptoms. Note: These Spleen Gan signs overlap with other Gans because Gan is primarily a Spleen meridian disease.

Lung Gan is also known as Qi Gan. Qian Shi notes wheezing and oral/nasal ulcers. *Shenghui Fang* describes coughing/reversed Qi, dry/brittle skin/hair, excessive runny nose/frequent crying, throat obstruction, nose-rubbing/nail-biting, high fever/chills, red/itchy lip edges, abdominal distension, decreasing milk intake, Large Intestine dysfunction, frequent diarrhea with rice-like particles, millet-like skin bumps. Zeng Shi notes red/rotten skin under nose, thin/dry hands/feet, fishy breath, whiteness on right cheek.

Kidney Gan is also known as Urgent Gan or Bone Gan. Qian Shi notes extreme emaciation and skin sores for Kidney Gan; preference for cool ground for Bone Gan. Tang Shi notes black teeth/claws. *Shenghui Fang* describes emaciated muscles/bones, gingival ulcers, intermittent chills/fever, dry mouth/nose, burning brain sensation, icy cold feet, increased vomiting/decreased milk intake, frequent diarrhea, open lower orifice/incompetent anus, itchy/painful Gan sores. Zeng Shi notes sores inside/outside ears, crane-knee deformity, unfused fontanelles, delayed walking/tooth eruption, foul-smelling sutures, transmission to Running Horse Gan type.

[Yang Shiyin] Damage to the Five Zang organs by Gan is generally as described. Analyzing specifically: There are Gan arising from worms, Roundworm Gan, Spine Gan, Brain Gan, Dry Gan, Gan Thirst, Gan Diarrhea, Gan Dysentery, Gan Swelling, Gan Labor, Guwu Gan, Dingxi, and Bulu. Symptoms are numerous; we must summarize key points. Gan arising from worms: The source of Gan injury, though starting from irregular feeding, involves long-term stagnation in Zang-Fu transforming into worms. Worms may be thread-like or horse-tail-like, often appearing on head/neck/abdomen/back. Yellow/white/red worms are treatable; blue/black are difficult. Roundworm Gan: Caused by loss of milk, early solids, early meat consumption, or sweet/greasy stagnation transforming into roundworms. Signs: frowning/frequent crying, vomiting clear foam, intermittent abdominal pain, distended abdomen/blue veins, purple-black lips/mouth, anal/teeth itching (Note: Though roundworms eat filth, if worms move and exit mouth/nose, prognosis is poor). Spine Gan: Worms erode the spine. Signs: fever/emaciation/yellowing, heat from accumulation, irritability/warmth/dysentery, drum-like sound on back percussion, saw-toothed spine bones, sores on ten fingers, frequent nail-biting. Brain Gan: Congenital wind-heat, excessive breastfeeding post-birth. Signs: shiny/tight scalp, widespread crusty sores, burning brain sensation, matted hair, generalized sweating, swollen cheeks/high fontanelle (Note: Excessive maternal desire during labor also damages infant eyes). Dry Gan: Emaciated/blood-deficient/dry tongue/frequent crying—disease in Heart. Unblinking eyes/dry crying/few tears—disease in Liver. Fever/dry urine/cold extremities—disease in Kidney. Hoarse voice/dry skin/constipation—disease in Lung. Mouth-corner paralysis/sleepiness/chest-epigastric dryness/thirst—disease in Spleen. Collectively these are the Five Dry Gans. Gan Thirst: Pre-existing Gan Qi in viscera, compounded by nursing mother consuming pungent spices/alcohol/flour/fried foods, causing Heart-Lung heat congestion. Daytime: irritability/thirst/water seeking/poor appetite. Nighttime: thirst ceases. Gan Diarrhea: Dry hair/white lips/blue forehead lines/abdominal distension/bowel sounds/passing undigested matter (Do not use hot astringents). Gan Dysentery: Complicated by wind-cold-summerheat-dampness, cold-heat imbalance, or retained stagnation, failing to aggregate water/grain, frequently passing foul matter. Gan Swelling: Deficiency with accumulation; toxicity and Qi intertwine causing tight abdominal distension. Spleen absorbs dampness, causing puffiness of head/face/hands/feet (Treatment: Dissolve accumulation/regulate Qi). Gan Labor: Alternating tidal fever, heat in five centers, sores on palms/chest, nocturnal sweating/bone-steaming, cough/wheezing/emaciation. Or thirst followed by diarrhea, aversion to food/water, rock-hard abdomen, silver-colored face—untreatable. Guwu Gan: Nodules like beans behind ears/neck, movable/soft/painless, containing worm-like particles resembling rice flour. If not punctured quickly, worms scatter with heat flow, corroding viscera causing limb abscesses, purulent/bloody stools, high fever/emaciation, exposed skull bones (Treatment: Puncture and apply plaster). Also caused by washing children's clothes, exposing them eaves, contaminating them with bird feathers; child wearing such clothes allows worms into skin/hair. Sun-dried clothes must be warmed slightly. Dingxi: Extremely thin hands/feet, small neck/high bones, wasted buttocks/body, large abdomen/protruding umbilicus, crying with sunken chest, or grain-like nodules. Bulu: Alternating deficient heat, separated skull bones, regurgitation/vomiting worms, irritability/thirst/vomiting. Dingxi and Bulu result from long-term Spleen-Stomach deficiency failing to transform grain/water to nourish Qi/Blood, causing muscle wasting and Kidney Qi insufficiency, further injured by wind-cold, leading to withered bones. Also caused by congenital toxin/Zang-Fu blood deficiency. These are related to Guwu Gan; reaching this stage is perilous. Another case: Long-term Kidney Gan with internal deficiency/anorexia, severe case of Tianzhu Bone Collapse (collapsing neck). Treatment: Use Qian’s Dihuang Wan plus anti-Gan agents, apply neck-strengthening paste. Misidentifying this as Wuan Ruan (Five Softnesses) is incorrect. Tianzhu Bone Collapse has three types: 1. Long-term vomiting/diarrhea causing weakness; 2. Latent Liver/Gallbladder heat with red face/lips suddenly changing; 3. Shanghan failing to release exterior. All involve Wind pathogen entering Liver causing tendon relaxation. Vomiting/diarrhea types require regulating Stomach Qi; Liver heat types require cooling Liver based on severity; all use neck-strengthening paste. Only Shanghan-induced collapse is difficult to treat.

*Zhuang Family Transmission* lists 24 pediatric Gan presentations: 1. Purulent/bloody diarrhea, daily emaciation: Cold-Heat Gan. 2. Thin legs/high belly, sternum protrusion, craving dirt/sour-salty, generalized yellowing, vomiting/dysentery, abdominal pain: Spleen Gan. 3. Red/rotten skin under nose, eye-rubbing, bloody dysentery: Lung Gan (caused by hot foods, sick breast milk damaging Heart/Lung, cough, excessive cold meds causing upper heat/lower cold, drowsiness, day/night crying). 4. Loose/wrinkled skin, pale face, dry/itchy body, irritability. 5. Sparse hair, nasal sores: Lung Gan. 6. Head sores, sparse/brittle hair: Liver Gan. 7. Yellow/red unstable teeth: Kidney Gan. 8. Brittle/dry hair, nasal sores: Lung Gan. 9. Nail-biting, matted hair, heavy limbs: Heart Gan. 10. Abdominal veins, tooth erosion: Bone Socket Gan. 11. Vomiting/abdominal distension: Stomach Gan (also Milk Gan). 12. Broken/foul teeth, pale face, anorexia: Spleen Gan (also Mouth Gan). 13. Face-down sleeping, drunken sleep, distension/rapid breathing (due to raw meat ingestion, intestinal worms): Heart-Spleen Gan. 14. Dry/painful nose, bad breath, bleeding gums: Liver-Lung Gan. 15. Thin legs/high belly, blue abdominal veins: Spleen Gan. 16. Aseasonal sores, craving cold water: Heat Gan. 17. Millet-like skin bumps, rice in stool: Cold Spleen Gan. 18. Qi-fullness/abdominal distension/dry mouth: Heart-Stomach Gan. 19. Craving raw rice/flour/charcoal/bricks: Spleen-Stomach Gan. 20. Nose-rubbing/eye-rubbing/nail-biting/thirst: Liver-Thirst Gan. 21. Frequent chills/fever, reluctance to rise: Bone Heat Gan. 22. Thirst, eyes unable to open: Liver Gan. 23. Variable body temp, intermittent thirst: Urgent Gan. 24. Black gums, lazy/red lips: Heart Gan Accumulated Heat.

*Shenghui Fang* states: Gan internal presents with gritty eyes/abdominal distension, variable dysentery color (like rice wash), daily emaciation—treatable. If red/rotten skin under nose self-rubbed, nasal sore with crust/itch/pain spreading to ears, frequent red eyes, sparse hair, tight scalp, large head/small neck, emaciation—also treatable. If lips/mouth eroded, gums multicolored or jet black, white sores under tongue, palatal perforations, bad breath, rotting gums—treatable. If lower orifice open, red/rotten/unbearable itch, irregular dysentery—treatable. If Gan erodes spine, itchy fingers, self-nail-biting, matted hair, saw-toothed spine, intermittent distension/dysentery—urgent treatment ensures recovery.

*Shenghui Fang* states: Liver Gan with bluish veins in eyes, hard left hypochondrium, salivation, black qi around eye corners—untreatable. Heart Gan with fear/crying, constant thirst, craving pungent foods, temporal pulsation, black spots on tongue—untreatable. Spleen Gan with large belly/colorless lips, flat philtrum, endless dysentery, undigested food, pica, dry skin/exposed bones—untreatable. Lung Gan with reversed Qi/rapid breathing, white frothy diarrhea, millet-sized black spots on body—untreatable. Kidney Gan with craving sour/salty, excessive water, milky urine, black teeth, dry ears/brain, shrugging shoulders/withered bones—untreatable. Five Absolute Signs of Five Gans: 1. No pain when pressing middle toe sole. 2. Limp limbs when held. 3. Body not warm while illness persists. 4. Continuous green phlegm/frothy diarrhea. 5. Weak neck tendons. All untreatable; physicians must examine carefully.

[Luo Tianyi] Gan arises from Pi disease or long-term vomiting/diarrhea, where physicians wrongly administer turning drugs. Children’s constitution shifts easily between deficiency/excess, causing Stomach deficiency and fluid loss, internal deficient heat, external muscle wasting. One Zang deficiency weakens all others. Signs: eyelid swelling, abdominal distension, variable dysentery color, progressive emaciation, chronic non-healing. This is Wind accumulation in intestines/stomach; treat with Xuanfeng San (for vaccine fever) to guide, then tonify the mother organ of each affected Zang. [Qian Yi] All Gans should tonify the mother organ of the affected Zang and administer Gan-specific medicines: Cold type uses Muxiang Wan, Heat type uses Huhuanglian Wan. Gan internal with eye swelling/abdominal distension/variable stool color/frothy green-white stool/progressive weakness is Cold type; treat with Shijunzi Wan. Gan external with foul/rotten skin under nose/self-rubbing, nasal sore without crust spreading to ears: Treat nasal rot with Lanxiang San, general sores with Baifen San. Liver Gan: Tonify Liver with Dihuang Wan. Heart Gan: Tonify Heart with Anshen Wan. Spleen Gan: Tonify Spleen with Yihuang San. Kidney Gan: Tonify Kidney with Dihuang Wan. Sinew Gan: Tonify Liver with Dihuang Wan. Lung Gan: Tonify Spleen-Lung with Yihuang San. Bone Gan: Tonify Kidney with Dihuang Wan. Generally, distinguish Gan by Cold/Heat and Fat/Thin. Early stage: Fat-Heat Gan. Late stage: Thin-Cold Gan. Cold: Muxiang Wan. Heat: Huhuanglian Wan. Mixed Cold-Heat: Rusheng Wan (for Gan diarrhea). Children’s organs are tender; do not use harsh purgatives which deplete fluids and cause Gan. If purgation is needed, dose according to size/deficiency-excess to avoid Gan. Early stage with low fluids: Generate Stomach fluids with Baizhu San; more is better. [Yang Shiyin] Cool the Heat, Warm the Cold, Warm/Cool the Mixed. This is essential. Heat Gan: Disease mostly external, red/rotten skin under nose, wet/urgent head sores named Gan Xu (Deficiency). Frequent dysentery named Gan Ji (Accumulation). Heat in five centers named Gan Re (Heat). Brittle hair/matted hair/distended abdomen/blue veins/craving foreign objects named Gan Ji (Extreme). Alternating fever/withered body/pale face/no blood color named Gan Lao (Labor). Thin hands/feet/long neck/exposed bones/wasted buttocks/distended abdomen/protruding umbilicus named Dingxi. Increased vomiting/regurgitation/separated skull/thirst/worms from mouth named Bulu. These are all Gan signs. Also, excessive raw/cold/sweet/sticky/fatty foods cause Middle Jiao stagnation; long-term also...