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The *Bingji Shi Yao* (Essentials of Pathogenesis) states: Fever accompanied by exterior syndrome is called exterior heat (Wai Re, Exterior Heat); fever without exterior syndrome is called interior heat (Li Re, Interior Heat). Sudden onset of fever results from prolonged stagnation and lack of circulation.
Fever induced by taking warm-natured medicines, or fever accompanied by aversion to cold and shivering, are generally manifestations of Heart Fire (Xin Huo, Heart Fire) among various heat syndromes.
The treatment principles are: For mild heat, use cool-natured herbs to harmonize it; for severe heat, use cold-natured herbs to eliminate it; for extreme heat, induce sweating to release it. If sweating does not fully resolve the condition, employ reverse restriction methods. If reverse restriction fails, seek the root affiliation (e.g., guiding fire back to its source) to weaken the pathogenic factor.
Bitter herbs treat diseases of the Zang organs (Zang Organs, Yin organs), as the Zang organs belong to Yin and reside internally. Acrid herbs treat diseases of the Fu organs (Fu Organs, Yang organs), as the Fu organs belong to Yang and reside externally.
Therefore, internal conditions are treated internally, and external conditions are released through dispersion.
It is also beneficial to nourish blood and benefit Yin; in this way, the heat will resolve spontaneously without direct treatment.

Yang Shiyi stated: Among pediatric diseases, heat syndromes are predominant.
Heat syndromes are categorized into tidal fever (Chao Re, Tidal Fever), fright fever (Jing Re, Fright-induced Fever), night fever (Ye Re, Night Fever), residual heat (Yu Re, Residual Heat), food-heat (Shi Re, Food-induced Heat), gan-heat (Gan Re, Malnutrition-related Heat), vigorous fever (Zhuang Re, High Fever), vexatious heat (Fan Re, Vexation-related Heat), accumulation heat (Ji Re, Accumulation Heat), wind-heat (Feng Re, Wind-induced Heat), deficiency heat (Xu Re, Deficiency Heat), guest heat (Ke Re, Guest-like Fever), mass-heat (Pi Re, Mass-related Heat), chills-and-fever (Han Re, Chills and Fever), blood-heat (Xue Re, Blood Heat), and rash-heat (Zhen Zhen Re, Rash-related Heat). These sixteen types share commonalities with minor differences.
The initial onset of heat must have a cause.
Tidal fever occurs and subsides at specific times; fright fever presents with screaming and trance-like states; night fever often ceases in the morning; residual heat indicates incomplete elimination of cold pathogens; food-heat initially manifests as abdominal discomfort; gan-heat presents with bone-steaming and night sweats; vigorous fever persists continuously; vexatious heat involves mental restlessness; accumulation heat shows red cheeks and mouth ulcers; wind-heat features sweating and body heat; deficiency heat causes fatigue and weakness; guest heat comes and goes unpredictably; phlegm-heat involves coughing up saliva and drinking water; chills-and-fever resembles malaria; blood-heat occurs during the Chen and Si hours (09:00–13:00); rash-heat presents with cold ears and nose tips.
These syndromes have their respective locations. Occasionally, two or three syndromes may interact; treatment should be prescribed according to the severity.

Heart Heat: Observe if the child’s breath is warm during sleep, if they sleep face down, or exhibit upward-gazing eyes, head shaking, and teeth grinding. The primary formula is Xiexin Tang (Coptis Decoction).
Liver Heat: Manifests as grasping clothing collars and fidgeting. The primary formula is Xieqing Wan (Draining Green Pill).
Vigorous Fever with thirst, asthma, and chest oppression: The primary formula is Xiebai San (Draining White Powder).
Spleen Heat: Heat resides in the muscles, worsening at night. Symptoms include lethargy, desire to lie down, body heat, thirst, and flaccidity of the four limbs. The primary formula is Xiehuang San (Draining Yellow Powder).
Lung Heat: Manifests as pinching eyebrows and eyes, worsening heat in the evening, asthma, cough, chills and fever, and high fever with thirst. Mild cases are treated with Xiebai San (Draining White Powder); severe cases with Liangge San (Cooling Pagoda Powder).
Kidney Heat: The feet dislike being covered. This is because the area below the navel is governed by the Kidneys, due to Heart Qi descending to the Kidney region. The primary formula is Dongyuan Zishen Dihuang Wan (Dongyuan’s Nourishing Kidney Rehmannia Pill).

Tidal Fever: Caused by Cold Damage or epidemic pathogens transforming, leading to insufficient Yin and excess Yang. Violent injury by Yang pathogens causes Qi and Blood stagnation, failing to circulate immediately, resulting in rebellion and lack of direction, transmitting to the Foot-Yangming Meridian, thus generating tidal fever occurring twice daily like the tide.
The *Shanghan Lun* (Treatise on Cold Damage) states: Tidal fever indicates excess heat; one should promote bowel movements. If the pulse is solid, use Dachi Hu Tang (Major Bupleurum Decoction) to purge; if the pulse is deficient, floating, and rapid, use Baijie San (Hundred Releases Powder) to sweat.

Fright Fever: Generalized fever, cyanotic complexion, spontaneous sweating, palpitations, rapid pulse, irritability, and trance-like screaming. The primary formulas are Qianyi’s Liangjing Wan (Cooling Fright Pill) and Anshen Wan (Calming Spirit Pill).
Night Fever: Fever occurs only at night, indicating Yang pathogens within Yin. The primary formula is Yuanrong Siwu Erlian Tang (Yuanrog’s Four Substances with Two Lians Decoction).
Residual Heat: Refers to lingering heat after incomplete transmission of cold pathogens.
Renzhai stated: After sweating or purging in Cold Damage, if fever recurs, it indicates deficiency in both exterior and interior, with Qi failing to return to its origin and Yang floating outward. Cool herbs should not be used again, as eliminating heat may invite cold, a warning from ancient masters. The method is to harmonize Stomach Qi, allowing Yang Qi to converge and return inward, stopping the fever naturally. The primary formula is Shenling Baizhu San (Ginseng, Atractylodes Macrocephala, Poria, and Licorice Powder).

Food Heat: Heat in palms, heat starting in the back, belching, vomiting milk, and sour-smelling stool. The primary formula is Xiaji Wan (Expelling Accumulation Pill).
Gan Heat: Emaciation, excessive thirst, poor weight gain despite eating, bone-steaming, night sweats, irregular diarrhea, distended abdomen, and weak legs. Formulas include Longdan Wan (Gentian Pill), Huhuanglian Wan (Coptis Pill), and Lushui Wan (Aloe Pill).
Vigorous Fever: Persists continuously. Due to congestion of Qi and Blood and heat generated in the Five Zang Organs steaming internally, causing restless sleep and trance-like spirit; steaming externally causing interior-exterior heat, irritability, and coarse breathing, potentially leading to convulsions and epilepsy. The primary formulas are Huofu San (Fire Mansion Powder) and Tongsheng San (Universal Benefit Powder).
Vexatious Heat: Mental restlessness, heat in the five centers (palms, soles, chest), warm and hot limbs, and dark, scanty urination. The primary formula is Yili Jindan (One-Pill Golden Elixir).
Accumulation Heat: Red cheeks and mouth ulcers. Excess type presents with swollen waist and legs; interior-exterior excess presents with body heat and difficult urination; deficiency type presents with persistent fever after sweating/purging. Causes include internal factors like alcohol, fried foods, harsh heat-clearing drugs, or over-tonification, and external factors like exposure to intense heat sources. This is accumulated heat from internal and external sources, distinct from food stagnation heat. The primary formulas are Sanhuang Wan (Three Yellows Pill) and Sishun Yin (Four Smooth Decoction).
Wind Heat: Sweating, body heat, yawning, red face. Caused by open pores allowing Wind pathogens to invade the skin and hair, entering the Zang-Fu, leading to aversion to wind, fever, dry eyes, and hypersomnia. Excess Yang causes body heat without sweat; excess Yin causes cold with sweat; excess Yin and Yang causes cold without sweat. The *Suwen* states: Sweating with body heat is Wind Heat. The primary formulas are Xiaofeng San (Eliminating Wind Powder) and Luxia Wan (Green Mist Pill).

Deficiency Heat: Occurs after sweating/purging in Cold Damage or other heat syndromes, leading to excessive loss of Body Fluids, unregulated Qi and Blood, and damage from diet or labor. Symptoms include fatigue, pale-green complexion, diarrhea, polyuria, spontaneous sweating, trance-like state, lethargy, and weak Qi. It also includes sequelae of chronic cough, diarrhea, dysentery, hematochezia, or malaria.
Prolonged illness leads to Qi and Blood deficiency. Qi deficiency causes syncope; Blood deficiency causes fever; combined deficiency causes cold extremities with body heat. The primary formulas are Xingxing San (Awakening Powder), Sijunzi Tang (Four Gentlemen Decoction), and Qianyi Baizhu San (Qianyi’s Atractylodes Powder).

Guest Heat: Yang pathogens invading the Heart. If the Heart is affected, heat appears on the forehead, starting in the head and face, then spreading to the body with fever, trance-like states, and startle response to sound. This is due to deficiency of True Qi and excess of pathogenic factors. The struggle between pathogen and True Qi causes intermittent thirst and unpredictable progression, resembling a guest’s visit, hence "Guest Heat." The primary formulas are Daochi San (Guiding Out Red Powder) and Huanglian Xiexin Tang (Coptis Draining Heart Decoction).
Mass Heat: Coughing up saliva and drinking water, caused by undigested milk and food stagnating internally, forming masses. Use Baizhu San (Atractylodes Powder) to nourish fluids, and Zhenzhu Wan (Pearl Pill) to purge phlegm, or Hezi Wan (Brown Seed Pill).

Chills and Fever: Resembles malaria, indicating mutual victory/defeat of Yin and Yang. Chills preceding fever indicates Yang deficiency; fever preceding chills indicates Yin deficiency. More chills than fever indicates Yin overcoming Yang; more fever than chills indicates Yang overcoming Yin. Equal chills and fever indicate Yin-Yang conflict; every-other-day episodes indicate Yin-Yang separation. Yang excess causes fever; Yin excess causes chills.
Symptoms may include headache with sweating, vomiting/anorexia, increased chills with thirst, high fever with desire for hot drinks, bone/joint pain, diarrhea or constipation, interior cold/exterior heat, or interior heat/exterior cold. Abdominal pain with cold indicates food stagnation; abdominal borborygmi with heat indicates food stagnation.
Treatment: For food stagnation, use Baibing Zi (White Cake Pills) to purge, followed by tonification with Qianyi Baizhu San. For more chills than fever, use Xiao Chaihu Tang (Minor Bupleurum Decoction) plus Guizhi (Cinnamon Twig). For more fever than chills, use Baihu Tang (White Tiger Decoction) plus Guizhi. For equal chills and fever, use Xiao Chaihu Tang.

Blood Heat: Fever during Si and Wu hours (09:00–13:00), cooling at night. The primary formula is Liuhe Tang (Six Harmonies Decoction).
Rash Heat: Cold ears and nose tips. Formulas include Renshen Baidu San (Ginseng Detoxifying Powder), Shengma Gegen Tang (Cimicifuga and Kudzu Decoction), and Suxu Yin (Ginseng and Perilla Drink).

Commentary: The above discussion of heat syndromes is comprehensive. The difference between Quan Ying Fang’s description of Blood Heat (fever at Si/Wu hours, cooling at night) and Dongyuan’s statement ("fever at night, clear during day") lies in their definitions. Dongyuan’s Blood Heat refers to internal heat generated by Yin deficiency, aligning with the concept of night being Yin time. Zheng Shi’s Blood Heat refers to excess blood in children. Si and Wu hours are when Heart Fire is active; the Heart governs Blood. When Blood Qi reaches these hours, Yang Qi is abundant; the struggle between Yang Qi and Healthy Qi causes fever at this specific time. Fever outside these hours is not Blood Heat. Due to these differing theories, both are recorded.