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The *Classic of Difficult Issues* (Huangdi Neijing) states: "When Qi is disordered in the Heart, it generates 'Fan' (restlessness/irritability)." Generally, when heat pathogens lodge in the Lung, 'Fan' arises; when they enter the Kidney, 'Zao' (agitation/restlessness) arises. Broadly speaking, when Heart Fire is hyperactive, it leads to a deficiency of Kidney Water and the scorching of Lung Metal, leaving only Fire blazing alone. Thus, the Lung and Kidney combine to produce both Fan and Zao.

When Fan and Zao occur simultaneously, some cases belong to Heat patterns, while others belong to Cold patterns. Ancient sages treated cases of isolated Fan without Zao as mostly belonging to Heat; only those with palpitations accompanied by Fan belong to Deficiency-Cold patterns. Cases of isolated Zao without Fan are mostly attributed to Cold; only those with hyperactive Fire and a full pulse belong to Heat. Generally, "Fan" refers to chest distress, indicating internal heat. "Zao" refers to physical agitation of the body and limbs, or nakedness with a desire not to be near clothing, or even a desire to jump into a well, representing rootless external false heat. In such cases, hot medicines such as Fuzi (Aconite Lateralis Radix Praeparata), Lizhong Tang (Regulate the Middle Decoction), Sini Tang (Frigid Extremities Decoction), and Jiang-Fu (Ginger and Aconite) preparations should be urgently administered. If mistakenly identified as Heat and cooled medicines are administered, the fire throughout the body will rise and scatter upon contact with water, leading to panting and sweating within moments, resulting in death due to the collapse of Yang Qi from the exterior.

For all cases where exterior syndromes fail to produce sweat, presenting with internal and external heat plus restless agitation, inducing sweat will resolve the condition. For interior excess-heat stagnation with constipation, regardless of whether it is Shanghan (Cold Damage) or miscellaneous diseases, if there is mental unrest and a rapid, full, and forceful pulse, purgation will resolve the condition. When Fire pathogens lodge in the Pericardium, or in individuals accustomed to alcohol and rich/greasy foods, causing turbidity in the Upper Jiao which leads to Fan and Zao, cooling herbs such as Huangqin (Scutellariae Radix), Lianzi (Corydalis Rhizoma), and Zhizi (Gardeniae Fructus) should be used as sovereign drugs, with slightly processed Shengjiang (Zingiberis Rhizoma) used as an attendant guide. In severe cases, Liangge San (Cool the Diaphragm Powder) may be used for purgation. If fever persists after sweating or purging, leading to mania, Fan, Zao, red face, and sore throat, this indicates Heat invading the Shaoyin (Lesser Yin) meridian. Tingli Kujiu Tang (Descurainia Seed and Vinegar Decoction) can be used to induce vomiting via probing.

The *Classic of Difficult Issues* states: "The summer pulse corresponds to the Heart." If the pulse is deficient (not reaching normal strength), it causes heart vexation. Liver deficiency, Kidney deficiency, and Spleen deficiency all cause heavy body weight and inner vexation/oppression. From this, we know that Fan often arises from Deficiency patterns. The general principle is: When fluids are excessively depleted, causing dryness in the five zang organs and resulting in Fan, Bazhen Tang (Eight Treasures Decoction) with Zhuye (Bambusae Folium), Zaoren (Ziziphi Spinosomi Semen), and Maidong (Ophiopogonis Radix) should be used. When Ying (Nutrient) Blood is insufficient, with Yang hyperactivity and Yin weakness causing Fan, Danggui Buxue Tang (Angelica Sinensis and Astragalus Decoction) administered with Zhusha Anshen Wan (Cinnabar Calming the Spirit Pill) is appropriate. Alternatively, Shengmai San (Generate the Pulse Powder) with Danggui (Angelicae Sinensis Radix), Dihu (Rehmanniae Radix), Zaoren (Ziziphi Spinosomi Semen), and Zhuru (Bambusae Caulis in Taenia) may be used. When Kidney Water is exhausted at the bottom and Heart Fire flares upward causing Fan, a large dose of Shengliu Wei Wan (Six Ingredient Pill with Rehmannia) should be used, with a small amount of Rougui (Cinnamomi Cortex) as a guiding agent.

For obese individuals suffering from Deficiency-Vexation, characterized by insomnia and no thirst, Wendan Tang (Warm the Gallbladder Decoction) is indicated. After a major illness, if residual heat remains with vomiting, cough, and reverse flow, causing Deficiency-Vexation and unrest, Zhuye Shigao Tang (Bamboo Leaf and Gypsum Decoction) is used. For five-palm heat (heat in palms, soles, and chest), dry mouth, dry lips, and chest heat/stuffiness, Qianjin Zhuye Tang (Million Gold Bamboo Leaf Decoction) is prescribed. For Deficiency-Vexation with deep restlessness, tossing and turning, Zhizi Chi Tang (Gardenia and Fermented Soybean Decoction) is used; if ineffective, Xijiao (Rhinocerotis Cornu - note: substitute with Buffalo Horn in modern practice) and Heishen (Polygoni Multiflori Preparata) are added. For lingering residual heat from chronic illness causing Deficiency-Vexation, unrest, and sleep disturbance, Liuwei Wan (Six Ingredient Pill) with Zaoren is used. For Fan accompanied by difficult urination, Wuling San (Five-Ingredient Powder with Poria) with Chencha (Cinnabaris) and Huashi (Talcum) is indicated. For Fan accompanied by vomiting and loss of appetite, Jingui Jupi Zhuyu Tang (Golden Cabinet Tangerina Peel and Bamboo Node Decoction) is used. Various types of Fan during pregnancy and postpartum are discussed in the Women's Diseases section.