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(The heart governs the Shen (Spirit), and the blood serves as the foundation for the Shen. When Heart Blood is deficient, the Shen loses its residence, leaving the Heart Palace empty, allowing Phlegm and Fluid retention to invade; this is the origin of Jing Ji (Palpitations with Fright). "Jing" refers to a state of apprehension and unrest, where one becomes easily depressed upon encountering events; Qi stagnation generates Phlegm. "Ji" refers to the palpable pounding sensation in the chest, caused by Heart deficiency leading to Water retention. Since Water occupies the Fire position (the Heart belongs to Fire), the Heart fears it, resulting in Zheng Chong (Severe Palpitations) and an inability to feel at ease.)

In Tai Yang disease (Exterior Syndrome of the Tai Yang channel), after eight or nine days, if purgatives are mistakenly used, symptoms such as chest fullness, irritability, fright, difficulty in urination, delirium, and heaviness of the entire body may occur. (Apply Chai Hu Jia Long Gu Mu Li Tang [Bupleurum Decoction with Dragon Bone and Oyster Shell]) If sweating is forced by fire therapy, leading to the loss of fluids, (apply Zhi Gan Cao Tang [Honey-Fried Licorice Decoction]). In Tai Yang disease, if sweating fails to resolve the condition, accompanied by fever, palpitations, dizziness, muscle twitching, and trembling as if about to fall to the ground, (apply Zhen Wu Tang [True Warrior Decoction]). In Shao Yang disease (Exterior-Interior Syndrome of the Shao Yang channel), presenting with deafness, red eyes, irritability, and fullness, emetics and purgatives must not be used; if mistakenly applied, they will cause palpitations and fright. (Apply Jiu Ni Xiao Chai Hu Tang [Rescue the Perilous Bupleurum Decoction], which is Xiao Chai Hu Tang minus Huang Qin [Scutellaria Root] plus Fu Ling [Poria]) After five or six days, presenting with alternating chills and fever, chest and hypochondriac fullness, silent demeanor with loss of appetite, irritability and palpitations, frequent vomiting, slight fever, or cough, (apply Xiao Chai Hu Tang [Minor Bupleurum Decoction]). With a wiry and fine pulse, headache, and fever, the syndrome belongs to Shao Yang; sweating is contraindicated. If sweating is induced, delirium occurs, Stomach disharmony ensues, leading to irritability and palpitations. (Apply Tiao Wei Cheng Qi Tang [Regulate the Intestines and Direct Downward Decoction]). In Shao Yin disease (Interior Deficiency-Cold Syndrome of the Shao Yin channel), presenting with cold extremities and palpitations, or difficulty in urination, abdominal pain, or diarrhea, (apply Si Ni San [Four Counterflow Powder]). For cold extremities accompanied by palpitations, water retention should be treated first. (Apply Fu Ling Gan Cao Tang [Poria and Licorice Decoction]). In Huo Luan (Vomiting and Diarrhea Syndrome) with palpitations, (apply Li Zhong Wan [Regulate the Middle Pill] plus Fu Ling [Poria]).

Note: Although Jing (Fright) and Ji (Palpitations) are distinct, both ultimately stem from injury to the Heart. Due to internal weakness of Yang Qi, the treatment method should focus on anchoring and consolidating. Due to the retention of Fluids, the treatment method should focus on unblocking and draining. The harm caused by Fluid retention is significant; how much more so for other conditions?

("Zhen" refers to slight trembling of the body, caused by deficiency-cold of the Righteous Qi; "Zhan" refers to severe shaking of the body, caused by the struggle between Pathogenic factors and Righteous Qi; "Li" refers to inner trembling/fear, caused by Pathogenic factors overcoming Righteous Qi. "Zhen" is mild, while "Zhan" is severe; "Zhan" manifests externally, while "Li" manifests internally.)

After vomiting or purging, if there is fullness below the heart, Qi rushing upward, dizziness, and a deep-tight pulse, inducing sweating will disturb the meridians, causing the body to tremble and shake. (Apply Fu Ling Gui Zhi Bai Zhu Gan Cao Tang [Poria, Cinnamon Twig, Atractylodes Macrocephala, and Licorice Decoction]). In Tai Yang disease, if fever persists after sweating, accompanied by palpitations, dizziness, muscle twitching, and body trembling, (apply Zhen Wu Tang [True Warrior Decoction]).

Note: The Classics state that purging followed by repeated sweating, or sweating mistakenly administered to patients who have lost blood, will inevitably lead to cold trembling due to deficiency in both interior and exterior. It is also said that when Exterior Qi is slightly deficient and Interior Qi cannot hold fast, Pathogenic factors invading the Yin aspect cause trembling. Thus, it can be known that symptoms of trembling and shaking largely belong to deficiency. The Su Wen states: "When Cold Pathogens injure the person, it causes all hair follicles to stand erect and the jaw to chatter and tremble." This indicates that since Pathogens are already present within, sweating should be induced to release them. Zhang Zhongjing states: "If the pulse is floating and tight, but feels hollow (Kou) upon pressure, this indicates fundamental deficiency; the disease should resolve through trembling and sweating." Furthermore, if the pulses at the three positions (Cun, Guan, Chi) are equal in floating/sinking, slow/rapid characteristics, the disease will also resolve through trembling and sweating. If the pulse is floating and rapid, but does not feel hollow upon pressure, and the patient is not deficient, the disease will resolve through spontaneous sweating without trembling. If there is no external trembling but only internal trembling, it indicates that the Yin aspect has been invaded by Pathogens. Generally, when Tai Yang disease is about to resolve, trembling precedes sweating, indicating that Pathogenic factors cannot overcome Righteous Qi. If Righteous Qi cannot overcome Pathogenic factors, even if trembling occurs without sweating, the condition is untreatable.