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Yang qi deficiency in the lower part leads to Cold Jue (Cold Reversal Syndrome). Yin qi deficiency in the lower part leads to Heat Jue (Heat Reversal Syndrome). (When the Foot Three Yang meridians are full and Yin is abundant while Yang is deficient, Yin cold rises from below; thus, Cold Jue involves coldness extending from the toes up to the knees. When the Foot Three Yin meridians are full and Yang is abundant while Yin is deficient, Yang invades the position of Yin; thus, Heat Jue involves heat starting from the soles of the feet.)

Why does Cold Jue occur? The anterior yin region is where the Zongjin (Tendon Sinews) converge, and it is the junction of the Taiyin Spleen and Yangming Stomach meridians. In spring and summer, Yang qi is abundant and Yin qi is scarce; in autumn and winter, Yin qi is abundant and Yang qi is deficient. This person has a robust constitution but squanders their essence during autumn and winter (excessive sexual activity depletes Yin). The Qi from the lower body struggles upward and cannot return (Yang pulses against Yin, drawing Qi from below the waist upward, preventing it from returning to its meridians), essence leaks downward (Yuan essence drains downward), and pathogenic Qi follows it upward (Yang deficiency allows Yin cold to prevail as pathogen). These Qi accumulates in the middle (Qi refers to both essential Qi and pathogenic Qi, generated internally). Yang Qi is too weak to penetrate and nourish the collaterals and meridians; Yang Qi diminishes day by day, leaving Yin Qi alone, causing coldness in the hands and feet (The four limbs are the root of all Yang Qi).

How does Heat Jue occur? When wine enters the stomach, the Luo-connecting vessels become full while the Jing-main meridians become empty. The Spleen governs transporting fluids for the Stomach. If Yin Qi is deficient, Yang Qi enters (Damp-heat in the Spleen causes Yin deficiency and Yang hyperactivity). Once Yang Qi enters, the Stomach becomes disharmonious; when the Stomach is disharmonious, Essence and Qi are exhausted; when Essence and Qi are exhausted, they cannot nourish the four limbs (Spleen and Stomach disease together fail to generate Essence; Ying refers to nourishment). Such a person likely drinks heavily or engages in sexual intercourse after being full (damaging Spleen and Kidney). Qi gathers in the Spleen and cannot disperse; the aroma of wine and grain Qi contend with each other, generating intense heat in the center. Thus, heat pervades the body, causing internal heat and dark urine. Wine Qi is potent and fierce, causing Kidney Qi to decline daily, leaving Yang Qi dominant, resulting in heat in the hands and feet.

When a person suffers from Weiwanyong (Stomach Epigastrium Carbuncle), one must examine the Stomach pulse. A deep and fine pulse indicates rebellious Qi (the Yangming meridian is rich in Qi and Blood, so the pulse should be洪大 [surging and large]; if deep and fine, Qi is rebellious against normality). In cases of rebellion, the Renying (Renying Pulse, located at the carotid artery near the larynx, here referring to the pulse before the Guan position on the left hand) is very vigorous; vigor indicates heat (Rebellious Stomach Qi causes Renying pulse to surge, known as "Renying three times larger than Cunkou," indicating disease in the Yangming meridian). The Renying pulse reflects the Stomach meridian. Rebellion and vigor cause heat to accumulate at the gastric opening without dispersing, leading to the formation of a carbuncle in the epigastrium.

Some patients exhibit anger and mania, named Yang Jue (Yang Reversal). Treatment involves restricting their food intake until recovery. Food transforms into Yin essence, which generates Yang Qi; thus, restricting food cuts off the source of Yang Qi generation. Additionally, administer Shengtieluo Yin (Decoction of Raw Iron Filings). Shengtieluo (Raw Iron Filings) has a heavy, descending nature that rapidly lowers Qi (due to its cold and heavy properties, it descends Qi quickly. Furthermore, anger is associated with the Liver; when Liver Wood is excessive, Metal should subdue it).

Some patients present with fever, flaccidity and lethargy (Damp-heat damaging sinews), profuse sweating like bathing (Heat steaming the skin and muscles), aversion to wind, and shortness of breath (Wei Qi deficiency). This condition is called Jiufeng (Wine Wind, also known as Loufeng/Leaking Wind in the *Feng Lun* chapter). Use Zexie (Alismatis Rhizoma) and Baizhu (Atractylodis Macrocephalae Rhizoma) in equal parts (10 units each), and Mixian (Muxian/Vixian herb, also known as Wuxiancao, bitter, neutral, slightly cold, treating wind-dampness) in 5 parts. Mix them and take approximately three finger-widths (a small dose for decoction) after meals (Zexie promotes urination to leach out damp-heat; Baizhu dries dampness and stops sweating; Mixian dispels wind and removes dampness).