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(The hanging part of the penis) belongs to the Foot-Jueyin Liver Meridian (Zu Jueyin Gan Jing). *Suwen* states: The Jueyin meridian runs through the genitalia and connects with the liver; therefore, one may experience irritability, fullness, and retraction of the scrotum. Zhang Zhongjing stated: In cold damage diseases, on the sixth day, when the Jueyin is affected, it results in tongue curling and testicular retraction. *Ling Shu* states: Jueyin refers to the Liver meridian. If the meridian fails to nourish, tendons become tight; tight tendons pull on the tongue and the testes, resulting in cyanotic lips, a curled tongue, and retracted testes. It further states: The penis and scrotum are the reservoirs within the body, indicators of Yin essence, and pathways for fluids. Thus, if diet, emotions, or daily activities are irregular, fluids overflow internally and accumulate downward in the testes. This leads to blocked blood channels, causing progressive enlargement without cessation, making bending and turning difficult, and hindering running and walking.

(The testicles, also known as the "Yin Wan") belong to the Foot-Jueyin Liver Meridian (Zu Jueyin Gan Jing). *Ling Shu* states: The collateral branch of the Foot-Jueyin ascends along the penis to the testes, where it knots at the penis. If Qi rebels in this channel, it causes sudden swelling of the testes and acute hernia (Shan); in excess conditions, it manifests as persistent erection; in deficiency conditions, it manifests as sudden severe itching. *Suwen* states: When pathogenic factors invade the collaterals of the Foot-Jueyin, they cause sudden hernia and acute pain. Zhu Danxi stated: Hernia refers to urgent pain connecting the testes and the lower abdomen. Some pain is located in the testes, while other pain is located two cun below the Dai Mai (Girdle Vessel), beside the Wushu (GB26) acupoint. Some present without shape or sound, some have a shape like a melon, and some produce sounds like frogs; all these are manifestations of hernia. These conditions are specifically related to the Liver Meridian and have absolutely no connection with the Kidney Meridian. Since *Suwen*, physicians have generally attributed them to Cold. However, Cold governs contraction and pulling; when meridians encounter Cold, they contract and stagnate, thus causing pain. One must realize that this condition originates from Damp-Heat stagnating in the meridian over a long period, compounded by external Cold binding the exterior, preventing dispersion, thereby causing pain. If one merely attributes it to Cold, the analysis is incomplete. It is common to see individuals who wade in water or swim throughout their lives without suffering from this disease, because they lack internal Heat. One might ask: How does Damp-Heat accumulate in the Jueyin Meridian? The answer is: Excessive labor generates Fire in the Spleen; drunkenness and overeating generate Fire in the Stomach; sexual exhaustion generates Fire in the Kidney; and extreme anger generates Fire in the Liver. After Fire accumulates for a long time, the Zi organ (Liver) weakens the Mu organ (Kidney), leading to an abundance of Dampness. Turbid fluids condense, merge into the blood vessels, and flow into the Jueyin. The Liver is called the "General"; its nature is rapid, and Fire nature is violent. Constrained by Cold, the pain naturally arises urgently.

(The testicular region) also belongs to the Foot-Shaoyin Kidney Meridian (Zu Shaoyin Shen Jing). Miao Zhongchun stated: Hernia is caused by Kidney Deficiency, allowing Cold-Damp pathogens to invade due to the void. Zhu Danxi’s assertion that it has nothing to do with the Kidney is not entirely accurate. However, there are cases where the disease begins with Dampness and later transforms into Damp-Heat; in such instances, medication should distinguish between treating Cold and Heat in sequence, which is the appropriate approach.