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The *Yuan Bing Shi* (Treatise on the Original Nature of Diseases) states: Lin syndrome (stranguria, characterized by painful and difficult urination) refers to urine that is astringent and painful. This occurs because heat pathogens lodge in the Bladder, causing stagnation and preventing normal seepage and excretion. Chao Yuan-fang in the *Zhu Bing Yuan Hou Lun* (Source Book of All Categories of Disease) says: All types of Lin syndrome are caused by Kidney deficiency. The Kidney and the Bladder have an interior-exterior relationship. When water enters the Small Intestine, passes through the Paom (urinary bladder/uterus region), circulates via the Yin organs to become urine, the Kidney Qi connects to the Yin organs, and the downward flow channel is thus established.

There are five named types of Lin: Gao Lin (paste stranguria), Leng Lin (cold stranguria), Re Lin (heat stranguria), Xue Lin (blood stranguria), and Shi Lin (stone stranguria).

Gao Lin manifests as fat-like paste floating on the surface of the urine; this is due to Kidney deficiency failing to control water, allowing fatty fluids to descend.

Leng Lin is preceded by shivering and chills before urination occurs. This is also due to Kidney deficiency with cold invading the Lower Jiao; cold qi enters the Paom and contends with healthy Qi, resulting in astringent urination accompanied by chills.

Re Lin arises from heat in the Lower Jiao; heat transmits to the Kidney, flows into the Paom, causing yellow, scanty, and astringent urine, occasionally mixed with fresh blood.

Xue Lin represents the extreme of heat. The Heart governs Blood, circulating externally in the meridians and internally in the Zang-Fu organs. When heat is excessive, blood loses its normal pathway. Since the Heart and Small Intestine have an interior-exterior relationship, heat flows downward and infiltrates the Paom, resulting in blood stranguria.

Shi Lin occurs because the Kidney governs water; when water coagulates, it transforms into stones. Generally, when the Kidney is attacked by heat, urination causes pain in the glans penis, preventing smooth flow. Pain radiates to the lower abdomen, and sand/stones are passed in the urine. Severe cases may involve cold-induced severe pain leading to fainting and confusion, followed by waking after profuse sweating throughout the body; this is caused by the pain itself.

Although the five types of Lin are said to stem from Kidney deficiency, the Small Intestine is the organ of reception and storage, connecting Qi to the Bladder; the Bladder is the organ of fluid metabolism, connecting Qi to the Stomach. If other transformed substances fail to flow downward smoothly, it is termed insufficient Kidney Qi. Heat entering the Bladder causes the water passages to become astringent and obstructed, leading to frequent and urgent urination, acute pain in the umbilical and abdominal regions, intermittent onset, or turbid urine resembling bean juice, paste, or blood. Treatment may employ Ju Fang Wu Lin San (Local Formula Five-Lin Powder), combined with Long Nao Ji Su Wan (Borneol Chicken-Su Pill) for natural resolution. Alternatively, Xiang Xiong Wan (Atractylodes and Ligusticum Pill) or Bu Shen Di Huang Wan (Kidney-Nourishing Rehmannia Pill) can be used for guidance and tonification, prioritizing tonification.

Zeng Shi stated: Infants suffering from urinary retention have two syndromes: Yin obstruction and Yang obstruction. Yin obstruction occurs when cold-dampness invades the interior due to deficiency, causing blockage, named Yin Bi. It can be treated with Bai Shao Yao Tang (White Peony Decoction) added with Nan Mu Xiang (Southern Costus Root), and applying hot fried salt wrapped in silk cloth to warm-moxibustion around the navel, while administering Wu Ling San (Five-Ingredient Powder with Poria) mixed with Ling Sha powder (Cinnabar and Sulfur preparation), taken with warm salt water on an empty stomach for rapid effect. Yang obstruction is caused by sudden heat forcing blockage, named Yang Bi. There is also Long Bi (difficulty in urination) which differs from Lin. The *Nei Jing · Xuan Ming Wu Qi Pian* (Inner Canon · Chapter on Five Qi Manifesting) states: Impaired function of the Bladder is called Long. Long refers to deficiency of Qi in the five internal organs, blocked by heat stagnation, failing to diffuse and transform. It is neither astringent nor painful, but simply closed and obstructed, with abdominal distension and tight fullness. Treatment involves finely chopped Wu Ling San added with Che Qian Zi (Plantago Seed) and Deng Xin Cao (Juncus Effusus), along with Mu Tong San (Akebia Powder), Yu Lu Yin (Jade Dew Drink), or Yi Yuan San (Benefit Origin Powder). Applying Jiang Chi Bing (Ginger and Fermented Soybean Cake) to the navel can also be effective. Regardless of Yin or Yang syndromes, all can be treated, and combining with Wan An Yin (Ten-Thousand Safety Drink) is particularly excellent.