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The Wei (Micro) pulse is extremely fine, thin, and soft; upon heavy pressure, it feels as if it is about to disappear, seeming to exist yet not exist (from *Mai Jing*). Some describe it as fine and slightly long (Dai's view). It is referred to as "Xiao" (Small) in the *Su Wen*. When Qi and Blood are deficient, the pulse appears as Wei.

[Poem on Form and Similarities] The Wei pulse is slight and flickering; under heavy pressure, it seems to vanish, appearing non-existent. Wei indicates deficiency of Yang, while Xi (Fine) indicates deficiency of Yin. Xi is slightly coarser than Wei. If felt lightly but feels like it is about to cease under heavy pressure, it is Wei. If it flows back and forth like a thread but remains constant, it is Xi. Zhang Zhongjing stated: A pulse that flickers like fat floating on soup surface indicates weak Yang Qi; a pulse that winds like silk threads indicates declining Yin Qi. In chronic diseases, this pulse portends death; in acute diseases, it suggests survival.

[Poem on Main Diseases] When Qi and Blood are deficient, the pulse also becomes micro; symptoms include aversion to cold, fever, and profuse sweating. In men, it signifies extreme exhaustion and various deficiency syndromes; in women, it indicates conditions such as metrorrhagia and leukorrhea requiring treatment. At the Cun position, a Wei pulse may present with shortness of breath or palpitations; at the Guan position, a Wei pulse manifests as abdominal distension and fullness; at the Chi position, it indicates weakness of essence and blood, accompanied by aversion to cold, emaciation, thirst, pain, and groaning. Wei primarily governs diseases of chronic deficiency and weak blood. Weak Yang leads to aversion to cold, while weak Yin leads to fever. *Mai Jue* states: Prolonged duration can lead to excessive white leukorrhea, and prolonged leakage causes the bones to wither.

The Jin (Tight) pulse is forceful in its coming and going, striking the fingers from both sides (from *Su Wen*). It resembles a twisting rope, changing constantly (Zhang Zhongjing), rapid like cutting a rope (*Mai Jing*), or like stitches on a needle (Zhu Danxi). The Jin pulse arises because heat is constrained by cold pathogens, resulting in such urgency and rapidity, yet it must retain Shen Qi (Spirit/Energy). *Su Wen* refers to it as "Ji" (Urgent). *Mai Jue* says: Rarely reaching the Chi position. Cui Shi said: Like a thread. These descriptions do not accurately depict the Jin pulse. Some mistakenly identify floating-tight as Xian (Wiry) and sinking-tight as Lao (Deep-Firm), which are only approximate.

[Poem on Form] Light pressure feels like a twisting rope, heavy pressure feels like cutting a rope; thus the pulse obtains the name Jin. This is always caused by the invasion of Cold Pathogens, leading to abdominal pain internally and body pain externally.

[Poem on Similarities] See Xian (Wiry) and Shi (Excess).

[Poem on Main Diseases] Jin primarily governs pain due to Cold, as well as wheezing, coughing, wind-stroke epilepsy, and vomiting of cold phlegm. Floating-Jing indicates exterior cold, requiring diaphoresis (sweating method); Sinking-Jin indicates interior cold, which will naturally resolve with warming and dispersing methods. At the Cun position, differences between Renying and Qikou acupoints should be noted, concerning heavy pain in the heart and abdomen. Jin at the Chi position indicates Yin-Cold, definitely pointing to Ben Tun (Rushing Tumor) and Hernia pain. All Jin pulses indicate Cold and Pain. Renying pulse tight and excess indicates injury by Cold; Qikou pulse tight and excess indicates injury by food stagnation; Chi pulse tight indicates pain located in the abdomen. Furthermore, if the disease is in the abdomen. In Zhong E (Sudden Evil) presenting with Floating-Jin, or coughing presenting with Sinking-Jin, both portend death.