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Chapter 13 of 28
濒湖脉学
This chapter discusses the faint pulse (an extremely thin and soft pulse that seems present yet absent), categorized under the Yin type pulses.
Mai Jing (The Pulse Classic) describes: The faint pulse is extremely thin and soft; when pressed, it seems about to cease, being present yet absent. Master Dai adds: The faint pulse is thin and slightly long. Su Wen (The Yellow Emperor's Classic of Internal Medicine) refers to this pulse as the "small pulse" and points out: When qi and blood are weak, the pulse manifests as a faint pulse.
The faint pulse beats lightly, like ripples floating on the surface of water 💨; when pressed, it seems about to cease—present yet absent. The faint pulse reflects yang qi (the driving force of warmth and propulsion in the body) deficiency, while the thin pulse reflects yin blood (the material basis for nourishment and moistening in the body) weakness; the thin pulse is slightly thicker than the faint pulse.
The key distinction: palpable with light pressure, seeming about to cease with firm pressure—this is the faint pulse; the pulse moves like a fine thread but remains consistently present—this is the thin pulse.
Zhang Zhongjing (the original text reads "Shen Jing") stated: A pulse that floats like oil slick on the surface of soup is a sign of yang qi weakness; a pulse that lingers like fine silk threads drawn from a silkworm cocoon is a sign of yin qi decline. For those with chronic illness, seeing this pulse portends an unfavorable prognosis; for those with acute illness (sudden onset), seeing this pulse actually indicates recovery—there is hope for restoration.
When qi and blood are weakened, the pulse becomes faint and thin; the patient may experience aversion to cold, fever, and profuse sweating. In men, this pulse often indicates extreme exhaustion (severe deficiency caused by overwork) and various deficiency syndromes; in women, it often indicates uterine hemorrhage (heavy vaginal bleeding outside of menstruation) and abnormal vaginal discharge (excessive or abnormal discharge) and other gynecological conditions.
The faint pulse generally indicates diseases of chronic deficiency and blood weakness. When yang qi is weak, there is aversion to cold; when yin qi is weak, there is fever. The Mai Jue (Pulse Secrets) adds: "With prolonged uterine bleeding, liver yin becomes exhausted; with prolonged vaginal discharge, the bone marrow withers."
The essence of the faint pulse is the extreme manifestation of "qi and blood decline" reflected in the pulse. The formation of the pulse depends on the movement and fullness of qi and blood. When qi and blood are extremely weakened, there is insufficient qi and blood within the vessels to produce a forceful beat, thus manifesting as an extremely thin, soft, present-yet-absent faint pulse.
Several key medical principles:
The faint pulse indicates deficiency, not excess: The faint pulse represents deficiency syndromes and is unrelated to pathogenic excess. The "present yet absent" quality reflects the depleted state of qi and blood, rather than obstruction by pathogenic factors.
The faint pulse distinguishes yin and yang: The faint pulse itself belongs to the yin category, but in terms of indicative diseases, it can differentiate yin from yang—yang deficiency manifests as aversion to cold (yang qi cannot warm the exterior, hence fear of cold), yin deficiency manifests as fever (insufficiency of yin blood leading to internally generated deficiency heat, hence fever). This aligns with the fundamental principle that "yang deficiency produces external cold, yin deficiency produces internal heat."
Differentiation between chronic and acute illness: Zhang Zhongjing proposed that "in chronic illness, encountering this pulse means death; in acute illness, encountering it means survival"—an important prognostic reasoning in Chinese medicine. In chronic illness, righteous qi is already depleted; seeing a faint pulse indicates that qi and blood are nearly exhausted, portending an unfavorable outcome. In acute illness, righteous qi is still present; the faint pulse merely results from temporary suppression by pathogenic factors, and once the pathogens are expelled, qi and blood can recover—hence indicating survival. This embodies the core concept of "valuing righteous qi" in Chinese medicine—the state of righteous qi directly determines the outcome of disease.
Differentiating faint from thin pulse: The faint pulse is weaker, softer, and more "present yet absent" than the thin pulse. Although the thin pulse is fine, it "comes and goes like a thread and is consistently present," indicating that qi and blood, while not exuberant, can still be maintained; the faint pulse, which "on pressure seems about to cease," indicates that qi and blood are approaching exhaustion. The difference is one of degree, reflecting varying severity of deficiency.
From a modern medical perspective, the characteristics of the faint pulse—extremely weak pulse, present yet absent—relate to clinical states of low blood volume, low cardiac output, and poor peripheral circulation:
The ancients' observations were astute—the faint pulse indeed commonly appears in critical states of extreme qi and blood depletion. However, it must be objectively noted:
The faint pulse indicates fundamental depletion of qi and blood; from a wellness perspective, the key lies in "consolidating the root, nourishing the origin, and nipping problems in the bud":
Avoid prolonged excessive consumption: Whether physical overexertion or excessive mental deliberation, both insidiously deplete qi and blood. Maintaining a balance between work and rest is fundamental to preventing qi and blood decline.
Prioritize recovery during menstruation and postpartum: The original text specifically links women's uterine bleeding and vaginal discharge to the faint pulse, reminding us that during periods of significant blood loss—such as menstruation and the postpartum period—women should pay particular attention to rest and nutritional supplementation.
Chronic illness requires diligent recuperation: The original text notes that chronic illness with a faint pulse carries a poor prognosis, reminding us that chronic consumptive states should not be taken lightly; timely professional medical intervention should be sought, accompanied by reasonable daily recuperation.
Eat with moderation, live with regularity: The production of qi and blood depends on the spleen and stomach's transformation and transportation of food essence. Regular eating and adequate sleep are the foundations for maintaining full qi and blood.
The above consists of general wellness insights only and does not target any specific disease or constitute diagnostic or treatment advice.
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Further Reading:
This content is based on classic Chinese medical texts and is provided for traditional cultural study and research purposes only. It does not constitute any medical diagnosis, medication, or treatment recommendation. Please consult a qualified healthcare professional if you are unwell.