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Chapter 18 of 28
濒湖脉学
Overall Paraphrase
The "Weak Pulse" (弱脉) discussed in Binhu Pulse Studies: Weak Pulse is classified as a Yin pulse in terms of pulse nature. The typical characteristics of the weak pulse are: extremely soft in quality, relatively deep in position, and thin in caliber. The physician must press heavily to the deep level to feel it; when the fingers are lifted lightly, it cannot be perceived — this is according to the Mai Jing (Pulse Classic).
In essence, the weak pulse can be viewed as a subtype of the soggy pulse (濡脉) that tends toward the deep position. However, the Mai Jue (Pulse诀) states that "it is perceived with light pressure," and Master Li compared the weak pulse to bubbles floating on the water surface — these are actually descriptions of the soggy pulse, not the weak pulse.
The Su Wen (Plain Questions) states: if the pulse is weak but flows smoothly and freely, it indicates that stomach qi (the vital vitality transformed by the spleen and stomach) is still present; if the pulse is weak and rough/unsmooth, it often indicates prolonged illness with consumption and depletion. The appearance of a weak pulse in those who are chronically ill, elderly, and constitutionally weak is a favorable pattern consistent with a state of deficiency and impairment; however, the appearance of a weak pulse in normally healthy individuals or young people is an abnormal unfavorable pattern.
The Form Poem states: the weak pulse comes and goes without strength, soft when pressed; the pulse shape is both thin and deep, invisible with light palpation. This is a sign of yang qi sinking into the yin aspect, with essence and blood depleted and weakened. Seeing this pulse in the elderly is somewhat understandable, but seeing it in the young is a cause for concern.
The Comparison Poem notes "see the soggy pulse," meaning that the differentiation between the weak pulse and the soggy pulse can be referenced in the section on the soggy pulse.
The Disease-Indication Poem states: the weak pulse primarily indicates yin deficiency and yang qi weakness, manifesting as aversion to cold, fever, weakness and atrophy of the sinews and bones, easy startling, excessive sweating, and diminished spirit. The ancients believed the treatment approach is to supplement righteous qi and harmonize nutritive blood, emphasizing early intervention. A weak pulse at the cun position mainly reflects yang deficiency; a weak pulse at the guan position mainly reflects stomach weakness and spleen debility; for further investigation into the locations of "yang sinking into yin" or "yin deficiency," combined assessment with the Shenmen (chi position) pulses on both hands and other pulse positions is needed.
The final paragraph summarizes: the weak pulse primarily corresponds to qi deficiency type pathologies. Zhang Zhongjing held that yang qi sinks into the yin aspect, hence aversion to cold and fever; he also stated that the weak pulse governs sinew disorders, the deep pulse governs bone disorders, and if yang floats externally while yin is weak internally, it can lead to blood deficiency and sinew constriction with tension. Master Liu held that qi deficiency results in a weak pulse; weakness at the cun position mainly indicates yang deficiency, weakness at the chi position mainly indicates yin deficiency, and weakness at the guan position mainly indicates stomach deficiency.
The "deep, thin, and lacking force" pulse described by the weak pulse may, from a modern medical perspective, be associated with reduced cardiac output, insufficient effective circulating blood volume, decreased vascular filling, low blood pressure, and weakened peripheral circulation. Similar pulse sensations may also appear in conditions of long-term malnutrition, after chronic consumptive diseases, and in constitutionally weak individuals. Traditional pulse diagnosis represents a holistic perception of the body's overall state rather than referring to a single pathological indicator.
It should be viewed objectively that traditional pulse diagnosis relies heavily on the physician's individual palpatory experience, is highly subjective, and has limited reproducibility. Although the weak pulse can indicate a direction of "deficiency and impairment," it cannot replace modern medical examination, nor should specific diseases be diagnosed based on pulse findings alone.
The weak pulse indicates that the body is in a low-energy, deficiency-oriented state. Daily care may focus on the following aspects:
These are general lifestyle suggestions only and do not target any specific disease.
⚠️ This content is based on classical Chinese medicine texts and is provided solely for traditional cultural study and research. It does not constitute any medical diagnosis, medication, or treatment advice. Please consult a healthcare professional if you are unwell. — Bù Guā