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细来累累细如丝，应指沉沉无绝期。
—— 濒湖脉学 · 细脉 · 体状诗
Thin and strung like a silk thread, it sinks firmly beneath the finger yet never breaks off.
脉细如线，但应指明显，按之不绝。脉道狭小而力较弱。
As slender as a thread yet clearly felt beneath the finger, unbroken on pressure. The vessel path is narrow and the force somewhat diminished.
主气血两虚、诸虚劳损，亦主湿邪为病。阴血不足，不能充盈脉道，故脉细。
Indicates dual deficiency of qi and blood and various patterns of consumption; it also appears when dampness has taken hold. With insufficient yin-blood to fill the vessels, the pulse becomes thin.
@misc{bencaodian-xi-mai,
author = {{Bencaodian Editorial}},
title = {Xì mài 细脉 (Thready)},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/pulses/xi-mai},
urldate = {2026-04-09},
note = {CC BY-SA 4.0}
}