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舌色青晦，如水牛之舌，苔白润滑，或带灰滑之象。
Tongue a dark blue-green, resembling the tongue of a water buffalo, with a moist-slippery white coating that may appear grayish.
主寒凝经脉或重证血瘀；阳气不达，血行凝涩，病多危重。
Indicates cold congealing the channels or severe blood stasis; yang fails to reach the periphery and blood flow stagnates—usually a serious or critical condition.
@misc{bencaodian-blue-green,
author = {{Bencaodian Editorial}},
title = {qīng shé 青舌 (Blue-Green Tongue)},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/zh/tongue/blue-green},
urldate = {2026-04-09},
note = {CC BY-SA 4.0}
}