灵枢经·忧恚无言 On Grief and Rage Causing Loss of Voice
黄帝问于少师曰：人之卒然忧恚，而言无音者，何道之塞？何气出行？使音不彰？愿闻其方。少师答曰：咽喉者，水谷之道也。喉咙者，气之所以上下者也。会厌者，声音之户也。口唇者，声音之扇也。舌者，声音之机也。悬壅垂者，声音之关者。颃颡者，分气之所泄也。横骨者，神气所使主发舌者也。故人之鼻洞涕出不收者，颃颡不开，分气失也。是故厌小而疾薄，则发气疾，其开阖利，其出气易，其厌大而厚，则开阖难，其气出迟，故重言也。人卒然无音者，寒气客于厌，则厌不能发，发不能下，至其开阖不致，故无音。
黄帝曰：刺之奈何？歧伯曰：足之少阴，上系于舌，络于横骨，终于会厌。两写其血脉，浊气乃避。会厌之脉，上络任脉，取之天突，其厌乃发也。
Huangdi asked Shaoshi: 'When a person is suddenly overcome by grief and rage and thereafter speaks without sound, what pathway has become obstructed, and what qi is escaping outward, so that the voice fails to be expressed? I should like to hear the explanation.' Shaoshi replied: 'The throat is the pathway of water and grain. The windpipe is that by which qi ascends and descends. The epiglottis is the door of the voice. The lips are the shutters of the voice. The tongue is the trigger of the voice. The uvula is the pass that gates the voice. The nasopharynx is where the divided qi is vented. The hyoid bone is what the spirit qi employs to govern the movement of the tongue. Thus, when a person's nose runs with clear discharge that cannot be checked, it is because the nasopharynx has failed to open and the divided qi has lost its outlet. Therefore, when the epiglottis is small and moves quickly and thinly, the qi is issued swiftly, its opening and closing are smooth, and its qi passes out with ease; but when the epiglottis is large and thick, its opening and closing are difficult, its qi is expelled slowly, and so the person's speech becomes heavy and halting. When a person suddenly loses the voice altogether, it is because cold qi has lodged in the epiglottis, so that the epiglottis can no longer rise, and having risen cannot come back down; its opening and closing fail to be accomplished, and hence there is no voice.'
Huangdi said: 'How does one needle this?' Qibo said: 'The Foot Shaoyin Kidney channel ascends to bind with the tongue, connects with the hyoid bone, and terminates at the epiglottis. Drain its blood vessels on both sides, and the turbid qi will thereby be dispelled. The vessel of the epiglottis ascends to connect with the Conception Vessel; select the point Tiantu (Celestial Chimney), and the epiglottis will then be restored to function.'