CHAPTER 38 Aphonia During Pregnancy
Aetiology and pathology
Chapter 47 of the Simple Questions says:
The Yellow Emperor asked: In the ninth month of pregnancy some women develop aphonia, how does this happen? Chi Po replied: It is because the Uterus Channel becomes cut off. The Yellow Emperor asked: How do you explain that? Chi Po replied: The Uterus channel is connected to the Kidneys which pertains to Lesser Yin; the Kidney channel reaches the root of the tongue, hence the woman cannot speak.1