Medicine A book taught by a specialist to read when it becomes difficult to speak

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Medicine "Voice" begins to age at the age of 30! In recent years, the number of people suffering from "voice disorders" has been increasing. There are various symptoms such as "difficulty speaking at the beginning of a speech," "difficulty even in simple words such as greetings," "difficulty speaking loudly or loudly," and "hoarseness or tiredness when speaking for a long time." However, due to low recognition, it is difficult to be understood by others, and it is often overlooked in hospitals or develops into mental illness. Therefore, in this book, a specialist who is trusted by professionals such as singers and announcers explains how to solve voice problems that are dangerous if left alone. Examples of voice problems include senile hoarseness, vocal cord paralysis, singer's nodule, spasmodic dysphonia, psychogenic dysphonia, and functional dysphonia.