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Shrillness is a factor upon which a frequency is determined. It is a type of frequency along with pitch.
Hoarseness is a general term that can encompass a wide range of sounds, such as a raspy or breathy voice. While hoarseness often is caused by a cold or extended periods of talking or yelling, it also can be a symptom of a more serious condition such as a growth on the vocal cords, including polyps or cysts. Many of these growths often can be treated through voice therapy, although surgery may be required.