Which disorder results in excessive hoarseness and sudden changes in volume or pitch?

Phonation disorders are characterized by impairments in the production of sound due to issues with the vocal cords or larynx. These disorders can manifest as hoarseness, and individuals may experience sudden changes in pitch or volume. Such changes occur because phonation involves the vibration of the vocal folds; when these folds are disrupted—due to inflammation, nodules, or other vocal cord issues—it can lead to an irregular sound quality, which is perceived as hoarseness. Furthermore, phonation disorders can cause unpredictable shifts in how one's voice sounds, aligning closely with the symptoms described—excessive hoarseness and sudden fluctuations in volume or pitch. This makes phonation disorders the most fitting choice among the available options.