Which of the following conditions can affect hearing aid fitting?

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A collapsing ear canal can significantly impact the fitting of hearing aids because it alters the natural shape and size of the ear canal, which is crucial for proper sound delivery and comfort. When the ear canal collapses, it can lead to poor sound quality, improper placement of the hearing aid, and discomfort for the user. This condition may necessitate specific adaptations in the design or fitting of hearing aids to ensure an optimal listening experience.

In contrast, while congenital disorders and various types of hearing loss can influence how a hearing aid works, not all congenital issues or types of hearing loss directly affect the physical fitting of the device in the ear canal—some might instead relate more to sound processing or sound amplification needs. Severe infections can indeed complicate or temporarily affect hearing aid usage, but they do not have the direct physical impact on the fitting process that a collapsing ear canal does. Thus, focusing on the physical aspect of how the ear canal structure affects the fitting leads to the conclusion that a collapsing ear canal is the most direct condition impacting hearing aid fitting among the options presented.

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