Final answer:
An ear canal occluded with wax can cause feedback during hearing aid usage, affect hearing test results, and should be corrected by a physician.
Step-by-step explanation:
An ear canal occluded with wax can cause various issues related to hearing. One common effect is feedback during hearing aid usage. When the ear canal is blocked by wax, the sound from the hearing aid can bounce back into the microphone, causing a feedback loop and distorted sound. Additionally, having wax in the ear canal can impact the accuracy of hearing tests. The presence of wax can affect the sound transmission and lead to different test results compared to when the wax is removed. Lastly, it is recommended to consult a physician for correction if the ear canal is occluded with wax to ensure proper and safe removal.