Low-frequency hearing loss is different from high-frequency hearing loss. It makes people unable to easily detect that they have hearing loss. It makes people feel that the sound has lost its thickness, power, and weight. It is easy to miss the low alarm sound, and the male voice sounds unclear.

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Over-the-counter hearing aids have three important components: microphone, amplifier and speaker. Self-fitting hearing aids are equipped with signal channels. Generally, the more channels a hearing aid has, the wider the range it can adjust and the more expensive it is. Bluetooth hearing aids sometimes howl because an environment that can produce echoes is formed near the microphone.

Hearing loss can be classified into mild, moderate, moderately severe, and severe. Hearing loss of different frequencies will manifest differently in different environments. Patients with moderately severe hearing loss will have difficulty communicating in noisy environments.