Acoustic trauma can be caused by a sudden and powerful sound like an explosion. Explosions often lead to damaged ear drums and consequently conductive hearing loss.
Many people have experienced a period of reduced hearing after exposure to loud sounds, for example after a concert or a visit to a discotheque or after having worked with noisy equipment. This kind of hearing impairment is often temporary. After some time the trauma will stop.
If Acoustic trauma continues, it will typically lead to hearing impairment within a relatively narrow frequency around 4 kHz. In other words, the person will be unable to hear within a certain range of high frequency tones.
In certain daily situations, this may not bother people. But in more noisy environments, they may have problems hearing. Sometimes a hearing aid can be of help to people suffering from permanent Acoustic trauma.