How can intense sound blasts damage the eardrum and middle ear?

Intense sound blasts, such as those from explosions or gunfire, can cause significant physical damage to the ear because the protective reflexes of the middle-ear muscles are not instantaneous and cannot react quickly enough to mitigate the impact of sudden, high-intensity pressure waves.1

When these powerful pressure waves strike the ear, they can lead to the following injuries:

• Tympanic Membrane Rupture: The tympanic membrane (eardrum) is a fragile structure that can be torn or ruptured by the force of a blast. This is often accompanied by pain, hearing difficulty, and sometimes bleeding. While a ruptured membrane can often heal over time, it is a serious injury.23
• Middle Ear Damage: The blast can cause the small bones (ossicles) of the middle ear to become dislocated or fractured. Because these bones are essential for transmitting sound vibrations to the inner ear, such damage can result in significant hearing loss.24

While middle-ear damage is sometimes correctable through surgery—such as repairing or replacing the damaged bones—the intensity of such blasts poses a severe risk to the entire auditory system.24