Your hearing is a very complex organ.
There are many parts and sections to the hearing, in fact, the smallest bones in the human body are found in the middle portions of the ear. They are called the Malleus, Incus and Stapes, usually nicknamed hammer, anvil and stirrup.
As there are many parts to the ears, this relates to more problems that can arise with each part.
For example, the ear canals are susceptible to exostosis or narrowing of the canal usually referred to as swimmers' ears or surfers ears. This occurs as the body tries to protect its core temperature when swimming in freezing water. This process occurs over many years.
The middle portions of the hearing has many moving parts. Its best condition is to be air filled by using a tube from your sinus to this section of the ear using the Eustachian tube. So when you're suffering from a cold, the sinus gets congested and blocks the Eustachian tube from functioning properly. When you start to feel better from the cold, you may notice the Eustachian tube regain its function with a 'pop' in your ears and a sudden rush in sounds as if the world is clear again.
The final portion of the ear involves the hearing, the 'cochlear', which bears resemblance to a snail shell and balance organs (semi-circular canals). There are some diseases where a tear in the balance organ causes the patient to have overly sensitive and unnatural hearing abilities. However, the Cochlear area is where most of the damage occurs from excessive noise levels in our daily activities, work environments or even the typical age-related hearing loss.