A middle ear infection (otitis media) occurs behind the eardrum in the air-filled space where tiny vibrating bones help transmit sound. This type of infection is often associated with fluid buildup, pressure, and pain. A middle ear infection typically develops due to a cold or respiratory infection that causes eustachian tube inflammation or blockage. This leads to fluid buildup that could potentially become infected.
Even if the underlying cause is a virus or bacteria and contagious, the ear infection itself is not.
An external ear infection (otitis externa), sometimes known as swimmer’s ear, affects the outer ear canal. It usually occurs when water, bacteria, or fungi get trapped in the ear canal, causing inflammation, redness, itching, and sometimes discharge. External ear infections are often linked to moisture or injury to the ear canal's skin.