The human ear is composed of the inner ear, middle ear, and the outer ear. Ear infection can attack any of these parts and one part can usually infect the others. External otitis affects the outer ear some times it comes after cold or flu or some other kind of upper respiratory infection. The area from the eardrum to the outer part, becomes inflamed and is very painful, sometimes a fever may be developed. Otitis media affects the area inside the eardrum and all the small bones, the air pressure is regulated in this area by the auditory tube running from the ear to the back of the nasal cavity, when bacteria or a virus gets in this area, the different parts become inflamed with fluid, causing pressure and extremely sharp pain in the ear with fever. If the infection is not controlled it can result in eardrum perforation letting all pressure out and relieving pain, but a perforated eardrum means loss of hearing and fluid discharge. This kind of ear infection is very common in infants due to the position of the baby while feeding allowing milk bacteria to grow in the auditory tube.