Ear infections can be divided into three main types: otitis externa, otitis media, and otitis interna. Otitis externa, or swimmer's ear, is an infection of the outer ear and ear canal. It is usually caused by bacterial or fungal overgrowth and is usually accompanied by redness, itching, and drainage. Otitis media is an infection of the middle ear, and is often caused by a virus or bacteria. Symptoms include ear pain, fever, and hearing loss. Lastly, otitis interna is an infection of the inner ear and is usually caused by a virus or bacteria. Symptoms may include dizziness, nausea, ringing in the ears, and hearing loss. Treatment for all three types of ear infection is similar and may involve antibiotics, anti-inflammatory medications, or surgery depending on the severity.