Swimmer's ear is a painful condition that causes inflammation, irritation, or infection of the outer ear. Symptoms include itching, pain, or a feeling of fullness in the ear. If left untreated, it can cause hearing loss, but normal hearing returns after treatment. Treatment typically involves cleaning the ear canal and using ear drops to prevent bacterial or fungal growth. Prevention methods include drying ears well after swimming, using ear plugs, and periodically cleaning ears if itchy or with excess wax.