Swimmer's ear is also known as?

something that hurts really bad in the ear from swimming too much.

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Hardly! It may be very painful but it's not caused by swimming "too much" whatever that means. Instead it's one or another infection by micro-organisms or an irritation by some chemical pollutant in the water. If it's from a swimming-pool I'd suspect breakdown products from the disinfectant attacking sweat, urine, sun-cream and other horrible things on swimmers' bodies.