Ear pain after swimming may be related to the contamination of the ear canal by swimming water, which may induce otitis externa, tympanitis, otitis media, etc. It is also related to the swelling of cerumen in the ear canal caused by swimming water, which may induce cerumen infection. The clinical treatment for the above mentioned diseases are as follows: a. If otitis externa, tympanitis or otitis media is induced, you can use antibiotic ear drops, common ones are levofloxacin ear drops for ear bath treatment and systemic oral or intravenous application of antibiotics for anti-inflammatory and anti-swelling treatment, generally patients should have significant relief of symptoms after a week or so. If the cerumen is dilute, you can suck it out with a suction device and use levofloxacin ear drops for ear bath, anti-inflammatory and anti-swelling treatment. If the cerumen is still hard, it can be softened with levofloxacin ear drops and then sucked out with saline or suction after a day or two, which can also achieve the purpose of treatment.