Patients with otitis media should not swim, whether it is acute or chronic otitis media. This is because water can enter the ear during swimming. Once dirty water enters the ear, especially in cases of chronic otitis media, it can lead to an acute episode of chronic otitis media. Many patients with chronic otitis media have a perforated eardrum. Without the protection of the eardrum, dirty water can directly enter the middle ear, causing an acute episode of otitis media. This can result in suppuration, ear discharge, and further deep infections, such as infections reaching the deep bone tissue of the mastoid, which requires a long time to treat and might even necessitate surgical intervention. If it is the acute phase of otitis media, the entry of water can irritate the eardrum or cause the pus in the middle ear to worsen, further hindering recovery and exacerbating the condition.