Why are swimmers more likely to develop external otitis?

Swimmers are more susceptible to external otitis—often referred to as swimmer's ear—primarily because water can become trapped in the outer ear canal during swimming or diving.12

This trapped moisture creates a warm, damp environment that is highly conducive to the growth of bacteria, molds, or other microorganisms. When these pathogens infect the skin of the external auditory canal, it leads to inflammation characterized by itching, tenderness, swelling, and potential discharge. Because the condition thrives in humid conditions, individuals who engage in frequent water activities are at a significantly higher risk of developing this infection.312