Foul-smelling ears may be associated with cholesteatoma of the external auditory canal, cerumen impaction or foreign bodies in the external auditory canal and infection, otitis media, etc. 1. Cholesteatoma of the external auditory canal: also known as obstructive keratosis of the external auditory canal, it is caused by cholesterol crystal-containing epithelial clumps obstructing the bones of the external auditory canal, and is usually seen unilaterally. If secondary infection occurs, it can cause headache, earache and foul-smelling discharge from the external auditory canal. 2. Cerumen embolism of the external auditory canal or foreign body of the external auditory canal combined with infection: when the cerumen secretion is too much or the discharge is blocked, it can become a mass, as well as the foreign body in the external auditory canal, if water enters into the ear to soak up the cerumen or the foreign body, and there are infections such as anaerobic bacteria and bacterial infections, it will cause smelly ear and earache and other manifestations. 3. otitis media: such as chronic purulent otitis media, tinnitus, hearing loss, recurrent pus and other manifestations, there will also be a smelly ear. Smelly ears should pay attention to local cleaning, frequent attacks or long-lasting patients need to consult a doctor in time, the cause, symptomatic standardized treatment.