The odor in the ear is considered to be caused by purulent otitis media, eczema in the ear and otitis externa. 1. Purulent otitis media: purulent otitis media caused by bacterial infection will accumulate pus in the ear, especially the pus caused by anaerobic bacteria and Pseudomonas aeruginosa infection will have obvious odor. 3. Eczema in the ear: when eczema occurs in the ear, the secretion will increase, and if the treatment is not timely, the secretion will produce an odor. 4. Otitis externa: when bacterial infection occurs in the external auditory canal, there will be congestion, edema, increased secretion in the ear canal, due to secretion, the ear canal will be moist, if not treated in time, it is easy to cause odor in the ear. If the odor appears in the ear, you need to go to the hospital in time to check the specific cause and treatment, so as not to delay the condition.