Buzzing in one ear may have the following diseases: 1. neurogenic tinnitus, caused by insufficient blood supply to the inner ear and poor microcirculation, may be accompanied by hearing loss, a sense of ear congestion, vertigo and other clinical manifestations. 2. tinnitus associated with secretory otitis media, acute otitis media, etc., with clinical manifestations such as ear pain, ear discharge and a sense of ear congestion. 3. foreign bodies in the ear canal, such as cerumen in the ear canal that irritates the eardrum, may cause 4. abnormal opening of the eustachian tube, which may cause tinnitus at the same frequency as breathing. 5. objective tinnitus caused by vascular malformation. 6. auditory neuroma, cerebral blood supply deficiency, etc., which may also cause tinnitus.