He is suffering from Tinnitus.
Tinnitus is ringing or buzzing noise in one or both ears that may be constant or come and go, often associated with hearing loss.
COMMON CAUSES
Ringing in ears can have causes that aren't due to underlying disease. Examples include exposure to loud sounds, head injuries, too much ear wax or medication side effects.
Next Steps
Pure Tone Audiometry
Tympanometry
Health Tips
SELF-TREATMENT
Distracting sounds such as a fan, low-volume radio static or soft music may make tinnitus more tolerable. Relaxation, biofeedback and exercise may also help.