Left ear sevier pain, ringing, muffled hearing?

? infection: Could be an ear infection or swimmer's ear. You should be seen by a physician ( or call your PCP)

Several causes: Several causes can produce left earache, tinnitus, decreased hearing, such as: Otitis externa (swimmer's ear), acute labyrinthitis, otitis media ( middle ear infection), Ménière's disease (vertigo, tinnitus, hearing deficit), eustachian tube dysfunction, mastoiditis ( mastoid sinus infection/inflammation), and others. A physical exam is needed with your physician to identify the cause.