Ringing that seems to originate in the ear or head, is known as tinnitus.
Usually, it is a symptom of an underlying condition.
The cause can range from something harmless like excessive wax accumulation in the ear canal, to a more serious condition like brain vessel widening, aneurysm or brain tumor, known as acustic tumor.
Other possible causes are fluid, infection, or disease of the middle ear bones or ear drum, side effect of loud noise exposure, side effect of certain medications, or symptom of inner ear disease, symptom of certain types of headache, TMJ symptom and more.

See your physician for true evaluation!
Marija