Sensations in my ears

I have been having some ringing sensations in my left ear for some time. Kindly let me know what to do about this.

Anote (by SMS)

The ringing sensation can be caused by blocked ear canals with a build- up of fluid (ear infection), earwax, dirt or other foreign materials. A blockage can change the pressure in the ear, causing tinnitus. Head or neck injuries. Head or neck trauma can affect the inner ear, hearing nerves or brain function linked to hearing. A complete examination by a medical doctor can clear up the issue.