Ringing sensations in my ears

I am a 55-year-old female teacher. I started having a ringing sensation in my ears over a month ago. Kindly let me know what is causing the problem and what I can do about it.
Suzan (by SMS)

Tinnitus (pronounced ti-ni-tis), or ringing in the ears, is the sensation of hearing ringing, buzzing, hissing, chirping, whistling, or other sounds. The noise can be intermittent or continuous and can vary in loudness. It is often worse when background noise is low, so you may be most aware of it at night when you’re trying to fall asleep in a quiet room. Tinnitus is very common, affecting many people the world over. Although tinnitus is often associated with hearing loss, it does not cause the loss, nor does a hearing loss cause tinnitus. In fact, some people with tinnitus experience no difficulty in hearing. Some instances of tinnitus are caused by infections or blockages in the ear, and the tinnitus can disappear once the underlying cause is treated. Frequently, however, tinnitus continues after the underlying condition is treated. In such a case, a specialist attention may be required.