Tinnitus is a ringing or buzzing noise (or any abnormal sound) in one or both ears, that is not generated by external sound but by the ear/brain itself. It can be constant or intermittent and differ in loudness between patients. Tinnitus is often associated with a hearing loss, but can also be seen in patients with normal hearing. Although tinnitus is usually harmless, albeit annoying, it can also be a symptom of a more serious problem, such a tumour or neurological issue. Best is to have a hearing evaluation done should you experience tinnitus.