notched

Many of us have just spent the Christmas season with a persistent and irritating ringing noise in our ears. But now that the relatives have gone home for the year, it's worth remembering that a large proportion of the population suffers from a more persistent ringing sensation - tinnitus. It happens in the absence of noise, it's one of the most common symptoms of hearing disorders, and it's loud enough to affect the quality of life of around 1-3% of the population.  There have been many suggested treatments but none of them have become firmly established and most simply try to help people…