A growing number of Canadians, especially older ones, are suffering from vertigo, a sometimes debilitating chronic dizziness that can result from viruses, sports injuries and certain medications, and is almost impossible to cure.

A popular, low-cost antibiotic developed in the 1960s, gentamicin has proved remarkably effective against a particular group of bacteria. But if not administered with caution it can also destroy the inner ear, the body's balance mechanism.

For those with chronic vertigo, there is hope. Studies show that rehabilitation exercises can often help the brain develop alternative pathways for motion sensing. But it's hard work, and the gains may not last with aging.