The  National Institute of Health (NIH) found that hearing loss is 2 times more common in diabetics as those without diabetes. Even pre-diabetics have 30% more hearing loss than those with normal blood sugar. Why is this? Hearing depends on small blood vessels and nerves in the inner ear. Researchers believe that high blood glucose levels can damage vessels and nerves, causing hearing loss. The good news is that most hearing loss can be treated with hearing aids. And remember, the sooner the loss is treated, the more hearing that can be retained.Reference: American Diabetes Association