In many cases hearing aids can significantly improve the hearing of a person with a hearing loss. Depending on the type and degree of loss experienced, hearing aids can approximate normal hearing for some people – usually those with a mild loss. However, hearing loss may range from mild to severe or profound, and can be caused by different factors. It may be due to the natural aging process, genetic factors, trauma to the ear, and a variety of medical conditions including chronic middle ear congestion due to colds or influenza.