Recently, we received a question about whether pollutants or radon could cause ‘forgetfulness.' As a result I want to throw some light on this very complex area. We often think of symptoms that include changes in memory, memory loss and, in some cases, confusion, as some type of dementia. However there are also many other diseases and conditions where these symptoms may be present.

As yet we do not know why people get Alzheimer's and indeed whether Alzheimer's has one cause or, more...