(Ivanhoe Newswire) -- What doctors initially say is Alzheimer’s disease (AD), could actually turn out to be something else. New research shows that AD and other dementing illnesses may be easily misdiagnosed in the elderly. Over the last 30 years the number of people diagnosed with AD in the U.S. has skyrocketed. According to the CDC, AD affects an estimated five million Americans. But this study found that many of those patients could have been misdiagnosed.