And therein lies a problem. According to physicians Edward Shorter of Canada and Peter Tyrer of England, the prevailing view of anxiety and depression as two distinct disorders, with multiple flavors of anxiety, is a "wrong classification" that has led the pharmaceutical industry down a "blind alley." It's bad enough that the separation of anxiety and depression lacks clinical relevance. But it's also "one reason for the big slowdown in drug discovery in psychiatric drugs," the two contend in a recent article published in the British Medical Journal. It's difficult to create effective drugs for marketing-driven disease "niches."
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Who is at risk for combined anxiety and depression? There's definitely a family component. "Looking at [what disorders populate] the family history of a person who presents with either primary anxiety or depression provides a clue to whether he or she will end up with both," says Joseph Himle, Ph.D., associate director of the anxiety disorders unit at University of Michigan.
The nature of the anxiety disorder also has an influence. Obsessive-compulsive disorder, panic disorder and social phobia are particularly associated with depression. Specific phobias are less so.
Age plays a role, too. A person who develops an anxiety disorder for the first time after age 40 is likely also to have depression, observes Himle. "Someone who develops panic attacks for the first time at age 50 often has a history of depression or is experiencing depression at the same time."
Usually, anxiety precedes depression, typically by several years. Currently, the average age of onset of any anxiety disorder is late childhood/early adolescence. Psychologist Michael Yapko, Ph.D., contends that presents a huge opportunity for the prevention of depression, as the average age of first onset is now mid-20s. "A young person is not likely to outgrow anxiety unless treated and taught cognitive skills," he says. "But aggressive treatment of the anxiety when it appears can prevent the subsequent development of depression."