In one of her stand-up comedy routines, Ellen Degeneres riffs on those commercials for depression medications that begin: "Do you ever feel sad?" Ms. Degeneres's sardonic response: "Yes, I'm alive!" Everyone occasionally feels down, so mild depression might indeed be considered part and parcel of living. Recent research suggests that, like pain, it may be a way of coping with a bad situation by making a change. One problem with most psychological diagnostic tools, in fact, is that they attempt to squeeze into a well-defined box behaviors that are, on some level, not all that unusual. So the criteria lists grow and the diagnostic labels broaden into what psychologists call "spectrums."
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