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"Everyone has a degree of negative emotionality," said Duncan B. Clark, a psychiatrist, psychologist, director of the Pittsburgh Adolescent Alcohol Research Center, and lead author of the study. "This is not a disorder or a categorical trait; it is the degree to which an individual reports certain emotional characteristics."
However, I would not go so far as to say these health problems were 'all in their head.' Anxiety and depression have been shown to cause demonstrable physical changes."