The main symptom of the anxiety disorders is, as the name implies, a feeling of intense anxiety, and in many cases people with an anxiety disorder will take steps (often disrup-tive to their lives, and usually unsuccessful) to deal with the anxiety. Anxiety disorders are the most common mental disorders; we mentioned earlier that the lifetime preva-lence for these disorders is 29% (Kessler et al., 2005). These disorders are found in both sexes, although more commonly in women than in men (Breslau, Chilcoat, Kessler, & Davis, 1999; Graaf, Bijl, Smit, Vollebergh, & Spijker, 2002). There are many types of anxiety disorders, and in the following sections, we discuss each of the major types in turn before considering the roots of these disorders.
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