Ryan suffers from nearly constant, low-level arousal of his autonomic nervous system. Ryan is most likely to be classified as suffering from

Ryan suffers from nearly constant, low-level arousal of his autonomic nervous system. Ryan is most likely to be classified as suffering from Correct Answer GAD.

Ryan is most likely to be classified as suffering from GAD, generalized anxiety disorder. As described in the question, GAD involves a nearly constant low-level arousal of the autonomic nervous system. Major depressive disorder is a mood disorder rather than an anxiety disorder. Hypochondriasis is a type of somatoform disorder in which sufferers fear that typical body sensations are indicative of medical problems. People who have obsessive-compulsive personality disorder tend to be inflexible and overly concerned with things like neatness, routine, and perfection. PTSD (posttraumatic stress disorder) follows some kind of trauma and is usually marked by anxiety caused by memories, flashbacks, and nightmares having to do with the trauma.