<unk><unk>  a<unk>  of<unk>  disorder (also called primary<unk>  is an anxiety disorder where the sufferer does not meet the DSM-5 criteria for<unk>  disorder.<unk>  typically develops as a result of having<unk>  disorder. In a small minority of cases, however,<unk>  can develop by itself<unk>  being triggered by the onset of<unk>  attacks.<unk>  can be caused by traumatic experiences, such as bullying or abuse.<unk> cally, there has been debate over whether<unk><unk><unk>  genuinely existed, or whether it was simply a manifestation of other disorders such as<unk>  disorder, general anxiety disorder, avoidant personality disorder and social phobia. One researcher said: "out of 41<unk> s seen (at a clinic) during a period of 1 year, only 1 fit the diagnosis of<unk><unk><unk>  attacks, and even this particular classification was questionable...Do not expect to see too many<unk> s<unk><unk> ". In spite of this earlier skepticism, current thinking is that<unk><unk><unk>  disorder is indeed a valid, unique illness which has gone largely unnoticed, since its sufferers are far less likely to seek clinical treatment.
Agoraphobia without history of panic disorder
Recurrent brief depression
Post-traumatic stress disorder and substance use disorders
Specific phobia
Treatment-resistant depression
Outline of bipolar disorder
Relationship obsessive–compulsive disorder
Clinical descriptions of chronic fatigue syndrome