Dsm-iv poses 6 categories of anxiety: phobias, panic disorder, generalized anxiety disorder, obsessive-compulsive disorder, ptsd and acute stress disorder. Comorbidity is when you have more than 1 disorder at any given time and can arise from: symptoms of anxiety are not disorder specific. Signs of anxiety such as perspiration, heart rate etc. can be diagnosed for panic disorder, phobia"s, ptsd etc. etiological factors that give rise to anxiety disorders may be applicable to more than 1 disordor. Anxiety disorders are more prevalent in woman and the likelihood decreases with age. It is an irrational fear-mediated avoidance of an object that is out of proportion to the danger it poses, and is recognized by the sufferer as groundless. Each term ends with phobia derived from phobos, a greek god that would scare enemies. Behaviourists see acquisition of fear and reduction of fear, they ignore the content of the phobia. Specific phobias unwarranted fears caused by presence or anticipiation of an object.