While obsessive-compulsive disorder is not officially classified by the American Psychological Association as an anxiety disorder, it shares many traits with common anxiety disorders, such as generalized anxiety disorder. In both conditions, you may know that your thoughts are irrational, but you feel unable to stop thinking them. Often, but not always, these thoughts may concern cleanliness, sex, or religion.
Panic attacks can occur unexpectedly during a calm state or in an anxious state. Although panic attacks are a defining characteristic of panic disorder, it is not uncommon for individuals to experience panic attacks in the context of other psychological disorders. For example, someone with social anxiety disorder might have a panic attack before giving a talk at a conference and someone with obsessive-compulsive disorder might have a panic attack when prevented from engaging in a ritual or compulsion.
Obsessive-compulsive Disorder (OCD): In OCD, a person becomes trapped in a pattern of repetitive thoughts and behaviors that are senseless and distressing but extremely difficult to overcome. Such rituals as counting, prolonged handwashing, and repeatedly checking for danger may occupy much of the person’s time and interfere with other activities. Like panic disorder, OCD can be treated effectively with medication and/or psychotherapy.
Anxiety attacks usually peak within 10 minutes, and they rarely last more than 30 minutes. But during that short time, the terror can be so severe that you feel as if you’re about to die or totally lose control. The physical symptoms of anxiety attacks are themselves so frightening that many people believe they’re having a heart attack. After an anxiety attack is over, you may be worried about having another one, particularly in a public place where help isn’t available or you can’t easily escape.
The emotional effects of anxiety may include "feelings of apprehension or dread, trouble concentrating, feeling tense or jumpy, anticipating the worst, irritability, restlessness, watching (and waiting) for signs (and occurrences) of danger, and, feeling like your mind's gone blank" as well as "nightmares/bad dreams, obsessions about sensations, déjà vu, a trapped-in-your-mind feeling, and feeling like everything is scary."
Selective mutism: A somewhat rare disorder associated with anxiety is selective mutism. Selective mutism occurs when people fail to speak in specific social situations despite having normal language skills. Selective mutism usually occurs before the age of 5 and is often associated with extreme shyness, fear of social embarrassment, compulsive traits, withdrawal, clinging behavior, and temper tantrums. People diagnosed with selective mutism are often also diagnosed with other anxiety disorders.