Final answer:
A person with extreme anxiety causing significant disruptions in functioning is categorized as having an anxiety disorder.
Step-by-step explanation:
When a person's extreme anxiety is causing significant disruptions to his cognitive, behavioral, or interpersonal functioning, he is categorized as having an anxiety disorder. Anxiety disorders include a range of conditions such as obsessive-compulsive disorder (OCD), panic disorders, posttraumatic stress disorder (PTSD), and social and specific phobias. These conditions can have a profound impact on daily living and may require professional intervention to manage effectively.