Anxiety is a symptom that occurs in many different diagnoses. There are five common anxiety disorders of adulthood and one other of childhood.
The common anxiety disorders of adulthood are Generalized Anxiety, Obsessive-Compulsive Disorder, Panic Disorder, Post Traumatic Stress Disorder, and Social Phobia. The anxiety disorder of childhood onset is Separation Anxiety.
There are effective medical and psychological treatments of all the anxiety disorders. The medical and psychological treatments are often most powerful when they are combined.