Anxiety is one of the most common psychiatric disorders affecting people with autism. About 40 percent of youth – and up to half of adults – meet the clinical criteria of an anxiety disorder, such as social anxiety, phobia, panic disorder, or generalized anxiety, or obsessive-compulsive disorder.3-9 By comparison, the anxiety rates in adults and children who do not have autism is 18 and 25 percent, respectively, according to the U.S. National Institute of Mental Health.