A doctor can diagnose social anxiety disorder by thoroughly evaluating a person’s medical history. Observing the behaviors the patient reports or that family members have seen, and how the person functions in a social environment are also taken into account. The doctor may use various tools, such as questionnaires, interviews, or tests, to assess the severity and impact of the condition. It’s essential to rule out other possible causes or conditions. The doctor will usually use the criteria of DSM-5, which is the standard manual for classifying mental disorders.