Social anxiety disorder is sometimes called social phobia. Social anxiety disorder is not just shyness; it is more severe than this.

NHS Choices – social anxiety symptoms and treatment. 

Patient.info – social anxiety disorder is sometimes called social phobia. Social anxiety disorder is not just shyness; it is more severe than this. With social anxiety disorder you become very anxious about what other people may think of you, or how they may judge you. As a result you have great difficulty in social situations, which can affect your day-to-day life. For more information visit the website. 

Royal College of Psychiatrists – this leaflet is for anyone who finds shyness a problem, or who suffers from a social phobia. It may also be helpful for friends or family who want to be able to understand and help.