Here are a collection of information sheets, handouts and questionnaires about social anxiety disorder.  As I write in the "Diagnosis & background facts" sheet below - "About 7% of the population qualify for a full formal diagnosis of social anxiety disorder in any one year, but even those who suffer from what qualifies as only a partial syndrome can have their lives significantly affected.  Social anxiety disorder makes sufferers more vulnerable to subsequent depression and, when comorbid, the depression tends to be more severe and more resistant to treatment.  There may well also be comorbidity with other anxiety disorders.  Social anxiety disorder is frequently not diagnosed even though it is disabling and well worth treating."

Diagnosis & background facts - this handout gives the criteria for a DSM-IV diagnosis of social phobia/ social anxiety disorder.  It also gives the abstracts of four research studies illustrating how common and troublesome social anxiety can be.