A greater understanding of the origins of social phobia is much needed. The research to date is limited by the relatively small number of studies that sample clinical populations of individuals with social phobia. There is, however, research derived from related areas such as shyness, social anxiety, self-consciousness, peer neglect, and social withdrawal that contributes to a richer understanding of the etiology of social fears. Combining these areas of research, this review addresses four main factors that may be important to the origins of social phobia: (a) genetic factors; (b) family factors; (c) other environmental factors; and (d) developmental factors.