Responses to stress that are directed toward the self, such as anxiety, depression, fearfulness, self-destructive behaviors, withdrawal, and worrying. They are particularly a problem among teenagers. In the US, the lifetime prevalence of anxiety problems is about 32% and mood disorders some 14% in the US.
See Anhedonia, Dysphoria, Externalizing disorders/problems, Major depressive disorder, Prevalence, Self, Social Skills Improvement System (SSIS)