What is the primary psychiatric disorder for a 15-year-old high school student who avoids speaking in class and participating in group activities due to fear of judgment and embarrassment?

Social Anxiety Disorder (Social Phobia)

The primary psychiatric problem for this 15-year-old is Social Anxiety Disorder (SAD), characterized by excessive fear of negative evaluation by others in social situations, leading to avoidance of speaking in class and group participation.

Clinical Reasoning

This presentation is textbook for social anxiety disorder. The key diagnostic features present are:

• Fear of judgment and embarrassment in social/performance situations (speaking in class, group activities)
• Avoidance behavior as the primary coping mechanism
• Age-appropriate onset - social anxiety typically emerges in later school-age and early adolescent years, with the guideline noting this is the expected developmental window for SAD onset 1

According to DSM-5 criteria outlined in the AACAP guidelines, social anxiety is characterized by excessive fear or worry about being negatively evaluated by others in social situations 1. This directly matches the clinical presentation described.

Epidemiology Supporting This Diagnosis

The prevalence data strongly supports this diagnosis:

• Among youths aged 13-18 years, lifetime prevalence of social anxiety approximates 9%, making it the second most common specific anxiety disorder after specific phobia 1
• Social anxiety is a major cause of school refusal in adolescents 2
• The disorder often leads to avoidance, low self-esteem, and social isolation 3

Developmental Context

The timing is critical here. The guideline explicitly states that social anxiety typically onsets in the later school-age and early adolescent years 1, which perfectly aligns with this 15-year-old patient. This is distinct from:

• Separation anxiety (preschool/early school-age)
• Specific phobias (school-age years)
• Generalized anxiety/panic (later adolescent/young adult years)

Distinguishing Features from Other Anxiety Disorders

This is not generalized anxiety disorder because:

• The fears are specifically social/performance-related, not "excessive, uncontrollable worries regarding numerous everyday situations" 1
• The avoidance is targeted to social evaluation contexts

This is not selective mutism because:

• Selective mutism involves complete absence of speech in specific social situations despite speaking at home 1
• This patient avoids speaking but the presentation suggests capability to speak, just with fear-driven avoidance

Clinical Significance and Impact

Research demonstrates that adolescents with social anxiety:

• Fear and avoid significantly more social situations than other anxious youth 4
• Have trouble making friends and prefer being alone rather than with peers 4
• Experience underestimation of their likeability by peers when they primarily worry about negative evaluation 5
• Show impaired classroom functioning, including poorer social skills and leadership abilities 4

Common Pitfalls to Avoid

1. Don't dismiss this as "normal adolescent shyness" - the avoidance of class participation and group activities indicates functional impairment meeting disorder criteria
2. Screen for comorbidity - all children with social anxiety in one study met criteria for at least one comorbid disorder 4, particularly depression, other anxiety disorders, and ADHD 1
3. Assess both fear AND avoidance - research shows these are distinct contributions to SAD presentation, and avoidance tendencies are associated with actually being less liked by peers and having fewer friends 5, 6

Next Steps in Assessment

Confirm the diagnosis by establishing:

• Duration and persistence of symptoms
• Clinically significant distress and/or functional impairment (already suggested by class avoidance)
• Number of social situations feared and avoided
• Rule out substance use or medical conditions causing anxiety 1

The Level 1 Cross-Cutting Symptom Measures from the APA can systematically screen for anxiety and comorbid conditions 1.