separation anxiety disorder

**Definition (DSM-5-TR):** Excessive, developmentally inappropriate fear or anxiety about separation from home or attachment figures, with ≥3 of the following: (1) recurrent excessive distress when anticipating or experiencing separation; (2) persistent worry about losing, or harm befalling, attachment figures; (3) persistent worry about an untoward event (e.g., kidnapping) causing separation; (4) reluctance or refusal to go out (school, work) because of fear of separation; (5) fear of being alone at home or without attachment figures; (6) reluctance or refusal to sleep away from home or without being near an attachment figure; (7) repeated nightmares about separation; (8) repeated somatic complaints (headache, abdominal pain, nausea, vomiting) when separation occurs or is anticipated. Duration is ≥4 weeks in children/adolescents and typically ≥6 months in adults. It must cause clinically significant impairment and not be better explained by another disorder (e.g., autism spectrum disorder, agoraphobia, generalized anxiety disorder, psychosis).

**Epidemiology and course:** - It is the most common anxiety disorder in children under 12. Peak onset is around 7–9 years. It can persist into adulthood. - Normal separation anxiety appears at about 8–10 months, peaks around 18 months, and resolves by about 3–4 years. Separation anxiety disorder is anxiety that is excessive for the child's developmental level. - Risk factors: parental anxiety or overprotection, family history of anxiety or depression, behavioral inhibition temperament, and stressful life events (death of a loved one or pet, parental divorce, moving, change of school).

**Clinical presentation:** - Clinging to parents, tantrums, and crying when separated. - School refusal. Somatic complaints often occur on school days and resolve on weekends or holidays. - Nightmares and refusal to sleep alone. - Worry about catastrophic events such as accidents, illness, or death of parents. - Always rule out bullying, abuse, or learning disability as a cause of school avoidance.

**Pathophysiology:** The cause is multifactorial. Genetic heritability is moderate. Proposed mechanisms include amygdala hyperreactivity with decreased prefrontal regulation, and serotonergic and GABAergic dysregulation. Insecure attachment and learned or modeled parental anxiety also contribute.

**Associations and comorbidities:** Other anxiety disorders (generalized anxiety disorder, social anxiety disorder, specific phobia), panic disorder later in life, depression, and ADHD. Childhood separation anxiety is a risk factor for adult panic disorder and agoraphobia.

**Management:** - **First-line:** Cognitive behavioral therapy (CBT) with graded exposure and parent involvement or training. - **Pharmacotherapy:** SSRIs (e.g., sertraline, fluoxetine) for moderate-to-severe cases or when therapy alone fails. Monitor for the FDA boxed warning for suicidality in children, adolescents, and young adults. - **Avoid:** Benzodiazepines are not recommended as routine therapy in children. Prolonged school avoidance reinforces the anxiety, so early return to school is encouraged.

**Boards pearls:** - A child who has abdominal pain on school days, clings to a parent, and fears harm to the parent has separation anxiety disorder. Treat with CBT ± SSRI. - Do not confuse it with normal developmental separation anxiety (infants and toddlers). - It differs from selective mutism, which is a failure to speak in specific social settings. It also differs from social anxiety disorder, which involves fear of negative evaluation by peers or adults. - It differs from reactive attachment disorder, which involves absent or minimal attachment after severe neglect. - The first-line medication class for pediatric anxiety disorders is SSRIs.