Separation anxiety disorder is developmentally inappropriate, excessive fear or anxiety about separation from attachment figures. DSM-5 criteria require at least three symptoms (recurrent distress when anticipating or experiencing separation, persistent worry about harm to attachment figures, reluctance to be alone, refusal to sleep without attachment figure, repeated nightmares of separation, somatic symptoms when separation occurs or is anticipated) lasting at least 4 weeks in children or 6 months in adults.
Historically classified as a childhood disorder, DSM-5 recognized that the same disorder occurs in adults. The phenotype differs by age but the underlying pattern — attachment-related anxiety driving avoidance and impairment — is consistent. Adult separation anxiety is now recognized as common (1-2% of adults) and frequently missed.
In children: the 7-year-old who cannot stay at sleepovers, cannot attend camp, cannot tolerate the parent leaving for work, develops somatic complaints (stomachaches, headaches) when separation is anticipated. School refusal is a common presentation.
In adults: the patient who experiences panic when partner travels, has persistent worry about partner safety, cannot be alone at home, experiences somatic symptoms during separations, has difficulty with milestone transitions (children leaving home, partner career changes). Often misdiagnosed as GAD, panic disorder, or relationship anxiety. Recognizing the underlying attachment-related core reframes treatment.
The neurobiology: amygdala reactivity to separation cues, dysregulated oxytocin signaling, often elevated in patients with early disrupted attachment. The disorder has roots in attachment biology that link to broader research on relational and dependency patterns.
Treatment: CBT with gradual separation exposure is first-line. The patient learns to tolerate separation distress through structured practice, develops coping skills, and rebuilds tolerance. For children: family-based interventions with parent coaching critical. For adults: individual CBT, often with attachment-focused elements, sometimes couples therapy.
Pharmacotherapy: SSRIs for moderate-severe cases not adequately responding to therapy alone. Same agents and dosing as for other anxiety disorders. Combination treatment for severe cases.
When you encounter chronic anxiety with relational or attachment focus, particularly when symptoms cluster around separations from specific people, separation anxiety disorder may be the underlying pattern. The reframe is treatment-relevant — attachment-focused approaches work better than generic anxiety treatment when this is the core.