Internalizing Disorders
Internalizing disorders represent an important group of emotional and mental health conditions that frequently emerge during childhood and adolescence. They are characterized primarily by internally experienced emotional distress, such as anxiety, fear, worry, sadness, and social withdrawal, and may affect a child’s social, family, and academic functioning.
Conditions commonly discussed within this group include Separation Anxiety Disorder, Generalized Anxiety Disorder (GAD), Specific Phobia, and other anxiety-related conditions. Obsessive-Compulsive Disorder (OCD), although classified separately from anxiety disorders in DSM-5, may also present with significant internalizing symptoms.
Separation Anxiety Disorder
Clinical Presentation
Separation Anxiety Disorder is characterized by developmentally inappropriate and excessive fear or anxiety concerning separation from individuals to whom the child is strongly attached, most commonly parents or caregivers.
Children may experience intense distress when anticipating or experiencing separation and may report physical symptoms such as headaches, nausea, or abdominal discomfort. Difficulties may become particularly noticeable when attending school, sleeping away from caregivers, or participating in activities independently.
Diagnostic Features
According to DSM-5 criteria, Separation Anxiety Disorder involves developmentally inappropriate and excessive fear or anxiety concerning separation from attachment figures, with at least three characteristic symptoms.
These may include:
• Excessive distress when anticipating or experiencing separation
• Persistent worry about losing an attachment figure or possible harm occurring to them
• Persistent worry about events that could cause separation
• Reluctance or refusal to leave home, attend school, or go elsewhere because of separation fears
• Difficulty being alone or without attachment figures
• Reluctance to sleep away from home or without an attachment figure nearby
• Recurrent nightmares involving separation
• Physical symptoms when separation occurs or is anticipated
In children and adolescents, symptoms persist for at least four weeks and cause clinically significant distress or impairment.
Etiology and Risk Factors
A combination of genetic, temperamental, family, and environmental factors may contribute to Separation Anxiety Disorder. Stressful life events, loss, significant changes in the family environment, and a family history of anxiety disorders may increase vulnerability.
Course and Prognosis
The course varies between individuals. Without appropriate intervention, significant separation anxiety may interfere with school attendance, independence, friendships, and family functioning. With appropriate psychological treatment and family support, symptoms can often be effectively managed.
Treatment
Cognitive Behavioural Therapy (CBT): Helps children gradually face separation-related fears, understand anxiety, and develop effective coping strategies.
Parent and Family Interventions: Parents and caregivers may be involved in treatment to support the child’s increasing independence and avoid unintentionally reinforcing anxiety-related avoidance.
Social Avoidance and Anxiety
Persistent avoidance of social situations in children may be associated with several different conditions and should be evaluated within the child’s developmental context. Social Anxiety Disorder, for example, involves marked fear or anxiety about social situations in which the individual may be observed or evaluated by others.
Children experiencing significant social anxiety may avoid speaking in groups, interacting with unfamiliar people, participating in school activities, or developing relationships with peers.
Persistent avoidance of social situations in children may be associated with several different conditions and should be evaluated within the child’s developmental context. Social Anxiety Disorder, for example, involves marked fear or anxiety about social situations in which the individual may be observed or evaluated by others.
Children experiencing significant social anxiety may avoid speaking in groups, interacting with unfamiliar people, participating in school activities, or developing relationships with peers.
Assessment
A comprehensive psychological assessment considers:
• The situations that trigger fear or avoidance
• Fear of criticism, embarrassment, rejection, or negative evaluation
• The duration and severity of symptoms
• The child’s developmental stage
• Effects on friendships, family relationships, school participation, and everyday functioning
Treatment
Cognitive Behavioural Therapy (CBT): Can help children and adolescents understand anxious thoughts, gradually approach feared situations, and develop social and coping skills.
Group-Based Interventions: In selected cases, structured group interventions can provide opportunities to practise social skills and gradually increase confidence in interpersonal situations.
Generalized Anxiety Disorder (GAD)
Clinical Presentation
Generalized Anxiety Disorder is characterized by excessive anxiety and worry about multiple areas of everyday life. In children and adolescents, worries may involve school performance, family, friendships, health, future events, or other everyday situations.
Children may find it difficult to control their worry and may experience physical tension, irritability, fatigue, concentration difficulties, or sleep disturbance.
Diagnostic Features
Etiology and Risk Factors
Generalized Anxiety Disorder is associated with a combination of genetic, psychological, temperamental, and environmental factors. Stressful experiences and patterns of heightened sensitivity to uncertainty or threat may also contribute.
Course and Prognosis
GAD can persist if untreated and may affect academic performance, relationships, sleep, and emotional well-being. Appropriate psychological intervention can significantly reduce symptoms and improve functioning.
Treatment
Cognitive Behavioural Therapy (CBT): One of the principal evidence-based psychological treatments for anxiety disorders in children and adolescents.
Medication: In moderate to severe cases, particularly when psychological treatment alone is insufficient, medication may be considered following appropriate medical assessment. SSRIs are among the medications commonly considered for paediatric anxiety disorders when pharmacological treatment is indicated.
Specific Phobia
Clinical Presentation
Specific Phobia is characterized by marked fear or anxiety about a particular object or situation, such as animals, heights, injections, blood, storms, darkness, or other specific triggers.
In children, fear or anxiety may be expressed through crying, tantrums, freezing, or clinging.
Diagnostic Features
The main DSM-5 diagnostic features include:
• Marked fear or anxiety about a specific object or situation
• The phobic stimulus almost always provokes immediate fear or anxiety
• The situation or object is actively avoided or endured with intense distress
• The fear is disproportionate to the actual danger posed, taking sociocultural context into account
• Symptoms are persistent, typically lasting six months or longer
• The condition causes clinically significant distress or impairment
Etiology and Risk Factors
Specific phobias may develop through a combination of genetic vulnerability, temperament, learning processes, environmental influences, and, in some cases, frightening or traumatic experiences.
Course and Prognosis
Without treatment, avoidance can persist and interfere with everyday activities. Appropriate psychological intervention can substantially reduce fear and avoidance.
Treatment
Exposure-Based Therapy: Gradual, structured exposure to the feared stimulus is a central evidence-based psychological intervention for specific phobias.
Cognitive Behavioural Therapy (CBT): Cognitive and behavioural strategies may be incorporated to help children understand and manage fear and avoidance.
Obsessive-Compulsive Disorder (OCD)
Clinical Presentation
Obsessive-Compulsive Disorder is characterized by the presence of obsessions, compulsions, or both.
Obsessions are recurrent and persistent thoughts, urges, or images that are experienced as intrusive and unwanted and commonly cause significant anxiety or distress.
Compulsions are repetitive behaviours or mental acts that an individual feels driven to perform in response to an obsession or according to rigidly applied rules.
In children, insight into the excessive or unreasonable nature of these thoughts and behaviours may be limited.
Diagnostic Features
According to DSM-5 criteria:
• Obsessions, compulsions, or both are present.
• Compulsions are typically performed in an attempt to reduce anxiety or prevent a feared event, although they may not be realistically connected to what they are intended to prevent.
• The obsessions or compulsions are time-consuming—typically taking more than one hour per day—or cause clinically significant distress or impairment.
• Symptoms are not attributable to substances or another medical condition and are not better explained by another mental disorder.
There is no DSM-5 requirement that OCD symptoms must persist for one month.
Etiology and Risk Factors
OCD is associated with genetic, neurobiological, psychological, and environmental factors. No single factor explains its development in every individual.
Course and Prognosis
OCD can significantly interfere with school, family relationships, social functioning, and everyday activities. Early recognition and evidence-based treatment can help reduce symptoms and improve functioning.
Treatment
Cognitive Behavioural Therapy with Exposure and Response Prevention (CBT/ERP): ERP is a first-line psychological treatment for OCD. It involves gradual exposure to anxiety-provoking triggers while learning to resist or reduce compulsive responses.
Medication: Selective Serotonin Reuptake Inhibitors (SSRIs) may be used when clinically indicated, particularly for moderate to severe OCD, following appropriate medical evaluation.