Behavioural Issues

Behavioural issues is a broad clinical specialty area covering challenging behaviors in children and adolescents — oppositional behaviour, aggression, defiance, conduct concerns, school refusal, and related presentations. Multiple evidence-based interventions exist for the underlying conditions producing these behaviors.

Overview

Behavioural issues is a broad clinical specialty area covering the diverse challenging behaviors that bring children and adolescents to mental-health attention. The category encompasses oppositional behaviour, aggression toward people or property, defiance of authority, conduct concerns, school refusal, lying, stealing, and a wide range of other presentations.

Behavioural issues are not a single DSM-5-TR diagnosis. They typically reflect underlying conditions that warrant evaluation and specific treatment. Common diagnoses producing behavioural presentations include Oppositional Defiant Disorder (313.81), Conduct Disorder (312.81), Disruptive Mood Dysregulation Disorder (296.99), ADHD, Autism Spectrum Disorder, Anxiety Disorders (often presenting as avoidance or oppositional behaviour in children), Major Depressive Disorder (often presenting as irritability in children), Trauma- and Stressor-Related Disorders, Intellectual Disability, Learning Disabilities, and others.

The clinical task is typically not “treating the behaviour” but identifying the underlying conditions or contributors driving the behaviour, then treating those. Many behavioural presentations in children are functional communications of distress, unmet needs, frustration about underlying difficulties (learning, sensory, regulatory), or trauma responses. Treating only the surface behaviour without addressing underlying drivers produces limited outcomes.

Evidence-based parent-management training programs (Parent-Child Interaction Therapy, The Incredible Years, Triple P, Defiant Children) substantially reduce behavioural problems in young children. Family therapy approaches (Multidimensional Family Therapy, Multisystemic Therapy, Functional Family Therapy) have evidence for adolescents. Treatment of underlying conditions (ADHD, anxiety, depression, autism, trauma) frequently produces meaningful behavioural improvement.

This page provides overview of behavioural-issues clinical area; for specific conditions, see our specialty pages on Oppositional Defiant Disorder, Conduct Disorder, ADHD, anger management, parenting, and other relevant specialty pages.

Signs and symptoms

Oppositional and defiant behaviour — Frequent loss of temper, argumentativeness, defiance of authority, refusal to comply with rules or requests, deliberate annoyance of others, blaming others.
Aggression toward people — Hitting, kicking, biting, threatening; verbal aggression; bullying; in severe cases use of weapons.
Aggression toward property — Destruction of property, damage to belongings, fire-setting in serious cases.
Rule violations — Lying, stealing, breaking rules at home or school, truancy, running away.
School refusal or avoidance — Reluctance to attend school, somatic complaints on school days, increased absenteeism — often anxiety-driven, sometimes depression or trauma-related.
Tantrums beyond age expectations — Severe tantrums in age groups where they would normally have decreased; meltdowns in older children and adolescents.
Difficulty with transitions — behavioural dysregulation during transitions; particularly characteristic of ADHD, autism spectrum, and anxiety.
Irritability and emotional dysregulation — Persistent irritability often masking depression in children; rapid escalation; difficulty calming once activated.
Sensory or regulatory difficulties — behaviour driven by sensory overwhelm, hunger, fatigue, or regulatory difficulties — particularly in children with autism, ADHD, or sensory processing differences.
Functional impairment — School suspensions, social difficulties, family disruption, daily functioning affected.

Causes and risk factors

Behavioural issues arise from interaction of multiple factors that warrant systematic evaluation:

Underlying mental-health conditions: Most behavioural issues reflect underlying conditions including ADHD, anxiety disorders, depression, autism spectrum, ODD, conduct disorder, learning disabilities, language disorders, OCD, trauma-related disorders, intellectual disability, sensory processing differences, sleep disorders.

Family factors: parenting practices, family conflict, parental mental illness, substance use, divorce/separation, trauma exposure, family disorganization all influence behavioural presentations.

Trauma exposure: ACE exposure substantially elevates rates of behavioural issues. Many “behavioural” presentations in trauma-affected children are better understood as trauma responses requiring trauma-informed care rather than purely behavioural approaches.

School environment: educational mismatch (curriculum too easy or too difficult), undiagnosed learning disabilities, social difficulties at school, bullying, teacher mismatch all contribute.

Developmental factors: some behavioural patterns are normative at certain developmental stages (toddler oppositionality, adolescent autonomy-seeking) but warrant evaluation when severity, persistence, or impairment exceed typical.

Medical and physical factors: sleep disorders, hunger, pain, medical conditions, side effects of medications, hearing or vision problems can all manifest as behavioural issues.

Communication and language: limited language ability often produces behaviour as communication; this is particularly relevant for children with intellectual disability, autism, language disorders, or trauma-affected language development.

Comorbidity: behavioural issues rarely reflect a single condition; comprehensive evaluation typically identifies multiple contributors that warrant integrated treatment.

Typical treatments

Effective treatment is matched to the underlying conditions identified through assessment:

Comprehensive assessment first: identifying the underlying condition(s) producing behavioural presentation. Includes mental-health evaluation; medical evaluation; cognitive and academic assessment when relevant; sensory and developmental assessment; family-system assessment; school consultation.

Parent management training programs:

Parent-Child Interaction Therapy (PCIT) — ages 2-7; strong evidence.
The Incredible Years — ages 3-8; strong evidence.
Triple P (Positive Parenting Program) — ages 0-16; tiered approach.
Defiant Children (Barkley) — school-age; strong evidence.

Family-systems approaches:

Multisystemic Therapy (MST) — adolescents with serious conduct concerns.
Multidimensional Family Therapy (MDFT) — adolescent substance use and behavioural issues.
Functional Family Therapy (FFT) — adolescent behavioural issues.

Treatment of underlying conditions:

ADHD treatment (stimulants, alpha-2 agonists, behavioural approaches) frequently produces dramatic behavioural improvement when ADHD is the underlying driver.
Anxiety treatment (CBT, exposure therapy, SSRIs when appropriate) for anxiety-driven behaviors.
Depression treatment (CBT, IPT, SSRIs when appropriate) for irritability-presenting depression.
Autism-specific interventions (social skills, sensory accommodations, communication supports).
Trauma-focused therapy (TF-CBT, EMDR) for trauma-affected children.
Learning disability assessment and educational accommodations.

Individual child therapy: Cognitive behavioural Therapy for school-age and adolescent children; play therapy adapted for younger children; problem-solving skills training.

School coordination: Individual Education Plans, behavioural support plans, accommodations; coordination between mental-health, family, and school.

Pharmacotherapy: Used for diagnosed conditions (ADHD, anxiety, depression, irritability with severe aggression). Not first-line for behavioural issues without identified condition.

Functional behaviour assessment: systematic identification of triggers, behaviors, and consequences to develop targeted intervention plans. Used in school settings, with developmentally disabled populations, and in some clinical contexts.

When to seek help

Professional evaluation is indicated when:

A child or adolescent shows persistent behavioural concerns beyond developmental norms.
Behavioural concerns are causing significant friction at home, school, or with peers.
The child has been suspended, expelled, or facing loss of placement.
Family functioning is severely affected.
You suspect underlying ADHD, autism, learning disability, anxiety, depression, or trauma.
Strategies that previously worked are no longer effective.
The child is increasingly aggressive, harming animals, fire-setting, or showing serious antisocial behaviour.
You as caregiver are experiencing significant stress, exhaustion, or burnout.

For youth: 1-800-668-6868 (Kids Help Phone). For caregivers under stress: 211 (local social services), 811 (Health Link). For mental-health crisis: 9-8-8 (Suicide Crisis Helpline). If a child is in immediate danger or threatening serious harm, contact emergency services. Most provinces have specialized child and adolescent mental-health services for behavioural issues, including assessment teams, intensive home-based programs, day treatment, and in severe cases residential treatment.

Frequently asked questions

Is my child's behaviour just a phase?

Some behavioural patterns are normative at certain developmental stages (toddler oppositionality, adolescent autonomy-seeking, early-school adjustment difficulties) and resolve with development. Persistent severe behaviour beyond developmental norms warrants evaluation — particularly if it lasts months, causes significant impairment, or involves harm.

How can I tell what is causing the behaviour?

Comprehensive evaluation by qualified clinician identifies underlying contributors. This typically includes mental-health assessment, medical evaluation, cognitive and academic assessment when relevant, sensory and developmental assessment. Many behaviors have multiple contributors warranting integrated treatment.

Is bad parenting the cause?

No. Behavioural issues have biological, temperamental, comorbid-condition, and environmental contributors. Parenting practices interact with these factors and can either help or amplify difficulties, but they are not the sole cause. Parent training works because it changes interaction patterns, not because parents were "bad."

Will my child outgrow this?

Depends substantially on the underlying conditions, severity, age of onset, treatment, and family/school support. Many behavioural issues improve with development and intervention. Childhood-onset Conduct Disorder, callous-unemotional traits, and untreated ADHD are associated with worse long-term outcomes if untreated.

Should we use medication?

Decisions are individualized based on identified diagnosis. Medication is appropriate for diagnosed conditions (ADHD, anxiety, depression, severe aggression with mood component) where evidence supports it. Medication for behaviour alone (without identified condition) is generally inappropriate. behavioural and family-based interventions are usually first-line.

How long does treatment take?

Parent-management training programs typically run 8-20 weeks. Family-systems treatments (MST, MDFT, FFT) typically run 4-6 months. Treatment of underlying conditions varies (ADHD often involves long-term medication; anxiety treatment 12-20 sessions; trauma treatment 12-20+ sessions). Sustained gains require ongoing application of skills.

References

American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.). APA.
Eyberg, S. M., et al. (2008). Evidence-based psychosocial treatments for children and adolescents with disruptive behaviour. Journal of Clinical Child & Adolescent Psychology, 37(1), 215–237.
Webster-Stratton, C. (2011). The Incredible Years: Parents, Teachers, and Children Training Series. The Incredible Years.
Henggeler, S. W., & Schaeffer, C. M. (2016). Multisystemic Therapy: Clinical overview, outcomes, and implementation research. Family Process, 55(3), 514–528.
Connor, D. F., et al. (2006). Psychopharmacology of disruptive behaviour in children and adolescents. Pediatric Drugs, 8(2), 83–101.

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The ShiftGrit Clinical Editorial Team combines the insight of registered psychologists, provisional psychologists, and trained writers to create accessible, evidence-informed therapy resources. All content is clinically reviewed by a Registered Psychologist.