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Understanding conduct disorder: Symptoms, causes, and treatment

Understanding conduct disorder: Symptoms, causes, and treatment

Your 12-year-old son keeps getting in trouble at school — for picking on his classmates, lying to his teacher, and even stealing other kids’ things. You think he’s just “acting out.” Until you find out he’s been sneaking out at night for the last 6 months. 

It becomes apparent that your son isn’t just acting out or going through a phase. He’s repeatedly breaking the rules, being deceitful, and acting aggressively toward others.

If this truly describes your child, they might have conduct disorder. Let’s learn more about this mental health disorder, including signs and symptoms, types, causes, and treatment. But from the jump: Know that conduct disorder is treatable and your child can learn to manage these behavior problems.

What Is Conduct Disorder?

Conduct disorder is a mental health disorder that’s characterized by a pattern of behavior that violates the basic rights of others, societal norms, or rules and regulations — or, to put it simply, disorderly conduct. Those with conduct disorder might show aggression toward people and animals, destroy property, lie and steal, and/or break the rules.

Most often, conduct disorder is diagnosed in children and adolescents. Diagnosis after the age of 16 is rare; however, it can persist into adulthood (more on this later). Sometimes called juvenile delinquency, conduct disorder’s behavior patterns often cause disciplinary action from parents and teachers, in addition to the juvenile justice system.

Is Conduct Disorder a Mental Illness?

Yes. Conduct disorder is listed in the “Disruptive, Impulse-Control, and Conduct Disorders” section of the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). This is a book on mental disorders used by mental health professionals for assessment and diagnosis.

Types of Conduct Disorder

Conduct disorder is broken out into two major subtypes, based on the age of onset: childhood-onset type and adolescent-onset type. In each subtype, the disorder can be mild, moderate, or severe. 

Important note: Because many of the behaviors of individuals with conduct disorder are hidden, parents and caregivers may not report the initial symptoms and often overestimate the year conduct disorder began. In fact, estimates are often two years later than the actual onset.

With childhood-onset type, individuals display at least one symptom of conduct disorder before age 10. This type of conduct disorder is typically diagnosed in males.

These children are more likely to have continuous conduct disorder that develops into adult antisocial personality disorder than individuals with adolescent-onset type.

With adolescent-onset type, individuals don’t display symptoms of conduct disorder until after the age of 10 in adolescence. When compared to individuals with childhood-onset type, these individuals are less likely to show aggressive behaviors. They usually…

  • Have more normal peer relationships than that of childhood-onset type.
  • Often show conduct problems while they’re with others.
  • Are less likely to have persistent conduct disorder or develop an adult antisocial personality disorder.

Additionally, there is unspecified onset, in which the diagnostic criteria for conduct disorder are met, but it isn’t clear whether symptoms began before or after the age of 10.

What Are Signs of Conduct Disorder?

Conduct disorder symptoms can look different from one person to the next – as mentioned earlier, one’s conduct disorder might manifest as aggression toward people and animals, the destruction of property, deceit and theft, or the violation of rules.


Signs of aggression in those with conduct disorder can include:

  • Bullying, intimidating, and threatening others
  • Starting physical fights
  • Using weapons that can physically harm others
  • Being physically cruel to people and/or animals
  • Stealing from another person while engaging in the aggressive act
  • Sexually assaulting someone


Signs of destruction in those with conduct disorder can include:

  • Setting fires, with the goal of causing serious damage
  • Deliberately destroying someone else’s property using other means

Deceit and Theft

Some individuals with conduct disorder will lie and steal. This can include:

  • Breaking into another person’s house, building, or vehicle
  • Lying often or conning others to get something they want
  • Stealing things without confronting a victim

Violation of the Rules

Those with conduct disorder might violate the rules by:

  • Staying out past curfew
  • Running away from home at night
  • Skipping school 

Those with conduct disorder experience significant impairment at school, at work, and/or in their relationships. Note: If the individual is 17 or older, it’s important to rule out the possibility of antisocial personality disorder

What Causes Conduct Disorder?

As with most mental health disorders, there is not one cause of conduct disorder. Instead, there are multiple factors that can play a role in its development. 

Risk factors for conduct disorder can be broken into a few main groups:

Temperamental factors, such as a baby’s temperament being under-controlled or the individual having a lower than average intelligence.

Environmental factors include parental rejection or neglect, harsh discipline, physical or sexual abuse, lack of supervision. There are environmental factors at the community level, too, that can come into play, like peer rejection or being friends with others who engage in delinquent activity.

Genetic and physiological factors, in which an individual’s parent or sibling has conduct disorder, or a number of other mental health disorders, such as alcohol use disorder, ADHD, or mood disorders like depression and bipolar disorder. In addition, experts have noted a slower resting heart rate and structural as well as functional differences in certain brain areas in individuals with conduct disorder. 

Can Conduct Disorder Be Cured?

Conduct disorder can be difficult to overcome; however, it can be treated — and when there is support from parents, teachers, and others, conduct disorder is able to be successfully managed. 

Can a Child Outgrow Conduct Disorder?

Most children with conduct disorder (70%) do outgrow it by adolescence, according to the DSM-5. Again, though, intervention and professional treatment are important here. If a child has a support system that steps in to help, the child is better able to manage and eventually kick the behavior patterns characteristic of conduct disorder. 

Treatment for Conduct Disorder

How to cope with conduct disorder? Schedule a therapy session for your child or teen. Therapy is the most common and effective form of treatment. Through cognitive behavioral therapy (CBT), a child or teen can work through their negative attitudes, thoughts, feelings, and behaviors. They’ll learn how to better solve their problems, communicate well with others, manage stress, and control any aggressive impulses. 

Family therapy can also be valuable, as the whole family is often affected by the individual’s conduct disorder. This form of therapy can help to improve communication and interactions between family members. In addition, a family therapist can work with these individuals to address any potential contributing factors to the conduct disorder, such as those listed earlier (e.g., parental rejection or neglect). Parents can also be taught how to encourage positive behaviors vs. behavior problems in their children.

“According to [Psychiatrist Virginia A. Sadock, MD] other options for treatment may include pharmacological methods for reduction or control of symptoms such as aggression, irritability, impulsive behavior, and changes in mood,” says Tamiqua Jackson, Psychiatric Mental Health Nurse Practitioner (PMHNP) at Thriveworks. “The efficacy of some antipsychotics, neuroleptics, and antidepressants such as serotonin selective reuptake inhibitors (SSRIs) have been found to be useful in treating these symptoms.”

A medical and/or mental health professional can work with you and your child to determine what the best treatment approach is. And they’ll support you both throughout the process. 

  • Medical reviewer
  • Writer
  • Update history
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Tamiqua Jackson, PMHNPBoard-Certified Psychiatric Mental Health Nurse Practitioner
See Tamiqua's availability

Tamiqua Jackson is a Psychiatric Mental Health Nurse Practitioner (PMHNP) and Family Nurse Practitioner (FNP) in the states of North Carolina and Tennessee. Tamiqua has over 8 years of experience in advanced practice. She enjoys working with patients who may be experiencing depression, anxiety, attention deficit/hyperactivity disorder (ADHD), stress, sleep disorders, and other mental health issues that may affect everyday life. Tamiqua is compassionate and serves as a patient advocate.

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Taylor BennettSenior Content Strategist

Taylor Bennett is the Head of Content at Thriveworks. She received her BA in multimedia journalism with minors in professional writing and leadership from Virginia Tech. She is a co-author of “Leaving Depression Behind: An Interactive, Choose Your Path Book.”

We update our content on a regular basis to ensure it reflects the most up-to-date, relevant, and valuable information. When we make a significant change, we summarize the updates and list the date on which they occurred. Read our editorial policy to learn more.

  • Originally Published on June 19, 2017

    Author: Lenora KM

  • Updated on October 28, 2022

    Author: Taylor Bennett

    Reviewer: Tamiqua Jackson, PMHNP

    Changes: Added new content about what conduct disorder is, what its symptoms are, whether or not it’s a mental illness, effective treatment methods, and more; medically reviewed to confirm accuracy and enhance value.

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