Aggression

Children with ADHD are more often aggressive due to impulsivity, emotional dysregulation, and poor frustration tolerance. They may react quickly when upset, have difficulty managing strong emotions, and struggle to consider consequences before acting. Aggressive behaviors are frequently seen during transitions, periods of frustration, or during interpersonal conflicts. This type of aggression often improves if ADHD symptoms are well treated with medication. When evaluating aggression, assess for symptoms of inattention, hyperactivity, and impulsivity.

Children who have experienced trauma may present with aggression related to irritability and emotional reactivity. Aggressive behavior can reflect a heightened sense of threat and difficulty regulating emotions. Additional signs may include hypervigilance, sleep disturbances, avoidance, anxiety, toileting accidents, regression, withdrawal, and difficulties with trust or attachment. A trauma history should be taken for all aggression and should be considered when aggression appears disproportionate to the situation, represents a distinct change from prior behavior, or develops following a significant stressor.

Substance use can present with new or worsening aggression. Intoxication, withdrawal, and substance-related lifestyle changes can contribute to irritability, poor judgment, and behavioral dysregulation. Warning signs may include changes in peer groups, declining academic performance, mood changes, secrecy, or legal problems.

Bipolar disorder can present with significant irritability and aggression, particularly during manic or mixed episodes. Aggression may occur in the setting of decreased need for sleep, elevated or irritable mood, increased energy, impulsivity, grandiosity, and/or racing thoughts. A key distinguishing feature is the episodic nature of symptoms. Youth with bipolar disorder may also experience episodes of depression.

DMDD is characterized by chronic irritability, dysphoria, and severe temper outbursts that are out of proportion to the situation and developmental level of the child. Outbursts occur frequently and are accompanied by a persistently negative mood between episodes. Unlike bipolar disorder, symptoms are chronic rather than episodic. Children with DMDD frequently present with significant aggression during emotional outbursts which leads to impairment at home, school, and/or social settings.

Depression in children and adolescents often presents as increased irritability. Youth experiencing depression may have a lower frustration tolerance and be prone to verbal or physical outbursts. Other symptoms may include changes in sleep, appetite, energy, concentration, academic performance, or interest in previously enjoyable activities. Screening for depression should be considered when aggression is accompanied by mood changes or social withdrawal.

Children with autism spectrum disorder may become aggressive when overwhelmed, unable to communicate their needs, experiencing sensory distress, or coping with changes in routine. Aggression is often reactive rather than premeditated and is typically preceded by escalating signs of distress. Similar outbursts can occur in children with intellectual disability, language disorders, learning disorders or other neurodevelopmental conditions. A developmental history and assessment of communication skills, adaptive functioning, and sensory sensitivities can be helpful in clarifying the underlying cause of aggressive behavior. It may also be helpful to attempt to discern a common trigger for these behaviors, such as a certain school subject.

Children with ODD demonstrate a persistent pattern of irritability, defiance, and conflict with authority figures. Aggressive behavior may occur during arguments or when limits are set, although physical aggression is not required for the diagnosis. ODD commonly co-occurs with ADHD, and sometimes with anxiety or mood disorders, making a thorough assessment of underlying contributors particularly important.

Conduct disorder should be considered when aggression is severe, premediated, or associated with significant violations of the rights of others. Behaviors may include bullying, physical fights, cruelty to animals, property destruction, theft, or serious rule violations. These youth often require a more comprehensive assessment and more intensive treatment due to the increased risk of legal, academic, and social difficulties.

Anxiety can sometimes present as irritability and aggression, particularly in younger children. Aggressive behavior typically occurs when an anxious child is overwhelmed, confronted with a greatly-feared situation, or struggling to communicate distress. Aggression typically occurs in conjunction with avoidance behavior. Symptoms such as excessive worry, reassurance-seeking, somatic complaints, separation difficulties, or social fears also suggest an underlying anxiety disorder.

Psychotic disorders are uncommon in children and adolescents but should be considered when aggression occurs in the context of hallucinations, delusional beliefs, paranoia, or significant thought disorganization. Sometimes aggression may occur as a consequence of command hallucinations to harm others. New-onset psychotic symptoms warrant prompt psychiatric evaluation.

Medical causes should be considered when aggression develops suddenly, is accompanied by unprecedented cognitive or neurologic changes, or represents a marked departure from baseline functioning. Potential contributors include sleep disorders, seizure disorders, traumatic brain injury, thyroid dysfunction, medication effects, chronic pain, and other medical conditions. A thorough medical history and review of systems can help identify contributors to behavioral change.