Why Do Some People With ADHD Have Emotional Outbursts?

The study suggests that emotional outbursts in people with ADHD may be linked to specific differences in the brain. These difficulties are not only behavioral but also biological, indicating that ADHD can affect both attention and emotional regulation.

Attention deficit hyperactivity disorder, known as ADHD, is quite common, especially in children, and can affect different areas of life, such as school performance and relationships.

Although the diagnosis is generally associated with difficulties in attention, impulsivity, and hyperactivity, many individuals with ADHD also face intense problems managing their own emotions. In some cases, this manifests as strong and difficult-to-control emotional outbursts, which can significantly impact daily life.

These emotional outbursts are not always linked to other behavioral disorders, such as those associated with constant irritability. This raises an important question: are these emotional difficulties part of ADHD itself or are they a separate problem? Some researchers believe that ADHD may be broader than previously thought, involving not only behavior but also how the brain processes emotions.

To investigate this, scientists have used brain imaging scans, which allow them to observe both brain structure and function. Previous studies had already suggested that people with ADHD may exhibit differences in certain brain regions, such as areas responsible for behavioral control, attention, and decision-making. Alterations have also been observed in regions linked to motivation and emotions.

The researchers primarily used brain imaging scans, such as magnetic resonance imaging (MRI), to analyze both the structure and function of the brains of children with ADHD. These scans allow them to observe the size of different brain regions and how they communicate with each other during rest or activity.

In addition, groups of children with different levels of emotional difficulty were compared to identify possible specific differences associated with emotional outbursts.

In some cases, statistical analyses have also been applied to assess connection patterns between brain areas and the volume of regions important for emotional control, such as parts of the brain responsible for regulating impulses and emotional responses.

However, the results of these studies are not always consistent. Some research has found clear patterns of brain changes, while others have not identified such evident differences. This may be because ADHD is not the same for everyone; some people have more difficulty paying attention, while others have greater impulsivity or emotional problems. This variety of symptoms can make it difficult to identify a single pattern in the brain.

An important point highlighted by the researchers is that emotional difficulties are often not included in the assessments of these studies. In other words, many studies analyze ADHD without considering how much trouble the person has regulating emotions. This may explain why the results are so varied, since individuals with different profiles end up being analyzed together.

This figure illustrates how different groups of children, those without ADHD (NT), with ADHD (ADHD), and with ADHD accompanied by significant emotional outbursts (ADHD + IEO), exhibit differences in how brain regions communicate with each other, which scientists call functional connectivity. The colored areas indicate where this communication is stronger or weaker between the groups. Much of this difference appears in specific brain networks, such as the default mode network (DMN), linked to internal thoughts, as well as other important networks like the dorsal attention network (DAN), the frontoparietal network (FPN), the limbic network (LIM), the salience network (SAL), the somatosensory network (SOM), and the visual network (VIS). The analysis used rigorous statistical methods (RFT and FWE correction) to ensure that the results did not occur by chance. The results show that children with ADHD and emotional outbursts (EOI) exhibit reduced communication between certain brain areas compared to children with ADHD without these outbursts, and that this reduction is associated with more impulsive and difficult-to-control behaviors. In short, the figure demonstrates that these emotional difficulties are related to specific alterations in brain networks.

In the few studies that have focused specifically on emotional outbursts, differences were found in brain regions linked to emotions, such as those responsible for reacting to stimuli and controlling emotional responses.

Alterations were also observed in areas of the frontal part of the brain, which help regulate behaviors and emotions. In some cases, these regions showed reduced size or different functioning in people with greater emotional difficulties.

These findings suggest that emotional outbursts in ADHD may have their own biological bases, different from those related only to attention or impulsivity. In other words, the brain may function differently when it comes to emotions, which helps explain why some people with ADHD have more emotional difficulties than others. This reinforces the importance of considering not only the classic symptoms, but also the emotional aspect in diagnosis and treatment.

READ MORE:

Mapping latent neuroanatomical substrates of behavioral and emotional dysregulation in ADHD

Shinwon Park, Margaret Benda, Anthony Mekhanik, Michael P. Milham, Seok Jun Hong, and Amy Krain Roy

Psychological Medicine. 2026;56:e48. 

doi:10.1017/S003329172510278X

Abstract:

Children with attention-deficit/hyperactivity disorder (ADHD) frequently exhibit impairing emotional dysregulation along with inattention and hyperactivity. We aim to parse the heterogeneity of behavioral and emotional dysregulation in ADHD using latent brain factors based on cortical thickness (CT), and examine associated differences in intrinsic functional connectivity (iFC). Data were collected from 123 children (39 ADHD, 47 ADHD with impairing emotional outbursts [ADHD + IEO], 37 neurotypical controls [NT], 5–9.9 years old). First, exploratory factor analysis revealed latent behavioral factors. Using Latent Dirichlet allocation, we decomposed heterogeneous CT patterns into parsimonious latent brain factors. We further investigated the functional relevance of brain regions showing structural differences in the ADHD + IEO group and examined associations between brain and behavioral latent factors. Among the four behavioral factors identified (Externalizing, Emotion Dysregulation, Internalizing, and Surgency/Impulsivity), the dominant factor – Externalizing behavior – significantly differentiated the ADHD + IEO from the ADHD and NT groups. A conjunction analysis of the three brain factors revealed significantly thicker CT in the dorsolateral prefrontal cortex for ADHD + IEO compared to NT. Using this region as a seed, we found reduced functional connectivity primarily in the default mode network, which differentiated ADHD + IEO and ADHD groups. Structural brain and iFC measures showed significant associations with the Externalizing behavior factor. Parsing the neurobiology underlying the heterogeneous presentation of ADHD requires integrating multiple modalities and analytical methods. This study demonstrates that combining behavioral, structural, and functional data reveals unique neural features associated with behavioral and emotional dysregulation.