Why does ADHD lead to racing thoughts and worry?

PostedNovember 19, 2025

UpdatedNovember 21, 2025

ByMy Patient Advice

Author: Harriet Winslow, BSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Many people with attention deficit hyperactivity disorder (ADHD) describe their minds as “always on,” filled with constant ideas, worries, and background chatter. According to NHS guidance on adult ADHD, this mental restlessness is a recognised feature of the condition and can make relaxation or focus difficult. Recent studies, including research published in BJPsych Open, suggest that racing thoughts and overthinking stem from the brain’s regulation of dopamine and its impact on attention and emotion.

The neurobiology of racing thoughts

ADHD is associated with differences in how dopamine and noradrenaline work in the brain, particularly in areas that control attention and emotion. These chemical changes can make it harder to filter or prioritise thoughts. As a result, people may experience an ongoing stream of ideas or worries that feel impossible to switch off.

Executive function difficulties also play a role. Adults with ADHD often struggle to organise, plan, or redirect attention once a thought pattern starts, which can make worry loops or “mental noise” more persistent. The Royal College of Psychiatrists notes that emotional dysregulation further intensifies this effect, amplifying anxiety and restlessness.

ADHD, anxiety, and cognitive hyperactivity

Racing thoughts in ADHD overlap closely with anxiety and rumination. Both involve overactive thinking, restlessness, and difficulty relaxing, especially at night. A 2025 study in PubMed found that adults with ADHD and anxiety experience stronger correlations between mind wandering, intrusive thoughts, and hyperarousal. Poor sleep and stress often make these symptoms worse, creating a feedback loop between cognitive overactivity and emotional tension.

Managing worry and thought racing

NICE guidance (NG87) recommends an integrated approach that combines medication, psychological therapy, and psychoeducation. ADHD-adapted cognitive behavioural therapy (CBT) and mindfulness are particularly effective for reducing overthinking, improving emotional control, and promoting focus. Psychoeducation and behavioural coaching can also help people recognise unhelpful thinking patterns and develop strategies for calm and concentration.

Key takeaway

Racing thoughts and worry in ADHD are linked to dopamine regulation, executive function difficulties, and emotional hyperactivity. By using evidence-based interventions such as CBT, mindfulness, and structured routines, supported by guidance from NHS and NICE, individuals can learn to quiet the mental noise and achieve better emotional balance.

Harriet Winslow, BSc

Author

Harriet Winslow is a clinical psychologist with a Bachelor’s in Clinical Psychology and extensive experience in behaviour therapy and developmental disorders. She has worked with children and adolescents with ADHD, autism spectrum disorder (ASD), learning disabilities, and behavioural challenges, providing individual and group therapy using evidence-based approaches such as CBT and DBT. Dr. Winslow has developed and implemented personalised treatment plans, conducted formal and informal assessments, and delivered crisis intervention for clients in need of urgent mental health care. Her expertise spans assessment, treatment planning, and behavioural intervention for both neurodevelopmental and mental health conditions.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.