What role do polychlorinated biphenyls (PCBs) play in ADHD?

PostedAugust 20, 2025

UpdatedSeptember 4, 2025

ByMy Patient Advice

Author: Victoria Rowe, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Studies increasingly suggest a link between PCBs with ADHD risk and impaired brain development. Polychlorinated biphenyls (PCBs) are industrial chemicals that remain in the environment and accumulate in the body, even many decades after they were banned. This chemical exposure has been associated with attention problems, hyperactivity, and emotional difficulties in children’s hallmark traits of ADHD.

Recognising the neurobehavioural impact of such environmental toxins is crucial for prevention and early intervention.

How PCBs Influence ADHD Risk

Here is how PCBs ADHD connections are thought to occur.

Disruption of brain development

PCBs interfere with hormones and neurotransmitters essential for developing attention and impulse control leading to potential neurobehavioural impact.

Prenatal and early-life vulnerability

Infants exposed to PCBs during pregnancy or through breast milk may be particularly at risk, as their nervous systems are more sensitive to chemical exposure.

Long-lasting effects

Because PCBs persist in the body and environment, their effects can be subtle but lasting and may contribute to learning difficulties and ADHD-like symptoms.

Not the sole cause

While PCBs can increase risk, genetics, stress, and other environmental toxins also play roles in ADHD development.

Limiting exposure such as avoiding contaminated fish, testing soil or older building materials, and supporting environmental clean-up can help reduce risks. Visit providers like ADHD Certify for personal consultations and advice on managing exposure.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Environmental influences.

Victoria Rowe, MSc

Author

Victoria Rowe is a health psychologist with a Master’s in Health Psychology and a BS in Applied Psychology. She has experience as a school psychologist, conducting behavioural assessments, developing individualized education plans (IEPs), and supporting children’s mental health. Dr. Rowe has contributed to peer-reviewed research on mental health, including studies on anxiety disorders and the impact of COVID-19 on healthcare systems. Skilled in SPSS, Minitab, and academic writing, she is committed to advancing psychological knowledge and promoting well-being through evidence-based practice.

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.