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

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.