“Is ADHD caused by trauma?”

No.

ADHD is highly genetic (about 80% hereditary¹) and is not caused by trauma, abuse, or “bad parenting”.

But here’s what makes this confusing: research shows that people with ADHD are actually more likely to experience adverse childhood events². And not because trauma causes ADHD, but because having ADHD as a child can set you up for more difficult experiences.

This happens in a few ways.

Undiagnosed neurodivergent parents may struggle with their own unmet needs and develop maladaptive coping mechanisms like substance abuse, creating a more chaotic home environment. Kids with ADHD also face more challenges in non-affirming school settings, experience more bullying, and encounter more ableist treatment. ADHD traits can also lead to increased risk-taking behaviours, which can often lead to traumatic experiences.³

These, of course, add extra struggles on top of the neurodivergent experience, but they do not cause the neurodivergence. The ADHD comes first; the additional trauma often follows.

It’s crucial to understand this distinction. Attributing ADHD symptoms to trauma alone means someone might not get the support they actually need. Trauma and ADHD can, and should, be addressed separately, but they require different approaches. Trauma deserves healing, and ADHD deserves recognition and accommodation. One doesn’t negate or explain away the other.

If ADHD is not caused by trauma, why does this myth persist?

As Dr Russell Barkley explains, despite hundreds of studies showing otherwise, some people still propagate the trauma-based theories of ADHD. “[It] does real harm as it contradicts what the scientific literature is telling us.“⁴

These oversimplified explanations ignore the complex relationship between ADHD and adverse experiences, potentially preventing people from getting an accurate diagnosis and appropriate support.

Then what causes ADHD if not trauma?

Short answer: we don’t know.

What we do know is that our bodies definitely do not have a simple ADHD switch that can be turned on or off with a simple and easy lifestyle change like eliminating one single food type from a diet.

According to a meta-analysis from 2012⁵, “No single risk factor explains ADHD. Both inherited and noninherited factors contribute and their effects are interdependent. ADHD is familial and heritable.”

And yes, studies have found co-existing factors that are more prevalent when ADHD is present, but as the same study says, “[t]here is a large literature documenting associations between ADHD and a wide variety of putative environmental risks that can, at present, only be regarded as correlates.” Gene variants, extreme early adversity and premature birth “have been most consistently found as risk factors, but none are yet known to be definitely causal“.⁵

Also, the answer might be an even simpler than “this ONE thing causes ADHD”. Maybe it just is.

When considering the genetics of ADHD, a 2018 study⁶ went as far as to say that “ADHD, while usefully conceptualized as a disorder in clinical practice, can be viewed as a trait. Recent genome-wide association study findings, consistent with twin studies, highlight that ADHD lies at the extreme end of a continuously distributed dimension, akin to hypertension along the continuum of blood pressure.”

This is in accordance with why the neurodivergence framework, as we move away from pathologising possible variances in human experience and adapt accommodations that are not about “curing” an “illness”, but meeting a fellow human’s needs.