October is ADHD Awareness Month. In the United States, the campaign is coordinated by a coalition of three organisations, CHADD, the Attention Deficit Disorder Association (ADDA) and the ADHD Coaches Organization, and many groups and media take part. For 2026, ADDitude magazine chose the theme "ADHD at the Center", with a simple message: "ADHD is complicated and connected." It is a good summary of what research has shown over the past year. ADHD is not only about attention: it is linked to reward, sleep, the heart, metabolism and even ageing.
To mark the month, here are nine recent findings we covered on this blog, each summarised in a few lines, with a link to the full article where you will find the details, the limits and the original sources.
1. Three Brain-Based Subgroups in Children with ADHD
A study in JAMA Psychiatry (February 2026) analysed brain scans from about 1,000 young people with ADHD and sorted them into three subgroups using brain data only, not symptoms. Two resembled the familiar inattentive and hyperactive/impulsive presentations; the third, the most severe, also had more persistent difficulties with emotional regulation. It is not a diagnostic scan, it included no adults, and it did not test which medication suits whom. Read: three types of ADHD, what the brain scan study really found.
2. "Low Dopamine" Is Too Simple
A review of more than 40 years of research (MacDonald and colleagues, Frontiers in Psychiatry, 2024) found clear evidence that dopamine is involved in ADHD, but little evidence for a simple dopamine shortage. People with rare genetic dopamine deficiencies develop movement disorders rather than typical ADHD, and brain imaging results point in both directions. It is a good reason to be wary of products that promise to "boost" your dopamine. Read: is ADHD really "low dopamine"?
3. Stimulants Act on Alertness and Reward
A study in Cell (2025) by Nico Dosenbach's team at WashU Medicine compared brain connectivity in 5,795 children aged 8 to 12, with and without a stimulant on the day of their scan. The medication changed networks linked to alertness and to how rewarding a task feels, not the attention networks, and it partly offset the brain signature of short sleep. Stimulants still help many people: the study changes the explanation, not the advice. Read: ADHD stimulants do not target attention.
4. Reward in ADHD and Autism: Opposite Directions?
A 2026 meta-analysis in Molecular Psychiatry, pooling 29 brain imaging studies, suggests that when a reward arrives, some deep brain regions tend to respond more than usual in ADHD and less than usual in autism. It brings together fairly small studies, so this picture may still change. Read: opposite reward responses in ADHD and autism.
5. Before Birth: the Placenta
A University of Iowa study in JAMA Psychiatry (September 2026) measured placental growth factor (PlGF) in banked blood samples from 176 pregnancies. When PlGF did not show its usual rise in the third trimester, the child was more likely to receive an ADHD diagnosis later. It is a small, single-centre association, not a cause, and it says nothing about anything a parent did or could have controlled. Read: placental health and ADHD.
6. The Heart: Shared Genes
A genome-wide study published in November 2025 found 15 genetic regions shared between ADHD and five cardiovascular diseases. Its genetic analyses suggest that inherited ADHD risk may raise the risk of heart disease, partly through body weight and smoking, two factors that can be changed. These are population patterns, not a prediction for any one person. Read: ADHD and your heart.
7. Early-Onset Type 2 Diabetes
Data presented at the EASD diabetes congress in Milan (September 2026) found an ADHD diagnosis in 14.4% of people diagnosed with type 2 diabetes before age 20, against 6.9% of matched peers without diabetes. These are conference data from US health records, not yet a peer-reviewed paper, and they show an association, not a cause. Read: ADHD and early-onset type 2 diabetes.
8. Sleep and the Body Clock
A perspective paper in the journal SLEEP (July 2026), written from lived experience, brought together what is known: between 25% and 40% of adults with ADHD report a sleep disorder, and about 30% describe a late body clock. Poor sleep and low mood seem to feed each other, and the authors call for sleep support adapted to neurodivergent people rather than rigid rules. Read: sleep, body clock and mental health in autism and ADHD.
9. Later Life: Memory and Thinking
A University of Pittsburgh study published in JAMA Psychiatry on 7 October 2026, based on more than 187,000 adults aged 50 and over in the US All of Us research program, linked ADHD to a higher likelihood of later cognitive impairment or dementia. It is an association, not proof that ADHD causes dementia, and many questions, including the role of treatment, remain open. Read: ADHD and cognitive impairment in later life.
What This Means for You
Put together, these findings point the same way as this year's awareness theme: ADHD is connected to the whole body and the whole lifespan, and it varies a lot from one person to another. None of them is a reason to worry about your own future. Most are associations seen in large groups, and several are early results. But they are good reasons to take ADHD seriously, to look after sleep, movement and heart health, and to mention ADHD to your doctor at check-ups.
If you recognise yourself in some of this, the free ASRS-v1.1 adult ADHD screener (18 questions, about 10 minutes) is a useful first step. A screening test is not a diagnosis, but it can help you put words on your experience and prepare a conversation with a professional. If you face a long wait for an assessment, our guide on what to do while you wait may help. And for everyday life, our free ADHD tools include a daily planner built around three must-dos and a task breaker that turns the task you keep postponing into small steps.
Source: ADHD Awareness Month, October 2026: ADHD Awareness Month Coalition (CHADD, ADDA, ADHD Coaches Organization), adhdawarenessmonth.org; CHADD, chadd.org; ADDitude, "ADHD Awareness Month 2026: ADHD at the Center", additudemag.com/adhd-awareness-2026. Each finding summarised above is described in detail in the linked article, with its full source (authors, journal, year, DOI where available, sample size and study design).