Does ADHD affect whether someone does a breast self-check, attends a mammogram, books a smear test, respond to requests for bowel samples or prostate cancer or testicular screens? It’s a reasonable question — and, as of now, one nobody has directly answered. We could not find any published study linking ADHD specifically to cancer screening or self-examination behaviour. But two separate bodies of research point at the same conclusion from different directions, and the gap between them is worth understanding.
What we know: ADHD and missed healthcare contact
A 2024 study using Scottish general practice data is the clearest evidence we have. Researchers analysed records from 136 practices covering 824,374 patients, identifying 2,452 with a recorded ADHD diagnosis and matching each to five controls by age and sex. After adjusting for how many appointments people had actually booked, adults with ADHD were 90% more likely to miss a scheduled GP appointment than matched controls (OR = 1.9, 95% CI 1.7–2.2); for under-18s the figure was 60% (OR = 1.6, 95% CI 1.4–1.9). Nearly two in five adults with ADHD missed at least one appointment a year.
The proposed mechanism is executive dysfunction — the same planning, initiating, and memory difficulties that show up everywhere else in ADHD. Booking a screening appointment, remembering it’s happening, and following through on a self-check all draw on exactly those skills.
What we know: mental illness and cancer screening uptake
Separately, a meta-analysis in the British Journal of Psychiatry pooled 24 studies covering 715,705 women to ask whether mental illness predicts lower mammography uptake. It does, and the effect scales with severity: any mental illness carried an OR of 0.71, mood disorders 0.83, and severe mental illness 0.54 — women with SMI had roughly half the odds of being screened compared with the general population. The authors estimated this gap results in around 90 preventable breast cancer deaths annually in the UK, largely because cancer is caught later when screening is missed.
Notably, the same analysis found no significant link between short-term distress or anxiety alone and screening uptake — so it isn’t simply that feeling anxious puts people off. The authors point instead to help-seeking behaviour, continuity of care, and possibly cognitive load as more likely explanations, which lines up with the executive-function story from the ADHD appointments data.
The gap in the middle
Nobody has yet run the study that connects these two dots directly for ADHD: does the appointment-missing pattern extend to opportunistic self-checks and organised screening programmes, and if so, by how much? Both existing bodies of evidence point the same way, but ADHD wasn’t analysed as its own category in the mammography meta-analysis, and the GP appointments study didn’t track screening-specific attendance separately from general practice contact.
Until that research exists, we are not sure if the way we invite people for screening or the expectation for self-monitoring impacts outcomes at the interface of neurodivergence/mental health and physical health.
Why it matters regardless
Even without a direct study, the practical implication holds up: a group known to have above-average difficulty with appointment follow-through is being invited into screening systems that assume follow-through. For clinicians, that’s a case for building reminder systems, simplified booking, and proactive follow-up into how ADHD patients are invited to routine screening, not waiting for non-attendance to become someone else’s problem. Many services are really working on follow through with all clients but it would help if we knew how many people were missing out and whether we need to be doing more or different.
Sources: Ellis et al., “Attention-deficit/hyperactivity disorder and serial missed appointments in general practice,” PLOS Mental Health; Mitchell et al., “Breast cancer screening in women with mental illness: comparative meta-analysis of mammography uptake,” The British Journal of Psychiatry.
