Adults with ADHD can face a measurably shorter life expectancy compared to their peers, according to recent population-level research. A 2025 UK study estimated the gap at roughly 7 years for men and 9 years for women. But the researchers emphasize that modifiable health behaviors and undertreated co-occurring conditions, not ADHD itself, appear to drive most of that difference.
What does the research say about ADHD and life expectancy?
The largest study to date on this question is a 2025 matched cohort study from University College London (UCL), published in the British Journal of Psychiatry. Using UK primary care records from 792 general practices, the researchers identified 30,039 adults with diagnosed ADHD and compared them to 300,390 matched individuals without ADHD. The apparent reduction in life expectancy was 6.78 years for males (95% CI: 4.50 to 9.11) and 8.64 years for females (95% CI: 6.55 to 10.91) [1].
"It is deeply concerning that some adults with diagnosed ADHD are living shorter lives than they should." Josh Stott, University College London, 2025 [6]
This was not the first study to identify the pattern. A 2019 US follow-up study by Russell Barkley found that childhood ADHD (combined type) was associated with an estimated 8.4-year reduction in total life expectancy by young adulthood, with the gap widening to 12.7 years when ADHD persisted into adult life [3]. The two studies used different methods but reached broadly similar conclusions.
A lifespan review by Franke and colleagues (2018) noted that ADHD across the lifespan is characterized by substantial comorbidity, including substance use, depression, anxiety, and accidents, all of which can contribute to premature mortality [4].
How are these studies conducted?
The UCL study used a matched cohort design, drawing on prospectively collected primary care data spanning 2000 to 2019. Researchers matched each person with ADHD to 10 people of the same age, sex, and primary care practice who did not have an ADHD diagnosis. They then used Poisson regression to estimate age-specific mortality rates and life tables to model expected lifespan [1].
Barkley's 2019 study took a different approach: a longitudinal follow-up of 131 children originally diagnosed with hyperactive child syndrome, tracked into young adulthood alongside 71 controls. Rather than observed deaths, Barkley used 14 health and lifestyle variables entered into a life expectancy calculator to generate estimated life expectancy scores [3].
Both approaches have strengths and limitations. The UCL study benefits from a very large sample and real mortality data, but it only captured adults who had received a formal ADHD diagnosis, roughly 1 in 9 of the estimated total adult ADHD population. People who seek and receive a diagnosis may differ from those who do not, in ways that could affect health outcomes in either direction. Barkley's study followed individuals from childhood, providing developmental context, but used estimated rather than observed life expectancy.
Population statistics versus individual outcomes
A critical point: these figures describe group averages, not individual predictions. A 7- or 9-year reduction in life expectancy across a population does not mean any specific person with ADHD will die 7 or 9 years earlier. Many adults with ADHD live long, healthy lives. The statistics reflect the combined effect of risk factors that are more common in people with ADHD, many of which are modifiable.
What drives the life expectancy gap?
The UCL researchers found that diagnoses of common physical and mental health conditions were more common in adults with diagnosed ADHD than in the comparison group [1]. The gap is not caused by one single factor. Instead, several overlapping risks accumulate over a lifetime.
| Risk category | How it connects to ADHD | Modifiable? |
|---|---|---|
| Smoking and substance use | Impulsivity and self-medication patterns can increase uptake; quitting may be harder without support | Yes, with treatment and support |
| Physical inactivity | Executive function difficulties can make routine exercise harder to maintain | Yes, with structure and accountability |
| Cardiovascular disease | Higher rates of smoking, obesity, and stress contribute to elevated risk | Yes, through lifestyle changes and medical care |
| Type 2 diabetes | Associated with obesity and irregular eating patterns | Yes, with dietary support and monitoring |
| Accidents and injuries | Inattention and impulsivity increase risk of motor vehicle and other accidents | Partially, with treatment and environmental strategies |
| Untreated mental health conditions | Depression, anxiety, and substance use disorders are more common and may go unaddressed | Yes, with integrated treatment |
The researchers concluded that the life expectancy deficit is "likely caused by modifiable risk factors and unmet support and treatment needs in terms of both ADHD and co-occurring mental and physical health conditions" [1]. Understanding the long-term effects of untreated ADHD in adults helps clarify why these risks accumulate.
How do substance use and accidents contribute?
Substance use and accidental injury are among the most direct pathways linking ADHD to premature mortality. Impulsivity, a core feature of ADHD, can increase the likelihood of risky driving, substance experimentation, and difficulty moderating alcohol or drug use once started. The Franke et al. (2018) review noted that substance use, accidents, and antisocial behaviors are consistently elevated across ADHD lifespan studies [4].
The 2024 Swedish cohort study by Li and colleagues examined this more precisely. Among 148,578 individuals with ADHD, unnatural-cause mortality (which includes unintentional injuries, suicide, and accidental poisonings) was notably higher in those who did not start medication after diagnosis. The two-year unnatural-cause mortality risk was 33.3 per 10,000 in the non-initiation group compared to 25.9 per 10,000 in those who started medication (HR: 0.75; 95% CI: 0.66 to 0.86) [2].
These are not inevitable outcomes. Substance use treatment, driving safety strategies, and ADHD-specific support can reduce these risks. But they do require that ADHD is identified in the first place. If you suspect ADHD may be affecting your daily life, you can take a free ADHD screening as a starting point for a conversation with a clinician.
What role do physical health comorbidities play?
Regular physical activity is one of the most studied protective factors against the cardiovascular risks linked to ADHD.
Adults with ADHD experience higher rates of several chronic physical conditions. The UCL study found that physical health diagnoses were more common across the ADHD group than in matched controls [1]. The AHRQ systematic review protocol (2024) summarizes the broader evidence: ADHD in adults is often associated with co-occurring depression, anxiety, emotional dysregulation, substance use, poor executive functioning, accidents, and impaired quality of life [5].
The connection between ADHD and physical health is not always obvious. Executive function difficulties can make it harder to maintain regular medical appointments, follow through on treatment plans, take medications consistently, or sustain healthy eating and exercise habits. Over years and decades, these small gaps in self-management can compound into serious health consequences.
Learning more about ADHD comorbidities can help you understand which co-occurring conditions to watch for and discuss with your healthcare provider.
Checklist: health conversations to have with your clinician
If you have ADHD (or suspect it), consider raising these topics at your next appointment:
- Cardiovascular screening: Ask whether your blood pressure, cholesterol, and heart health are being monitored regularly, especially if you take stimulant medication.
- Metabolic health: Request screening for type 2 diabetes or prediabetes if you have risk factors such as obesity or a sedentary lifestyle.
- Substance use: Be honest about alcohol, nicotine, or other substance use so your clinician can offer appropriate support.
- Mental health comorbidities: Ask whether depression, anxiety, or sleep problems should be assessed alongside your ADHD.
- Medication adherence: If you struggle to take medications consistently, discuss strategies or formulations that may help.
- Accident prevention: Talk about driving safety, especially if you have had near-misses or citations related to inattention.
Does treatment change outcomes?
Consistent treatment, including medication adherence and structured routines, is associated with reduced accident and health risks over time.
The most direct evidence comes from the 2024 Swedish study by Li and colleagues. Among 148,578 individuals diagnosed with ADHD, those who started medication within three months of diagnosis had a significantly lower two-year all-cause mortality risk compared to those who did not (HR: 0.79; 95% CI: 0.70 to 0.88) [2]. The reduction was driven primarily by lower unnatural-cause mortality (injuries, suicide, accidental poisonings), not by natural-cause mortality, where the difference was not statistically significant.
This is an observational study, not a randomized trial, so it cannot prove that medication directly caused the reduction. People who start medication may differ from those who do not in ways that also affect mortality risk (for example, they may have better access to healthcare or stronger support systems). Still, the association is consistent with what we know about how ADHD medication can reduce impulsivity and improve decision-making in daily life.
Treatment for ADHD extends well beyond medication. The AHRQ protocol notes that adults with ADHD are treated with stimulants, non-stimulant medications, psychological therapies, behavioral interventions, and various psychotherapies [5]. Addressing the co-occurring conditions (depression, anxiety, substance use) that contribute to the mortality gap is equally important.
What the evidence does not yet tell us
No long-term randomized trial has tracked whether ADHD treatment over decades changes life expectancy. The Swedish study followed people for only two years. The UCL study did not examine treatment effects at all. We have strong reasons to believe that managing ADHD and its associated risks should improve long-term outcomes, but the direct evidence linking treatment to lifespan extension is still developing.
How should you interpret these findings?
These statistics can feel alarming. That reaction is understandable. But context matters.
First, the risks identified in this research are largely modifiable. Smoking, physical inactivity, untreated mental health conditions, and lack of ADHD support are all things that can be addressed. The UCL researchers made this point explicitly: they believe the gap is driven by factors that could be changed with better support and treatment [1].
Second, the UCL study only included adults who had been formally diagnosed with ADHD, about 1 in 9 of the estimated total. The researchers noted that their results "may not generalise to the entire population of adults with ADHD, the vast majority of whom are undiagnosed" [1]. It is possible that the diagnosed group had more severe symptoms or more comorbidities than the average person with ADHD.
Third, awareness is itself protective. Knowing that ADHD increases certain health risks puts you in a position to act on them. Regular health screenings, consistent treatment, physical activity, and support for co-occurring conditions are all practical steps.
Decision framework: when to seek assessment
Consider pursuing an ADHD evaluation if:
- You have persistent difficulty with attention, impulsivity, or restlessness that affects work, relationships, or health
- You have been treated for anxiety or depression without full improvement
- You notice patterns of risky behavior, substance use, or difficulty maintaining health routines
- A family member has been diagnosed with ADHD
- You want to understand whether ADHD could be contributing to the challenges you experience
If any of these apply, you can try our online ADHD self-assessment as a first step before speaking with a clinician.
Infographic: key points about adhd life expectancy.
Key statistics on how ADHD affects health outcomes and how treatment shifts the risk profile.
Frequently asked questions
Does ADHD directly shorten your life?
ADHD itself is not a terminal condition. The life expectancy gap identified in research appears to be driven by modifiable risk factors that are more common in people with ADHD, such as smoking, physical inactivity, accidents, and undertreated co-occurring health conditions. Addressing these factors can reduce the associated risks.
How many years of life expectancy does ADHD reduce?
The 2025 UCL study estimated a reduction of about 6.78 years for men and 8.64 years for women with diagnosed ADHD, compared to matched peers without ADHD (O'Nions et al., 2025). These are population averages, not individual predictions.
Does ADHD medication reduce mortality risk?
A 2024 Swedish cohort study found that starting ADHD medication within three months of diagnosis was associated with a 21% lower all-cause mortality risk over two years (Li et al., 2024). The reduction was strongest for unnatural-cause deaths. This was observational, not a randomized trial, so it suggests but does not prove a causal link.
Are women with ADHD at greater risk than men?
The UCL study found a larger life expectancy gap for women (about 8.6 years) than for men (about 6.8 years) [1]. The reasons are not fully understood, but may relate to later diagnosis in women, different patterns of comorbidity, or other factors the study did not measure directly.
What are the biggest health risks for adults with ADHD?
The most consistently identified risks include:
- Smoking and substance use
- Motor vehicle and other accidents
- Cardiovascular disease and type 2 diabetes
- Untreated depression, anxiety, and sleep disorders
- Difficulty maintaining preventive health routines
Can lifestyle changes reduce the life expectancy gap?
The UCL researchers believe so. They concluded that the gap is "likely caused by modifiable risk factors and unmet support and treatment needs" (O'Nions et al., 2025). Regular exercise, smoking cessation, consistent medical care, and treatment for co-occurring conditions are all practical targets.
Does untreated ADHD carry more risk than treated ADHD?
The Swedish medication study found lower mortality in those who started treatment promptly (Li et al., 2024). Barkley's 2019 study found that ADHD persisting into adulthood was associated with a larger estimated life expectancy reduction (12.7 years) than childhood ADHD that did not persist (Barkley, 2019). Both findings suggest that ongoing, untreated ADHD may carry greater risk.
Do these statistics apply to every person with ADHD?
No. Population-level statistics describe averages across large groups. Many adults with ADHD live long, healthy lives. Individual outcomes depend on a wide range of factors, including treatment, lifestyle, co-occurring conditions, and social support.
Should I be worried if I have ADHD?
These findings are worth taking seriously, but they are not a reason to panic. The most productive response is to use the information: stay current with health screenings, address co-occurring conditions, maintain physical activity, and work with a clinician on a treatment plan that fits your life. Awareness of the risks is the first step toward reducing them.
How can I find out if I have ADHD?
A formal diagnosis requires a clinical evaluation. As a starting point, validated screening tools can help you decide whether to pursue assessment. You can explore your symptoms with a free ADHD screening and bring the results to a clinician for further discussion.
