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Mark Phillips played nearly 400 professional football matches. He represented Millwall, Brentford, and Southend. He lifted a League Two trophy and walked out at Wembley. From the outside, his career looked like everything a young footballer could aspire to: grit, resilience, and nearly two decades at the professional level.
What the outside could not see was the inner critic that tore apart every performance, the anxiety around transfers that cost him career opportunities in Scotland and Belgium, the hyperfocus that made preparation feel consuming, and the burnout that followed him even when things appeared to be going well.
At 43 years old, Mark Phillips received a diagnosis that reframed not just his football career but his entire life: ADHD, combined type. And he describes it, without hesitation, as life-changing.
When Mark Phillips retired from professional football, he expected the transition to be difficult. Almost every former professional athlete describes the same thing: the structure, routine, and identity that sport provides disappear overnight, and the adjustment period that follows can be genuinely disorienting.
So when Phillips began struggling after retirement, he attributed it to that. The adrenaline void. The loss of purpose. The normal, well-documented difficulty of life after professional sport.
But things did not add up. Personal challenges compounded the adjustment, including the sudden loss of his father. Counselling helped in the short term but did not reach what felt like the root of the problem. There was something he could not quite name, a pattern of difficulty that counselling addressed around the edges without touching its centre.
"Before my diagnosis, ADHD never crossed my mind," he has said. "I had a stereotypical view of it as hyperactivity in young boys, nothing like what I experienced."
This is one of the most common and most consequential features of how ADHD is understood in public culture. The stereotype, a disruptive, physically hyperactive child, does not map onto the experience of many adults with the condition, particularly men who have spent decades developing compensatory strategies that make their ADHD invisible to everyone, including themselves.
The moment that changed Phillips's understanding came through his family, not through clinical referral or his own research. As his son was being assessed for ADHD, Phillips began recognising familiar patterns. The behaviours and experiences being described in the assessment context were ones he knew from the inside.
Then social media videos about adult ADHD began appearing in his feed. Unlike most health information he had encountered before, this content resonated in a way nothing else had. "The things I was seeing made complete sense." The patterns described, the inner experience, the inconsistency between apparent capability and actual daily functioning, all of it reflected something he had lived with for forty years without having a name for it.
This is a pathway to assessment that is increasingly common. Social media has played a significant role in helping adults with unrecognised ADHD encounter descriptions of the condition that reflect their experience rather than the hyperactive child stereotype. For more on why ADHD awareness has increased without any corresponding increase in ADHD prevalence, see our article on why awareness, not prevalence, is behind the surge in ADHD diagnoses.
Phillips pursued a private assessment. It would prove to be one of the most significant decisions of his adult life.
The formal assessment process included questionnaires, clinical interviews, and one element that surprised Phillips: his old school reports. When he read them, they did not match the upbeat memories he carried of secondary school. Teachers had described unmet potential, inattention, and disruptive behaviour. These were not the records of the student he remembered being.
Seen through the lens of ADHD, they made immediate sense. The inconsistency between intelligence and output. The behaviour that teachers interpreted as choice or attitude but which reflected neurological difficulty with sustained attention and impulse regulation. The potential that was described as unmet not because it was not there but because the conditions to access it were not in place.
The final three-hour clinical session was the one that changed everything.
"I still feel emotional talking about it. When the doctor said, 'You've definitely got ADHD,' I broke down. It was life-changing. It finally explained why I struggled the way I did, and that it wasn't my fault."
This is the moment that many adults with late ADHD diagnoses describe as pivotal, not the clinical confirmation itself but the reframing it produces. The difficulties were not character failings. They were not laziness, inconsistency, or weakness. They were features of a neurological difference that had been present his entire life and had never been identified or supported.
For Phillips, the diagnosis was not a label. It was validation. For more on what the adult ADHD assessment process involves and what it looks for, see our article on the DIVA-5 ADHD assessment.
With the diagnosis in hand, Phillips has been able to look back at his playing career through an accurate lens for the first time. What he sees is ADHD everywhere, in the patterns that made him effective, in the patterns that created difficulty, and in the experiences that cost him opportunities he did not understand at the time.
The picture that emerges is of a player whose ADHD was simultaneously a significant professional asset and an unrecognised source of strain. This is not an unusual pattern, and it has particular relevance to professional sport, where the high-stimulation, high-stakes environment of competitive performance can create conditions in which ADHD traits produce genuine advantages, while the less structured aspects of a professional career, travel, transition, media demands, produce corresponding difficulties.
The feature of his playing days that Phillips now most clearly recognises as ADHD-related is his relationship to preparation and performance.
"I'd hyperfocus on perfecting every little thing," he has said. This kind of intense, detailed, absorbed attention to specific aspects of performance is a recognised feature of ADHD. The same brain that cannot sustain attention on routine or unstimulating tasks can lock on to high-interest or high-stakes activities with extraordinary depth and intensity.
In a professional sports context, this capacity can be a genuine competitive advantage. The player who is thinking about every detail of how the next match will unfold, who is preparing with unusual thoroughness, who is mentally reviewing performances long after others have moved on, often performs better than peers who are more easily satisfied.
But ADHD hyperfocus has a darker dimension that Phillips also describes clearly. Even after standout performances, one small mistake could unravel his entire evaluation of a match. "I'd beat myself up over tiny things. I never allowed myself to recognise my success."
This inner critic is a well-documented feature of ADHD, particularly in people who have spent years compensating for neurological difficulties without understanding them. The perfectionism that drives intense preparation is the same mechanism that makes any deviation from perfection feel catastrophic. Without the understanding that this pattern is ADHD-related rather than an accurate reflection of performance, it becomes an exhausting and self-defeating cycle.
The other dimension of his ADHD that Phillips now reflects on clearly is how it affected his responses to change and uncertainty, particularly the transfers that are a routine part of professional football.
Opportunities to move to clubs in Scotland and Belgium presented themselves during his career. He did not take them. At the time, he did not have a clear explanation for why the uncertainty triggered such deep discomfort. Looking back, he does.
"I didn't like change. Looking back, I'd have loved those experiences, but I just couldn't push myself forward at the time."
Difficulty with change and uncertainty is a recognised feature of ADHD, connected to the executive function difficulties that make managing novel or unpredictable situations more cognitively and emotionally demanding than they are for neurotypical people. When a transfer involves moving to an unknown city, integrating into a new squad, adapting to a new coaching style, and performing well in an unfamiliar context, all simultaneously, the executive function demands are significant.
For Phillips without a diagnosis, without understanding why the uncertainty felt so overwhelming, the most available response was avoidance. With the understanding his diagnosis eventually provided, he can see clearly what those opportunities were and what it would have taken to pursue them.
"These insights aren't excuses," he has said. "They're reflections I wish I had years earlier, both for myself and for players coming through the system today."
After his diagnosis, Phillips began taking ADHD medication. He describes the impact as significant and multidimensional.
Medication helped him access emotions he had previously struggled to reach. It reduced the daily overwhelm and burnout he had been living with without recognising them for what they were. It improved his communication, helped him establish and maintain clearer boundaries, and gave him better access to an understanding of his own cognitive and emotional limits.
"I know I can't do everything. I'm learning to build teams around me instead of juggling everything myself."
This is a common and important outcome of appropriate ADHD treatment in adulthood: not just symptom reduction but a clearer understanding of how one's brain actually works, and the ability to build structures and relationships that work with that understanding rather than against it.
For more on what ADHD medication can and cannot do, and what accessing it after diagnosis involves, see our article on how to get ADHD medication after diagnosis.
Phillips is careful to be clear that he is not diagnosing anyone. But he is direct about what he now observes when he looks at the football world through the lens of his own understanding: signs of unrecognised neurodivergence are visible throughout the game, in impulsive reactions, emotional outbursts, the guilt and regret that often follow, and the patterns of players who seem to perform brilliantly in some conditions and struggle inexplicably in others.
Professional football has characteristics that make it both a likely environment for undiagnosed ADHD to go unrecognised for a long time and a genuinely demanding environment for the dimensions of ADHD that create difficulty. The high stimulation of match day creates optimal conditions for ADHD-related hyperfocus and performance intensity. The rest of the schedule, the routine training sessions, the administrative and media demands, the interpersonal complexity of squad life, creates very different demands.
Phillips wants clubs to create environments where players feel able to seek assessment without stigma. "Imagine if players understood their brains earlier, how much it could help their careers and their wellbeing." He is currently working with player associations and hopes to help clubs build awareness and support pathways.
The most concrete outcome of Phillips's diagnosis has been the creation of The ND Footballer, a platform dedicated to ADHD and neurodiversity in sport. Through videos, resources, workshops, and outreach, the platform aims to help young athletes and their families understand neurodivergence earlier and more accurately than he did.
He speaks to schools, organisations, and businesses, and is actively seeking to expand into football academies and clubs. His mission is direct: help people understand their brains sooner than he did. "Our differences need to be celebrated. ADHD can be tough, really tough, but it can also be a strength when you finally understand it."
This kind of advocacy from within a professional sporting community carries a credibility and specificity that general ADHD awareness campaigns cannot fully replicate. Phillips is speaking directly to the people, young footballers, academy players, coaches, and clubs, who are most likely to be dealing with unrecognised ADHD in exactly the contexts where his experience is most relevant.
Mark Phillips's story belongs to a pattern that is increasingly well-documented: the adult who has been living with ADHD throughout their entire life without knowing it, whose difficulties have been attributed to personality, attitude, or choice rather than neurology, and who finally receives a diagnosis that changes how they understand everything that came before.
His story is notable for several specific reasons. He is a professional athlete, which challenges the assumption that ADHD is incompatible with high performance. He is a man in his forties, which challenges the assumption that ADHD is primarily a childhood condition. And he received his diagnosis through a pathway that began with his son's assessment and was confirmed by social media content that resonated with his experience, which reflects a real and growing pattern of how adult ADHD recognition is happening in 2024 and 2025.
For more on how ADHD presents in adult life and why it so frequently goes unrecognised, see our article on signs of ADHD in adults.
The features of Phillips's story that are most clinically significant are also the most commonly encountered in adults who receive late diagnoses. The self-critical inner voice that turned every minor mistake into evidence of failure. The difficulty with change and transition that created avoidance rather than the awareness that avoidance was happening. The burnout that accumulated without being recognised as burnout. The counselling that helped without reaching the underlying cause.
What changes with an accurate diagnosis is not that these experiences disappear. It is that they become understandable rather than shameful. And that shift, from a moral framework in which difficulties reflect inadequacy to a neurological framework in which they reflect how a specific brain works, is one of the most consistently reported and most meaningful outcomes of late ADHD diagnosis in adults.
For healthcare professionals who want to develop their clinical expertise in recognising and assessing ADHD in adults, including the presentations that most commonly go unrecognised, our ADHD assessor training course and ADHD training for professionals provide CPD-certified education grounded in current international evidence.
If you are a former athlete who recognises patterns in Phillips's account, the most useful next step is not self-diagnosis but documentation. Note specific examples of how the experiences he describes have shown up in your own career and daily life, and bring that to a GP or primary care provider with a specific request for assessment.
If you work in professional sport, Phillips's call for clubs and academies to create stigma-free environments for neurodivergence assessment is worth taking seriously. The data on ADHD prevalence suggests it is significantly present in professional sporting populations, and the current absence of structured support for identification and management represents a meaningful gap.
If you are a young athlete or a parent of one who recognises the patterns Phillips describes, earlier identification is consistently associated with better outcomes. ADHD assessment is available from four years of age, and the evidence strongly supports identifying and supporting ADHD earlier rather than later.
If you are an adult who has had similar experiences of late recognition, the DIVA-5 assessment process that many UK clinicians now use is specifically designed to explore ADHD symptoms across the full lifespan, including childhood experiences that were never understood as ADHD at the time.
Has Mark Phillips been formally diagnosed with ADHD?Yes. Phillips has publicly stated that he received a formal ADHD combined type diagnosis at the age of 43, following a private assessment that included questionnaires, clinical interviews, and review of his school reports.
What is ADHD combined type?ADHD combined type means that a person has significant symptoms in both the inattentive domain, including difficulties with focus, organisation, and working memory, and the hyperactive-impulsive domain, including restlessness, impulsivity, and difficulty regulating activity levels. It is the most commonly diagnosed presentation of ADHD overall.
Is ADHD common in professional athletes?There is no definitive epidemiological data specific to professional footballers, but ADHD affects approximately 3 to 5 percent of adults in the general population, and there is no clinical reason to expect professional athletes to be an exception. Some researchers have suggested that the high-stimulation, high-stakes environment of competitive sport may make ADHD traits less disruptive in certain contexts while creating specific difficulties in others.
Can hyperfocus in ADHD be a professional advantage?For some people in some contexts, yes. The capacity for intense, sustained absorption in high-interest activities can produce exceptional performance in environments that align with how the ADHD brain works. The challenge is that the same brain that hyperfocuses on a match often struggles with the routine, administrative, and transitional aspects of professional life. Understanding both dimensions is more useful than presenting hyperfocus as simply a gift.
What is The ND Footballer?The ND Footballer is a platform created by Mark Phillips to provide ADHD and neurodiversity resources, workshops, and outreach specifically for athletes, young footballers, academies, and sporting organisations. His mission is to help people understand their brains earlier than he did, and to build awareness and support within sport.
Mark Phillips played professional football for nearly two decades without knowing that ADHD was shaping every significant experience along the way: the hyperfocus that made him exceptional in preparation, the inner critic that would not let him rest after good performances, the anxiety around transfers that cost him experiences he would have valued, and the unnamed exhaustion that followed him into retirement.
He has the language for it now. And he is using it, not quietly or privately, but through public advocacy, structured outreach, and a platform specifically designed to ensure that the young athletes who follow him into professional sport have access to that understanding years earlier than he did.
His story is part of a broader and important conversation about ADHD in adulthood, in professional sport, and in the lives of men who have spent decades managing a condition they could not name. The diagnosis at 43 did not undo the past. But it changed his relationship to it, permanently and profoundly.
Medical Disclaimer
This article discusses a public figure's publicly stated experiences with ADHD for educational and awareness purposes. It does not constitute medical advice. If you have concerns about ADHD in yourself or someone you know, please speak with a qualified healthcare professional.
