Diagnostic Overshadowing: The Hidden Barrier to Understanding People with Learning Disabilities

There is a moment that happens quietly and more often than most people realise. A person with a learning disability becomes distressed, withdrawn, tearful, or begins to act in ways that others find challenging. It might be a child refusing to join an activity, a young person shouting or hitting out, or an adult suddenly becoming uncharacteristically quiet. In that moment, those around them often reach for an explanation that feels safe and familiar.

“It is just their autism.” 

“It is because of the learning disability.” 

“That is what they do.”

These statements are rarely said with bad intent. They are attempts to create meaning in a confusing situation, to make sense of behaviour that feels unpredictable or uncomfortable. Yet the comfort they bring to adults comes at a cost to the person being described. When everything is explained by diagnosis, the individual themselves disappears behind it. Their feelings, experiences, and needs become invisible.

This is diagnostic overshadowing.

It is the process by which signs of distress, discomfort, or illness are incorrectly attributed to a person’s diagnosis rather than investigated as potential indicators of something else. It can happen in a classroom, in a clinic, in a care home, or in an emergency department. It can happen to young children, teenagers, or adults. It happens most often to people who have minimal or no spoken language, because their communication depends on others being able to interpret behaviour, body language, and subtle shifts in expression. When diagnostic overshadowing takes hold, that interpretation stops. The message is missed.

Diagnostic overshadowing is not driven by cruelty or apathy. It is driven by human fallibility, by systems that leave little time for curiosity, and by a desire to impose order on complexity. Yet the consequences are serious. It can mean the difference between being supported and being dismissed, between recovery and deterioration, between dignity and harm.

When Diagnosis Becomes the Whole Story

A diagnosis can be immensely helpful. It can open doors to support, increase understanding, and provide shared language for families and professionals. But it is only useful when it remains context, not conclusion. When the diagnosis becomes the sole explanation for every behaviour or symptom, the person stops being seen as an individual.

I have seen this pattern many times. A young child who becomes upset during playtime is described as “just overstimulated,” when in fact they are hungry and unable to express it. A teenager who refuses to join lessons is told they are “non-compliant,” when the truth is that the environment is too unpredictable and frightening. An adult who becomes aggressive during personal care is labelled “challenging,” when no one has checked for infection, toothache, or sensory pain.

Each of these situations begins with an assumption, and that assumption prevents understanding.

Of course, some behaviours are associated with neurological differences. But association is not explanation. Even when a behaviour relates to a diagnosis, it still communicates something about the person’s current experience. Dismissing enquiry because something is common is not clinical efficiency; it is complacency.

Diagnostic overshadowing convinces professionals that they already know why something is happening. It short-circuits enquiry. Instead of asking, “What is this behaviour communicating?” they settle for, “It is part of their condition.” That shift from curiosity to certainty is subtle but powerful. It changes how people are supported and whether they are believed. It changes the level of care they receive and the respect with which they are treated.

For individuals who cannot rely on spoken language, the effect is magnified. When behaviour is the primary form of expression, pushing away, biting, screaming, freezing, or self-injury may all be attempts to communicate discomfort, confusion, pain, or fear. When these acts are dismissed as symptoms rather than signals, the person’s language is effectively erased.

Behaviour as Communication

Every behaviour communicates something about a person’s experience of the world. It tells us how they are coping, what they are feeling, what they want to avoid, and what they are seeking.

Understanding behaviour as communication requires skill and empathy. It asks us to consider context, environment, patterns, and change.

A person who hits out during transitions might be expressing fear of unpredictability rather than aggression. Someone who screams during bathing may be communicating sensory overload rather than resistance. A person who becomes withdrawn might be trying to escape pain, discomfort, or emotional exhaustion.

These behaviours are not random. They make sense when viewed through the right lens.

Recognising behaviour as communication is not simply a technique. It is an ethical stance.

It acknowledges that every person, regardless of their communication style, deserves to be heard. It moves us away from control and towards understanding. It reminds us that behaviour is information, not inconvenience.

The Evidence We Cannot Ignore

The risks of diagnostic overshadowing are not theoretical. National reviews have repeatedly shown that people with learning disabilities die younger than the general population, often from treatable conditions.

The NHS England Learning from Lives and Deaths (LeDeR) programme has consistently identified diagnostic overshadowing as a recurring factor in preventable deaths. The earlier Confidential Inquiry into Premature Deaths of People with Learning Disabilities (CIPOLD) found similar patterns: symptoms of serious illness were too often attributed to an existing disability rather than properly investigated.

Campaigning work by Mencap, including the Death by Indifference report, highlighted systemic failures within healthcare where concerns were minimised or ignored.

These are not isolated cases. They are patterns.

When behaviours or symptoms are misinterpreted as part of a diagnosis, medical problems go untreated. A person in pain may be described as “having a behavioural outburst.” Someone experiencing anxiety or depression may be labelled “just withdrawn.” A person with physical illness may be assumed to be “having a bad day.”

The consequences can include delayed treatment, unnecessary restraint, exclusion from education, avoidable hospital admissions, and in some cases, preventable death.

There is also an emotional cost. People who are repeatedly misunderstood learn that their communication does not work. Families who raise concerns may begin to doubt their instincts when they are told, again and again, that “this is just how your child is.” The silence that follows is not peace; it is resignation.

Diagnostic Overshadowing and Intersectional Risk

Diagnostic overshadowing does not occur in isolation. It intersects with race, gender, poverty, communication differences, and service inequality.

A non-speaking autistic adult from a marginalised community may face multiple layers of disbelief. A woman with a learning disability reporting pain may be taken less seriously. A person living in institutional settings may have fewer advocates to challenge assumptions.

When bias compounds, the risk of being unheard multiplies.

Overshadowing is not only about diagnosis. It is about power, whose voice is considered credible, and whose distress is treated as legitimate.

The Life-Course Perspective

Diagnostic overshadowing changes shape across the lifespan.

In early childhood, developmental differences can mask medical symptoms. Feeding difficulties, disturbed sleep, or irritability may be interpreted as “features” of a diagnosis rather than signs of discomfort.

During school years, distress may be reframed as defiance or manipulation. The focus shifts to compliance rather than understanding, increasing the risk of exclusion or punishment.

In adulthood, a sudden refusal to eat might signal oral pain. Withdrawal may indicate depression or early dementia. Yet staff may be told to “monitor” rather than escalate, because the behaviour aligns with the label rather than the person.

In older age, hearing loss, arthritis, or other health changes may be misattributed to existing disability, leading to untreated pain and reduced independence.

Across every stage of life, the pattern is the same: the diagnosis overshadows the individual.

The Story of Oliver McGowan

In England, any discussion of diagnostic overshadowing inevitably brings us to the story of Oliver McGowan. His case has become central to conversations about safety, communication, and the responsibility professionals hold when supporting people with learning disabilities and autism.

Oliver was 18 years old. He was autistic, had epilepsy, cerebral palsy and a mild learning disability. He was known by his family as someone who was clear about his needs and able to communicate what had and had not worked for him in the past. In November 2016, Oliver was admitted to Southmead Hospital in Bristol following a seizure.

During his admission, antipsychotic medication was administered. Oliver and his family had previously raised concerns about adverse reactions to such medication. Despite this history, the medication was given. Oliver developed Neuroleptic Malignant Syndrome, a rare but serious reaction associated with antipsychotic drugs. He suffered further complications and died on 11 November 2016.

Subsequent reviews identified a number of failings in his care. These included issues relating to communication, recognition of reasonable adjustments, documentation, and the way clinical decisions were made in the context of his diagnoses. The independent review and inquest findings did not reduce the situation to a single decision. Instead, they described a series of missed opportunities to fully integrate the knowledge held by Oliver and his family into his care planning.

What makes Oliver’s case so relevant to discussions of diagnostic overshadowing is not only the outcome, but the pattern it illustrates. Diagnostic overshadowing occurs when a person’s behaviour, distress, or presentation is interpreted primarily through the lens of an existing diagnosis, rather than prompting open clinical enquiry. In Oliver’s case, questions were later raised about how his distress and clinical presentation were understood, and whether sufficient weight was given to his previous reactions and his family’s expertise.

It would be overly simplistic to frame what happened as one professional failing to listen. The reality described in the reviews was more complex. It involved communication breakdowns, gaps in understanding around autism and learning disability, and systemic weaknesses in recognising how neurological difference may affect presentation and risk. This complexity matters, because diagnostic overshadowing rarely occurs as a dramatic or deliberate act. It often emerges quietly within systems that are not fully equipped to adapt to difference.

Following Oliver’s death, his parents, Paula and Tom McGowan, campaigned for mandatory training for health and social care professionals in learning disability and autism. Their advocacy led to the development of the Oliver McGowan Mandatory Training on Learning Disability and Autism, introduced as a statutory requirement under the Health and Care Act 2022.

The purpose of this training is to strengthen professional competence in recognising communication differences, making reasonable adjustments, understanding baseline presentation, and working collaboratively with families and carers. It acknowledges that misunderstanding can have profound consequences, and that diagnostic labels must never replace individualised assessment.

Oliver’s legacy is therefore not only about loss. It is about structural change. His name now represents a commitment to learning and accountability within health and social care systems. It is a reminder that behind every diagnosis is a person with a history, preferences, vulnerabilities, and expertise about their own body. It reinforces that listening is not optional, and that safeguarding begins with taking people and families seriously.

When we talk about diagnostic overshadowing, we are not discussing an abstract concept. We are discussing the real world implications of how professionals interpret information. Oliver’s story continues to shape that conversation, and it asks something steady and important of us. To hold diagnosis as context, not conclusion, and to ensure that communication from the individual and from their family is treated as clinical evidence, not background detail.

A Reflective Framework for Practice

Preventing diagnostic overshadowing requires more than awareness. It requires deliberate reflection.

Before attributing behaviour to diagnosis, pause and ask:

• What has changed recently?

• What would I think if this person did not have a diagnosis?

• Have I ruled out pain, illness, medication effects, or environmental stress?

• Is this behaviour new, escalating, or out of character?

• Have I asked family or carers what is typical?

• Am I reacting to inconvenience, or investigating communication?

  
  

These questions are not bureaucratic exercises. They are safeguards against complacency.

Organisational Culture and System Pressures

Diagnostic overshadowing does not persist because individual professionals are indifferent. It persists because of the environments in which they work.

Health, education, and social care systems are under sustained pressure. Appointments are short. Caseloads are heavy. Staffing shortages are common. Documentation demands grow while time for reflection shrinks. In such conditions, certainty can feel efficient. Curiosity can feel like a luxury.

When a professional is seeing ten patients in a morning clinic, or managing a classroom with limited support, there is powerful pressure to make quick sense of behaviour. A known diagnosis offers an immediate explanation. It reduces ambiguity. It feels tidy. But tidy explanations can conceal untidy realities.

Organisational cultures also shape how questioning is received. In some settings, raising concerns about medical causes may be encouraged. In others, it may be subtly discouraged if it creates additional work, referrals, or perceived risk. Staff may be told to “monitor” rather than escalate. Families may be reassured rather than heard.

Diagnostic overshadowing thrives where reflection is squeezed out by urgency. It thrives in cultures where compliance is prioritised over understanding, and where throughput is measured more visibly than quality of listening.

Preventing overshadowing therefore requires more than individual awareness. It requires leadership that protects time for supervision and multidisciplinary discussion. It requires systems that tolerate uncertainty rather than rushing to resolution. It requires organisations that see thoughtful enquiry not as inefficiency, but as safety.

The Language We Use Matters

Language does not simply describe behaviour. It frames it.

When distress is labelled “challenging behaviour,” attention often shifts to managing the challenge rather than understanding the distress. When a child is described as “non-compliant,” the focus moves to obedience instead of environment. When behaviour is framed as “attention-seeking,” investigation frequently stops altogether.

These phrases are common in professional discourse. They are rarely used with malice. Yet they shape thinking in powerful ways. Words influence where responsibility is placed. If behaviour is described as “manipulative,” the responsibility sits with the individual. If it is described as “communication,” responsibility becomes shared.

Even the term “behavioural” can subtly imply that the issue is within the person rather than potentially rooted in pain, anxiety, sensory overload, or unmet need. Language can either open enquiry or close it.

Shifting language does not mean avoiding clarity. It means choosing words that preserve curiosity. Instead of “challenging behaviour,” we might describe “behaviour that challenges the service.” Instead of “non-compliant,” we might ask, “What is preventing participation?” Instead of “attention-seeking,” we might consider, “What need is being expressed?”

When we change language, we change perception. And when perception shifts, so too does practice.

Seeing the Person, Not the Label

At its core, diagnostic overshadowing is a failure of seeing. It happens when familiarity replaces attentiveness. When speed replaces reflection. When labels replace listening.

Reversing it begins with a shift in stance.

When professionals assume that behaviour is communication, the dynamic changes. The person becomes an active participant in their own support. Behaviour is not something to suppress but something to understand. Pain is recognised earlier. Anxiety is reduced. Relationships strengthen.

For people with learning disabilities, especially those who rely on behaviour to communicate, this shift can be transformative. Their distress leads to support rather than punishment. Their identity is not defined solely by diagnosis but shaped by individuality.

Restoring Curiosity and Dignity

Diagnostic overshadowing thrives where certainty replaces curiosity and efficiency replaces empathy. Challenging it requires us to slow down.

When you encounter behaviour that puzzles or frustrates you, pause before you explain it away. Ask what else might be happening. Could this be pain? Fear? Grief? Change? Communication?

Sometimes the difference between harm and help is a single question asked at the right time.

Seeing beyond the label is not an academic exercise. It is a moral one. When we choose to see the person, not the diagnosis, we restore dignity to people who have too often been defined by assumptions. And in doing so, we build systems that are not only more accurate, but more humane.