Defence Mechanisms and Undiagnosed ADHD: What I’ve Noticed Working With Adults
Dr Laura Wade
Over the last few years working as a psychologist and therapist with adults with ADHD, I’ve become increasingly interested in the role that psychological defense mechanisms play in how many people cope before diagnosis — and sometimes long after it.
Many adults with undiagnosed ADHD grow up repeatedly experiencing criticism, misunderstanding, shame, emotional overwhelm, inconsistency, social rejection, academic difficulties, or the feeling that they are somehow “failing” at things other people seem able to do naturally. Over time, the mind develops ways to protect itself from these painful experiences.
These defenses are not signs of weakness or manipulation. They are often intelligent psychological survival strategies that once served a purpose. The difficulty is that, over time, they can become rigid patterns that create further emotional suffering, relationship difficulties, avoidance, burnout, or self-esteem problems.
This article explores some of the defense mechanisms I commonly notice in adults with ADHD in clinical work. These are observations and reflections rather than absolute rules, and not every person with ADHD will relate to all of them.
The original definitions of defense mechanisms are drawn from psychodynamic theory and summarized in the NCBI overview of defense mechanisms.
Acting Out
Acting out involves expressing emotional distress through behaviour rather than reflection or communication.
In ADHD, this can begin very early.
A teenager who constantly loses focus in class may already feel ashamed, frustrated, and different from peers. They may become bored quickly, struggle to sustain attention, and begin falling behind despite trying hard. Over time, school can start to feel emotionally painful and humiliating.
Eventually, the young person skips the rest of the school day.
Afterwards they feel guilt, anger, and shame about their own behaviour, but when parents question them at home, the interaction quickly becomes confrontational. The teenager feels misunderstood and overwhelmed, and explodes in anger.
The emotional pain is expressed behaviourally rather than verbally.
Unfortunately, this can reinforce a negative cycle:
avoidance of school
conflict at home
increased shame
worsening self-image
more oppositional behaviour
Over time, what began as overwhelm and emotional dysregulation may start to resemble “antisocial” behaviour to others, even though the underlying experience is often one of distress, failure, and emotional exhaustion.
In adults with ADHD, acting out can sometimes appear as:
impulsive quitting of jobs
angry relationship outbursts
reckless spending
substance misuse
sudden withdrawal from responsibilities
risk-taking behaviour during emotional overwhelm
Often the behaviour makes sense when understood in the context of chronic frustration, rejection sensitivity, and years of feeling emotionally flooded.
Avoidance
Avoidance is one of the most common patterns I see in adults with ADHD.
People with ADHD naturally struggle more with tasks that feel under-stimulating, repetitive, overly structured, or emotionally unrewarding. But avoidance in ADHD often goes much deeper than procrastination.
Many adults begin avoiding tasks or situations they previously could manage because repeated negative experiences have damaged confidence.
The person may think:
“I won’t know where to start.”
“I’ll mess it up.”
“It’ll become overwhelming.”
“I’ll disappoint people again.”
As responsibilities build up, the task begins to feel psychologically enormous. Anxiety increases. Avoidance increases. Then the growing consequences create even more anxiety.
The problem becomes:
avoidance → anxiety → overwhelm → more avoidance
I also commonly notice fear generalisation.
A person may initially avoid one emotionally difficult stimulus:
a particular bus route after a panic attack
opening letters after debt problems
checking emails after criticism at work
But over time the avoidance spreads.
You start by avoiding the number 32 bus.
Eventually you avoid all public transport.
What once functioned as a protective coping strategy becomes restrictive and life-limiting.
Many adults with ADHD also experience co-occurring anxiety disorders, depression, trauma symptoms, or burnout, which can intensify this pattern significantly.
Conversion
Some adults with ADHD appear to carry enormous amounts of unprocessed emotional distress in the body.
Conversion defenses occur when psychological pain becomes expressed physically.
This does not mean symptoms are “made up.” The distress is very real.
I have worked with adults with ADHD who experience:
chronic headaches
muscle pain
gastrointestinal difficulties
fatigue
tension
dizziness
unexplained physical exhaustion
particularly during periods of emotional overload, masking, burnout, interpersonal conflict, or chronic self-criticism.
Many adults with ADHD spend years suppressing frustration, shame, grief, anger, or feelings of inadequacy because they fear burdening others or being judged. Eventually the body begins expressing what the person psychologically struggles to articulate.
The nervous system effectively says:
“Something is wrong.”
even when the individual cannot fully access or verbalise the emotional experience underneath it.
Denial
Denial in ADHD is often more subtle than people imagine.
Some adults strongly resist acknowledging the extent to which ADHD affects their lives.
Others prefer to focus only on the positive aspects:
creativity
spontaneity
energy
hyperfocus
while avoiding discussion of:
emotional dysregulation
impulsivity
unfinished tasks
relationship strain
financial difficulties
shame
exhaustion
This can provide temporary emotional relief.
But over time, denying difficulties often prevents meaningful support, adaptation, self-understanding, or healing.
I also notice denial appearing in statements such as:
“Everyone struggles like this.”
“I’m just lazy.”
“I don’t need help.”
“I work better under pressure.”
“I could sort my life out if I really wanted to.”
Sometimes denial protects the person from confronting years of grief about missed opportunities, misunderstanding, or chronic self-esteem damage.
Identification (Introjection)
Identification involves unconsciously adopting the traits, behaviours, or attitudes of others.
Adults with ADHD may identify strongly with people they admire, envy, or feel intimidated by.
For example:
someone with ADHD may begin copying the routines, productivity systems, or behaviours of a hyper-organised influencer, colleague, or friend in the hope that adopting those behaviours will transform them internally.
Sometimes this helps temporarily.
But if the copied behaviours are unrealistic, perfectionistic, or unsustainable, the person may eventually feel:
shame
inadequacy
envy
failure
all over again.
I also sometimes notice identification occurring in more painful ways.
If someone grows up with highly critical, emotionally dysregulated, or aggressive caregivers, they may unconsciously internalise those same relational patterns.
Without fully realising it, the adult with ADHD may later:
speak harshly to themselves
become overly critical of others
repeat emotionally aggressive communication styles
recreate familiar traumatic dynamics in relationships
Often the person feels trapped in a cycle they consciously dislike but emotionally recognise as familiar.
Projection
Projection can emerge when difficult emotions become too painful to acknowledge internally.
An adult with ADHD who feels deeply inadequate or ashamed may unconsciously assume others are constantly judging or criticising them.
For example:
feeling internally disorganised but accusing others of being controlling
feeling unreliable but becoming suspicious that others cannot be trusted
feeling anger toward authority figures while insisting everyone else is hostile
Sometimes projection protects self-esteem by moving painful feelings “outside” the self.
This can be especially powerful in people with longstanding rejection sensitivity.
Rationalisation
Many adults with ADHD develop sophisticated explanations for difficulties that are actually rooted in overwhelm, fear, shame, or emotional exhaustion.
Examples include:
“I only work well last minute.”
“I’m better when things are chaotic.”
“I didn’t really want that opportunity anyway.”
“People are too demanding.”
“Structure kills creativity.”
More recently, I have also noticed people rationalising certain difficulties entirely through neurobiological explanations:
“I can’t do this because I’m dopamine seeking.”
“My brain just isn’t built for this.”
“My neurobiology is not cut out for normal life.”
Sometimes there is truth within these statements. ADHD absolutely involves differences in attention, reward processing, motivation, and executive functioning.
But there also seems to be a growing tendency culturally to treat biological or neurological explanations as completely factual and indisputable, almost as if they are final verdicts on human possibility.
From my own background in neuropsychology, I do not think the science is always as clear-cut as people would like to believe. Neuroscience is valuable, but it is also evolving, interpretive, and often far more complex than simplified social media explanations suggest.
Sometimes biological explanations reduce shame.
Sometimes they also reduce agency.
A person can unconsciously move from:
“This is something I struggle with.”
to:
“This is what I fundamentally am.”
And that can become psychologically limiting in its own way.
Intellectualisation
Some adults with ADHD become extremely analytical about their difficulties while remaining emotionally disconnected from them.
They may:
endlessly research ADHD
consume psychology content constantly
overanalyse their behaviour
understand every theory intellectually
while still struggling to emotionally process grief, shame, anger, loneliness, or trauma.
Knowledge can become safer than feeling.
I often notice highly intelligent adults immediately moving into problem-solving mode as their first response to emotional pain:
finding systems
researching solutions
creating plans
analysing causes
optimising routines
rather than first validating, tolerating, or even fully noticing what they feel emotionally.
This can look very functional externally. In fact, many people are praised for it.
But feelings that are ignored for too long rarely disappear quietly. They tend to accumulate pressure internally and eventually leak out elsewhere:
irritability
emotional outbursts
exhaustion
resentment
anxiety
compulsive behaviours
sudden burnout
Sometimes the mind keeps thinking because thinking feels safer than feeling.
Humour is often one of the healthiest and most adaptive defences I see in ADHD.
Many adults with ADHD become exceptionally funny, quick-witted, observant, or self-deprecating. Humor can:
reduce shame
create social connection
regulate distress
make painful experiences feel survivable
And honestly, after years working in healthcare and the NHS, I know very well how important dark humor can be. Sometimes laughter is not avoidance at all — it is solidarity. It is how people survive difficult systems, grief, pressure, trauma, and emotional absurdity.
But humor cannot become the only coping mechanism.
Sometimes people joke constantly around experiences that actually wounded them deeply. The room laughs, the tension disappears briefly, but the underlying feeling remains untouched.
If darker emotions such as grief, fear, shame, anger, envy, or loneliness are never expressed directly, humor itself can eventually become another form of avoidance.
The joke gets told.
The feeling stays trapped underneath it.
Sublimation
Sublimation is often considered one of the more adaptive defense mechanisms.
Many adults with ADHD channel emotional intensity into:
creativity
entrepreneurship
helping professions
sport
art
activism
achievement
caretaking roles
What initially feels chaotic internally can become transformed into meaningful work, connection, or purpose.
Some of the most driven and compassionate people I have worked with developed those strengths partly because they spent years learning how to survive emotional intensity.
However, even sublimation has a potential downside.
Sometimes productivity, helping others, creativity, or achievement become socially acceptable ways of avoiding direct emotional expression.
The person learns:
“I can turn pain into usefulness.”
which is admirable in many ways — but it can also create distance from their own needs, vulnerabilities, desires, or unresolved feelings.
Sublimation is often rewarded socially because it looks constructive. But not every feeling can or should be transformed into productivity.
Sometimes it is psychologically healthier to admit:
“I feel hurt.”
“I feel ashamed.”
“I feel envious.”
“I feel angry.”
“I wanted something I didn’t get.”
even when those emotions feel morally uncomfortable or socially undesirable.
Being psychologically healthy does not mean never having dark or imperfect feelings.
It means becoming more able to acknowledge them without being consumed by them.
Summary
Defense mechanisms are not “bad.” They are psychological adaptations.
Many adults with undiagnosed ADHD developed these patterns long before they had language for what they were experiencing. In many cases, the defenses originally protected self-esteem, emotional safety, or social belonging.
The problem occurs when survival strategies become fixed identities.
One of the most powerful parts of ADHD assessment and therapy is helping people understand:
why they developed certain coping patterns
what those patterns once protected them from
and whether those defenses are still serving them now
Often, beneath years of avoidance, anger, perfectionism, masking, humor, intellectualisation, or denial is someone who spent much of their life feeling overwhelmed, misunderstood, or fundamentally “wrong.”
Understanding the defense is often the first step toward developing compassion for the person underneath it.