When ADHD Is Mistaken for Treatment Resistance

Before concluding that a client is treatment-resistant, it's worth asking whether the treatment was designed for their actual brain.

What treatment resistance usually means.

The clinical label of 'treatment-resistant' is applied when a client has received an adequate course of evidence-based treatment and hasn't responded as expected. It's a clinically meaningful category. It's also sometimes applied too quickly before the full picture has been assessed, before treatment delivery has been examined for fit, and before co-occurring conditions have been considered.

Undiagnosed ADHD is one of the most common factors that masquerades as treatment resistance in adults. It shows up in ERP cases, in eating disorder treatment, in CBT for anxiety, and in general therapy for depression. The treatment approach was appropriate for the primary diagnosis. It wasn't designed for the ADHD underneath.

How ADHD creates apparent non-response in ERP.

ERP requires consistent between-session practice. It requires the ability to register an obsessional trigger, recall the hierarchy, engage the exposure deliberately, and tolerate the discomfort without performing the compulsion. Each of those steps involves executive function: working memory, initiation, attentional hold, and emotional regulation.

ADHD compromises all of them. A client who understands the ERP model intellectually, agrees with it, intends to practice, and consistently doesn't despite genuine motivation is not necessarily resistant to ERP. They may be someone for whom ERP as typically delivered doesn't accommodate how their brain works. The exposures need shorter windows. The practice plans need external structure. The between-session check-ins need to be more frequent. The emotional dysregulation component of ADHD needs its own address.

When ERP is delivered without these adjustments to clients with ADHD, the outcome often looks like poor motivation or low compliance. The actual variable is fit.

How ADHD creates apparent non-response in eating disorder treatment.

Eating disorder treatment commonly involves meal planning, structured eating schedules, monitoring, and between-session behavioral tasks. ADHD makes all of these harder not through resistance or ambivalence, but through the specific deficits in planning, time perception, and task initiation that define the condition.

A client who repeatedly misses meals on the structured plan, forgets monitoring, or doesn't complete between-session work may be working against a real planning deficit, not against the treatment. When this pattern is attributed to ambivalence or eating disorder behaviors rather than ADHD, the clinical response is often to increase motivation work which doesn't address the actual problem.

Additionally, ADHD produces significant emotional dysregulation, including rejection sensitive dysphoria and intense shame responses. When these activate in the context of eating disorder treatment around a missed meal, a deviation from the plan, a difficult session they can produce avoidance that looks like eating disorder-driven resistance. ADHD shame and eating disorder shame are not the same clinical target.

Signs that ADHD may be the missing variable.

• The client understands the treatment model well and cannot reliably execute it outside session.

• The client is highly engaged in sessions and shows significantly less progress than session quality would predict.

• Between-session practice consistently doesn't happen despite stated intention and problem-solving in session.

• The client's functioning varies dramatically with external structure better during periods with more scaffolding, worse during transitions or open-ended time.

• There is a long history of starting things and not completing them, across multiple domains.

• Emotional responses in session are intense and rapid, and the client appears to have limited access to the regulated state between activations.

• A late diagnosis of ADHD or no assessment for ADHD despite a clinical picture that suggests it.

What to do when ADHD is suspected.

The most direct path is assessment. Many adults with ADHD have never been evaluated, particularly women and adults whose ADHD was high-masking in childhood. A formal assessment or referral for one gives you a clinical picture to work with.

In the meantime, treatment modifications that are consistent with ADHD regardless of formal diagnosis include: shorter task windows, external accountability structures, explicit planning for the transition between session and home practice, emotion regulation support woven into the primary treatment, and reduction in the quantity of between-session tasks in favor of specificity and achievability.

Medication evaluation, if not already underway, is worth raising. Effective stimulant management doesn't solve everything, but it can meaningfully reduce the executive function barriers that are blocking treatment from working.