ADHD and Depression in Adults: Overlap, Differences and Order of Treatment

An adult who cannot concentrate, cannot get started on tasks and feels like a failure could have ADHD, depression or both. The two are different conditions with different treatments, and mistaking one for the other is a common reason treatment disappoints. This page explains how they overlap, how they are distinguished and how clinicians think about what to treat first.

How often they occur together

The most cited US figures come from the National Comorbidity Survey Replication, published in 2006. Among adults with ADHD, in the previous 12 months:

• about 38% had some mood disorder;
• about 19% had major depressive disorder;
• about 13% had dysthymia, a milder and longer-lasting form of depression.

These figures should be read as approximate. They rest on a small group of adults with ADHD aged 18 to 44, they have wide margins of error, and they use the diagnostic definitions of the time. A figure often repeated online, that 80% of adults with ADHD have another mental health condition, has no source that could be verified for this guide.

The overlap runs both ways. The National Institute of Mental Health (NIMH) notes that ADHD often co-occurs with other mental disorders and can make them harder to treat.

Where the symptoms overlap

NIMH's list of depression symptoms includes several that also describe ADHD:

• difficulty concentrating, remembering or making decisions;
• restlessness and irritability;
• greater impulsivity;
• difficulty sleeping;
• inability to meet responsibilities.

This is why the CDC lists depression among conditions that can produce symptoms similar to ADHD, and why a symptom checklist filled out during a depressive episode can point toward ADHD when the cause is mood.

How clinicians tell them apart

The rows on onset, course and core features come from the published criteria as summarized by NIMH. In practice the clinician builds a timeline. Was the difficulty with focus and follow-through there in grade school, in high school, in the first job, during periods when mood was good? Or did it arrive with a stretch of low mood and lift when the mood lifted?

NIMH describes providers ruling out alternative diagnoses by reviewing mood and medical history. For depression specifically, NIMH notes that some medications and medical conditions, thyroid disorders among them, can cause similar symptoms, so a physical exam and lab tests may be part of the workup.

Three outcomes are possible: depression alone, ADHD alone, or both. "Both" is common enough that finding one should not end the search for the other. The full ADHD criteria are in the diagnostic criteria for adult ADHD, in plain language.

When low mood follows from untreated ADHD

Years of missed deadlines, lost jobs, strained relationships and being told to try harder take a toll. Chronic discouragement and self-criticism can follow. Sometimes that amounts to a depressive disorder that needs its own treatment. Sometimes it is demoralization that eases as ADHD is recognized and managed. The difference matters for treatment, and it is a judgment for the evaluating clinician.

The research sources used for this guide do not put a number on how often depression in adults with ADHD is a consequence of the ADHD, so this page does not offer one. The site's article on untreated ADHD in adults describes that experience.

Order of treatment when both are present

No single rule covers every case. The 2024 American Family Physician review of adult ADHD does not say which condition should be treated first, and the first US guideline for adult ADHD had not been published as of October 13, 2026. What follows describes how the decision is generally framed, not a recommendation for any individual.

1. Safety comes first. Thoughts of suicide, inability to function or severe depression take priority over everything else.
2. Then the most impairing condition. If depression is severe, it is hard to assess or treat ADHD accurately until mood improves. If depression is mild and looks secondary to lifelong ADHD, ADHD treatment may come first, with mood watched closely.
3. Then reassess. Once one condition is treated, what remains becomes clearer. Concentration that stays poor after mood recovers points back to ADHD.

Medication considerations

Drug names here are examples of classes, not recommendations.

• The American Family Physician review lists the non-stimulants atomoxetine and viloxazine, and the antidepressant bupropion, as options for adults with ADHD and concurrent anxiety or depression. Bupropion is not FDA-approved for ADHD.
• The FDA label for atomoxetine carries a boxed warning about suicidal thoughts and behaviors in pediatric patients, and the viloxazine label carries a boxed warning about suicidal thoughts and behaviors, so mood is monitored after starting either one.
• The label for one widely used amphetamine product warns of an increased risk of serotonin syndrome when it is taken with serotonergic drugs, a group that includes the common antidepressant classes. Prescribers combine these medications regularly and need to know everything a patient takes.
• Stimulant labels direct prescribers to screen for risk factors for mania before treatment. Bipolar disorder also includes depressive episodes, and it is covered in ADHD or bipolar disorder?

Therapy

NIMH describes depression treatment as typically involving psychotherapy, medication or both. For adult ADHD, cognitive behavioral therapy has supporting evidence, rated low quality by a 2018 Cochrane review, mainly as an addition to medication. Therapy is one place where both conditions can be worked on together.

What to tell an evaluator

• When concentration problems began, with examples from school years if you have them.
• Whether focus improves when your mood is good.
• Past episodes of depression, their length, and what helped.
• Any period of unusually high energy, little need for sleep or uncharacteristic risk-taking.
• Every medication and supplement you take, and alcohol and drug use.
• Family history of ADHD, depression or bipolar disorder.

The practice's evaluation page explains how co-occurring conditions are screened for, and the ADHD and Related Conditions hub covers anxiety and stress. If you are deciding who should do the evaluation, the comparison to read next is psychiatrist or primary care doctor for adult ADHD?