Understanding Adult ADHD
Difficulty focusing is a symptom—not a diagnosis.
What does ADHD actually mean?
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder marked by a persistent pattern of inattention and/or hyperactivity–impulsivity that interferes with functioning or development. It is not simply being tired, distracted, overcommitted, or occasionally unable to concentrate.
For adults, DSM-5-TR assessment includes at least five symptoms of inattention and/or hyperactivity–impulsivity that persist at least six months, several symptoms present before age 12, symptoms in two or more settings, clear functional impairment, and consideration of whether another condition better explains the symptoms. A clinical interview, developmental history and corroborating information are important; no blood test or questionnaire alone diagnoses ADHD.
“A symptom deserves attention. A diagnosis deserves evidence.”
What else can make it hard to focus?
Sleep and fatigue
Insomnia, insufficient sleep, obstructive sleep apnea, shift work, and chronic sleep deprivation can cause significant cognitive problems.
Mental health
Depression, generalized anxiety, PTSD, bipolar mood episodes, grief, and chronic stress can affect memory, motivation and attention.
Hormonal and medical factors
Perimenopause/menopause, thyroid disease, iron-deficiency anemia or other anemia, nutritional deficiencies, chronic pain, and other illness can contribute.
Medications and substances
Alcohol, cannabis, other substance use or withdrawal, sedating antihistamines, other medicines, excess caffeine, and changes in nicotine use can interfere with attention or sleep.
Timing matters: Problems beginning only recently, after a new medication, with disrupted sleep, or alongside a mood episode call for careful evaluation—not an automatic ADHD label. Multiple conditions can coexist with ADHD.
Adult ADHD screening: ASRS
Adults only: This screening instrument is intended for evaluating possible ADHD symptoms in adults, not children or adolescents. An adult diagnosis still requires a thorough clinical evaluation and evidence of symptoms beginning in childhood.
The Adult ADHD Self-Report Scale (ASRS) is a validated screening instrument. It helps determine whether further evaluation is appropriate; it cannot confirm or exclude ADHD. We link to the established instrument rather than rewriting or modifying its validated questions.
Validated ADHD questionnaire
Open the AAFP adult ADHD toolkit and select the ASRS and symptom checklist v1.1 or ASRS DSM-5 screener from its forms and rating scales section. Complete or print it and bring the results to your appointment.
Complete the original questionnaire below or open the source PDF to print it. Its questions, response options, formatting, and scoring instructions are supplied unchanged by the originating source.
Open / print original questionnaire →
Source: Harvard / WHO ASRS v1.1. This instrument is a screening aid, not a diagnosis. EvolveMD does not collect responses through this embedded PDF. Some browsers may require opening the PDF in a new tab.
What a comprehensive evaluation includes
A clinician explores childhood and school history, workplace and home functioning, sleep, mood, anxiety, substance use, medication effects, family history, and selected laboratory testing when indicated. Correct diagnosis helps identify the most useful treatment—not merely attach a label.
Sleep Resources · Depression · Anxiety · Bipolar disorder
Sources: AAFP Adult ADHD Toolkit; AAFP: ADHD in Adults (2024).
VA Adult ADHD Complete Reference Guide
Open or download the original reference PDF. Screening cannot diagnose a condition; bring completed results to a clinician.
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