Adult ADHD Self-Report Scale (ASRS-v) Symptom Checklist Instructions The questions on the back page are designed to stimulate dialogue between you and your patients and to help. Signs and symptoms of ADHD in adults can be hard to spot. However, core symptoms start early in life — before age 12 — and continue into adulthood, creating major problems. No single test can confirm the diagnosis. Making the diagnosis will likely include: Standard treatments for ADHD in adults. Adult Attention Deficit Hyperactivity Disorder (ADHD) is a relatively common, often unrecognized condition. It affects % of U.S. adults, but most adults with ADHD live with the symptoms and suffer the often-devastating effects of ADHD in their lives without identifying the source of their struggles.