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Symptoms of ADHD in Adults Many adults suffering from ADHD go through life undiagnosed. Family members and friends mistakenly attribute their symptoms to unruly behavior, bad habits or flaws in character. ADHD can cause people to appear agitated or anxious. They may also appear rushed, irritable, or agitated. Symptoms may be visible in school, work and social situations. For a diagnosis of ADHD, several inattentive and hyperactive-impulsive symptoms must have been present before age 1