ADHD, which is short for attention deficit hyperactivity disorder, is a developmental problem that begins in childhood. Symptoms of ADHD typically start showing before age 7, but it’s not uncommon for children to remain undiagnosed until they reach adulthood.

Children who have undiagnosed ADHD might be labeled as disruptive and willfully unruly, but in truth, they don’t understand their own feelings and reactions, and they’re not able to effectively manage their situations.

As adults, people with undiagnosed ADHD tend to perform below their capability levels, finding it hard to keep a job or pursue a career. They also struggle with relationships, are more likely to get into trouble with the police, and are more prone to substance abuse issues.