When you are undiagnosed with attention-deficit hyperactivity disorder (ADHD), life is challenging in ways that are often invisible to others. It’s not simply a matter of difficulty concentrating or being disorganized once in a while. For people with untreated ADHD, every day is an uphill battle with no end in sight. Fortunately, there are many effective treatments for adults who have been diagnosed with ADHD later in life, so you aren’t doomed to struggle with the effects of undiagnosed ADHD forever. In fact, the sooner you begin treatment and take action to address the challenges that untreated ADHD presents, the better your outcome is likely to be.