5 Mental Health Conditions That Mimic ADHD Attention-deficit hyperactivity disorder (ADHD) is one of the most common mental health disorders affecting children across the world. Although the disorder strikes at a younger age, the symptoms may penetrate even into the adulthood. Most children diagnosed with ADHD show debilitating behaviors such as inattention, hyperactivity and impulsivity, which interfere with their activities in school or at home. According to a recent report by the Centers for Disease Control and Prevention (CDC), as of 2011, nearly 11 percent American children aged four to 17 years were diagnosed with ADHD. Sadly, ADHD is often misdiagnosed by doctors, primarily due to its overlapping symptoms with other mental health conditions, such as bipolar disorder, autism, sleep disorders, etc. Only a mental health professional can differentiate between the symptoms of ADHD and other mental health conditions. Listed below are a few mental illnesses whose symptoms mirror ADHD symptoms: 1. Bipolar disorder While bipolar disorder is a mood disorder that results in unusual shifts in mood, energy and activity levels and hampers the ability to carry out day-to-day tasks, it is often confused with ADHD due to the presence of certain common symptoms, like mood instability, sudden outbursts, restlessness, talkativeness and impatience. 2. Autism spectrum disorder A child diagnosed with autism spectrum disorder (ASD) exhibits a group of developmental disorders comprising ongoing social problems and repetitive behaviors that usually appear during the formative years. Some of the symptoms of ASD, such as hyperactivity, social development issues, and emotional immaturity, often overlap with the symptoms of ADHD, which, in turn, leads to misdiagnosis.