Recent research suggests that attention-deficit/hyperactivity disorder (ADHD) may include at least three distinct subtypes, particularly highlighting a volatile form associated with significant emotional dysregulation. Dr. Francisco Xavier Castellanos, a prominent neuroscientist at New York University's Langone Medical Center, emphasizes that individuals with this subtype struggle to regulate their emotions, which can lead to intense outbursts and destructive behavior. Castellanos, who has dedicated 35 years to studying ADHD, believes that the latest findings support the long-held belief among researchers and clinicians regarding the complexity of ADHD. This evolving understanding of ADHD is crucial as it presents new challenges in developing effective treatment strategies for those affected.