ADHD is one of the neurobehavioral illnesses that affect children and teenagers the most frequently and requires treatment. With severe symptoms and disability that often last into adulthood, ADHD is frequently chronic. Co-occurring disorders like disruptive, mood, anxiety, and substance misuse are frequently linked to ADHD. By reviewing symptoms and impairment, the clinical diagnosis of ADHD is made. Genetic, neuroimaging, neurochemistry, and cognitive findings all support the disorder's biological basis. When diagnosing and treating ADHD, it is important to take into account every area of the patient's life. Support for education, families, and individuals are part of multimodal treatment. For comorbid issues such as ADHD, both medication and psychotherapy are helpful. In the long-term management of ADHD across the lifespan, pharmacotherapy, including stimulants, noradrenergic drugs, alpha agonists, and antidepressants, is crucial.