Psychiatrists approach the diagnosis of Attention Deficit Hyperactivity Disorder (ADHD) through behavioral assessments rather than relying on genetic tests or brain scans, which cannot definitively identify mental health conditions. When psychiatrists state that a patient has ADHD, they are essentially making a judgment based on observed behaviors and reported experiences. This diagnosis is part of a broader framework that includes the Diagnostic and Statistical Manual of Mental Disorders (DSM), which organizes mental health conditions into symptom-based categories. However, this classification can create the illusion that mental disorders are distinct entities with clear boundaries. Research indicates that while there are biological irregularities associated with mental illnesses, these do not correspond neatly with the DSM classifications. For example, individuals with similar genetic backgrounds may receive different diagnoses, such as bipolar disorder or schizophrenia, highlighting the complexity of mental health diagnoses and the need for a nuanced understanding of these conditions.