Anxiety, depression, OCD, bipolar disorder, and PTSD can present in remarkably similar ways — inner unrest, low mood, poor concentration, disrupted sleep, irritability, or ruminative thinking. Dr. Rao takes the time to distinguish between them, since treatment differs significantly by diagnosis. Bipolar depression, for example, is treated differently than unipolar depression, and antidepressants are generally not used alone as a first-line treatment in bipolar illness. OCD is evaluated with particular care, since many people carry intrusive thoughts and compulsions privately for years out of shame or fear of being misunderstood. Because trauma, OCD, bipolar-spectrum illness, anxiety, depression, and medical conditions can overlap considerably, diagnosis rests on a comprehensive psychiatric history and clinical judgment — not a symptom checklist — so treatment fits the individual rather than the most visible symptom.