Is depression truly a medical illness/medical disease?; what exactly is a medical disease/medical illness?; is depression a verified medical illness/medical disease?; is depression really a biological – and therefore, medical – illness/disease?; is depression really/truthfully a brain disease/brain disorder?; what constitutes a medical disease/medical illness?; key characteristics of a medical disease/medical illness; how a medical disease is diagnosed; the three pillars of medical diagnosis; five verified medical brain diseases meeting the criteria for a medical disease; does depression meet the long-established medical criteria for a medical brain disease/illness; how depression is diagnosed; depression as referred to in medical pathology textbooks; who treats abnormalities of brain function?; brain is depression due to abnormalities in brain function?; is depression included in reputable lists of verified brain/neurological disorders?; who are society’s appointed brain experts?; neuroscience and depression; is depression a medical illness just like diabetes?