For as long as what we now call depression has been recognised, the distinction between normal sadness with cause, and depression without cause has been recognised, that is until recently. The book is a detailed examination of the erosion of this distinction, its causes and its implications.
Observing an increased incidence of depression in medicine, journal papers and books, the question of whether this increase is actual or due to changes to diagnostic criteria is a primary motif of the book. It summarised the development of classifications of mental illnesses with the first Diagnostic and Statistical Manual (DSM-I) being released in 1952. Twenty years later, John Feighner developed the criteria which bear his name but these criteria were for research, not diagnosis, hence they did not address sadness as a cause of depression. This was followed by the Research Diagnostic Criteria (RDC) which was developed to standardise diagnostics and again included no exclusions for bereavement and in which disorders were described more in terms of symptoms not how they related to one or another psychological school or theory. The book also cited the Rosenham study in which eight persons posing as patients who only heard voices, and all of whom were diagnosed as psychotic and most as schizophrenic, as evidence of the mental health profession’s propensity to overdiagnose.
Significantly, when the DSM-III was released in 1980, it cited the Feighner criteria but no papers reporting empirical research to support their use. It enabled diagnoses to be consistent across different practitioners, even if inaccurate, and it abandoned the distinction between excessive and proportionate responses to an identifiable event, although the distinction was retained for anxiety and related ailments. The exception for bereavement when diagnosing depression was retained. The authors contend that the concern about false negative diagnoses is countered by the potential for false positive diagnoses which also have risks, and costs.
The book then cited studies of soldiers in WWII which also failed to distinguish normal responses to trauma to long term mental illness. It also described the application of Freud’s continuum of community mental health lead to the "conclusion" that almost everyone is potentially at risk, noting studies of the population at large required non-psychiatrists to administer the tests and thus misused context, over diagnosing mental illness in the general population. In a study of mental health in one Nova Scotia county, 57% of those tested were "diagnosed" to have depression.
From the Feighner criteria came the diagnostic interview schedule (DIS) used by researchers, not psychologists, to test the general population to determine the unmet mental health needs in the community, however the lack of discretion and permission to ask clarification questions led to ridiculously high claimed rates of depression which, in turn, led to demands for massive increase in resources to treat this supposed need. The book explained the processes of screening & pre-screening and its use of the methods for physical health, but that mental health pre-screening emphasised missing no one with a mental disorder, hence there were many false positives.
The book also examined the not always recognised distinction between normality and disease, citing gum disease which is normal but still a disease whereas some personality traits are unusual but not a disorder, a dysfunction that is harmful, in the medical sense. It also cited shortcomings of classifying symptoms of depression as being on a continuum and the assumption that any symptom may lead to full depression, comparable to claiming that one cough just might indicate tuberculosis, which led to over diagnosis, noting that the vast majority of those with minor symptoms do not develop major depression. This led to providing mental health services to many in the 1960s with problems of living and less to those with actual mental illnesses. Mass screenings of children in schools in an attempt to find indicators of suicide potential found high rates of mental illness and, once again, normal sadness with cause was not considered.
This was followed by observation that after the USA’s Food and Drug Administration (FDA) allowed direct to consumer ads (DTC) for medications in 1997, there was a significant growth in prescriptions for anti-depression meds thereafter in part because patients got prescriptions from GPs, not psychiatrists. It also noted that the fields anthropology, which could have countered the non-distinction between sadness and depression but instead copied it, and sociology, whose Center for Epidemiological Studies measure of depression (CES-D) was even more likely to classify episodes of normal sadness as depression than the DSM, failed to provide a counter the increasingly entrenched non-distinction between normal sadness with cause, and depression. The last chapter summarised and cited why the resistance to change, one reason being that a significant body of research, albeit all based on an invalid definition of depression, would become obsolete. But the financial implications for the entire medical industry that currently treats genuine depression as well as normal sadness seen as depression if the diagnostic criteria were to recognise that sadness with cause is not the same as depression, cannot be ignored.
The book was nothing if not thorough and comprehensive in its examination of the medical profession’s non-recognition of sadness with cause. However, writing this book in a style appropriate to a wider audience but packed to overflowing with detailed and, at times, repetitive citations more aimed at a specialised audience within the field of government health care policy was a bit much for this member of that wider audience. For me, an article that summarised its findings in a serious lay journal such as Quadrant or The New Yorker would have been more appropriate.