Serious mental illnesses are a small subset of the 300 mental illnesses that are in DSM. While it is fair to debate where the line between serious mental illness (SMI) and poor mental health is, the extremities are clear. The Center for Mental Health Services defined SMI as
mental illnesses listed in DSM
that “resulted in functional impairment which substantially interferes with or
limits one or more major life activities.” (CMHS 1999)
By all accounts, serious mental illnesses include “schizophrenia-spectrum
disorders,” “
severe bipolar disorder,”
and “
severe major depression” as
specifically and narrowly defined in DSM.
People with those disorders comprise the bulk of those with serious mental
illness. However, when other mental illnesses cause significant functional
impairment they also count as a serious mental illness.
Schizophrenia (NIMH defines all schizophrenia as “severe”): 1.1% of the population (FN 1)
The subset of bipolar disorder classified as “severe”: 2.2% of the population (FN 2)
The subset of major depression called “severe, major depression”: 2.0% of the population (FN 3)
Therefore total “severe” mental illness in adults by diagnosis: 5.3% of the population (FN 4)
US mental health spending and mental health non-profits focus almost exclusively on people who do not have serious mental illness, rather than those who do. This is the single major problem with the US mental health system. Money is not lacking. Prioritization is.