<P> The relative proportion of the public officially diagnosed with mental disorders was increasing, however . This has been linked to various factors, including possibly humanitarian concern; incentives for professional status / money; a lowered tolerance of communities for unusual behavior due to the existence of asylums to place them in (this affected the poor the most); and the strain placed on families by industrialization . </P> <P> The turn of the 20th century saw the development of psychoanalysis, which came to the fore later . Kraepelin's classification gained popularity, including the separation of mood disorders from what would later be termed schizophrenia . </P> <P> Asylum superintendents sought to improve the image and medical status of their profession . Asylum "inmates" were increasingly referred to as "patients" and asylums renamed as hospitals . Referring to people as having a "mental illness" dates from this period in the early 20th century . </P> <P> In the United States, a "mental hygiene" movement, originally defined in the 19th century, gained momentum and aimed to "prevent the disease of insanity" through public health methods and clinics . The term mental health became more popular, however . Clinical psychology and social work developed as professions alongside psychiatry . Theories of eugenics led to compulsory sterilization movements in many countries around the world for several decades, often encompassing patients in public mental institutions . World War I saw a massive increase of conditions that came to be termed "shell shock". </P>

When was the term mental illness first used