The world Health Organisation (WHO) has identified stigma and its associated discrimination as the "single most important barrier" facing people with mental health and behavioural issues.
Indeed, organisations such as the WHO, the World Psychiatry Association and the World Association have identified stigma as a key public health challenge.
The history of "stigma" can be traced back to ancient Greece, where it denoted the identifying marks imprinted on slaves to designate ownership. In the late 16th and early 17th centuries, "stigma" became an indicator of humiliation and degradation.
The contemporary meaning of stigma can be traced to Erving Goffman, a Canadian-born sociologist and writer, who developed the concept of "spoiled identity". This referred to how mental illness is frequently regarded as shameful, effectively depriving people with a mental health issue of their rights.
Goffman described how "courtesy stigma" - stigma by association - can result in family and friends being blamed for a person's mental health status and even risk being accused of sheltering a potentially dangerous person.