It is not surprising that most mental illness goes untreated. While most people with physical illness are in treatment, this is true for fewer than one in three people with mental illness. This figure applies throughout the advanced world, and even for major depressions the figure is under a half in Britain, the USA, and continental Europe. If your pancreas is not working you automatically get treatment, but if your mind has been disordered for decades you do not.

Why Do Fewer Than One in Three People With Mental Illness Receive Treatment? | Richard Layard