Psychiatry gets lots of remarks claiming it is a medical specialty that lacks scientific evidence to back up the disorders. If the field gets more government funding, it will be very possible to invent types of neuro technology that is capable of discovering neuro-bio markers that will prove the physical existence of these diseases.
Mental illness is a disease that is just as concerning as cancer and heart disease. The truth is that we know very little about mental illnesses. Psychiatry is a relatively new science and even though many scientists and doctors who study the brain claim to know everything, truth is, they don't!
Diseases like cancer and heart disease are fatal and more research dollars leads directly to better treatments and saved lives. Mental health is certainly a quality of life issue, but it is rare that mental health research will actually save a life, therefore it requires some research funding, but nothing on the level of fatal diseases like cancer and heart disease.