Well according to t h i s b enefitwelfarespendingWhat it shows is that the Department for Welfare and Pensions is the biggest spending department in the UK spending 166 . 98 bn in 201112 , which is Of that huge sum , 159 bn was spent on benefits an increase of 1 . 1 % on the previous year . That is 23 % of all public spending . I ' m sure its higher now in 2016 with inflation etc . The cost of that from purely mental health is around 70 bn that is 2014 im sure its higher today t o o n e e d s t o t a c k l e highcostofmentalillhealth . htmSo almost half . Now if say 10 % for example , were lumbered into mental health when diagnosing properly with enough tests could of infact found out it was not mental health , and then they got the right treatment and got back to work . Thats 7 bn saved purely in one year for those who got the treatment and could get back to work . Not only do you save 7 bn you also gain on top of that from the taxes they pay from working . So its not just a 7 bn saving here . Note that is financial sick leave saved per year . Tests obviously cost , but they are a one time payment for each person since you don ' t test them every year , so over time this is saving money . Now if they need medication and that medication helps them get back to work , this is fine , since any medication that costs more than your entire year of salary would not even be viable option in the first place . And most people can afford meds if they work . Since otherwise those meds would not be even on sale because no one could afford it . So if they need meds every month and it costs X amount per month , its in no way going to cost more than what they earn per month so they are still contributing to the economy here even after saving the 7 bn . This alone then also improves their mental health and stress levels because they got their life back , and maybe they won ' t even need the medication for ever some people do seem to get control of their depression anxiety over time once they got their life back on track . Also some times people who are given thorough testing and are told they found nothing , gives them closure , lets them conclude it really is psychological and that alone may allow them to stop worrying about it and get back to work . Additionally , if you leave them doubting the diagnosis with only a handful of tests done and a Dr . just makes an education assumption , they will likely google stuff , and could end up developing health worryanxieties because it is unresolved in their mind . This is often why people resort to self experimenting , and you see stupid websites like how i cured my xyz . BUY my book now to learn the secret medical professions don ' t want you to know ! etc . None of it works so they get more miserable as they feel theres nothing that can help them , if they get worse they may need even more treatment which could of been avoided . People get desperate so they buy into it , so people get scammed or they resort to buying power foods that they believe from reading the internet can cure cancer and stupid stuff like that which is exploiting desperate people . This in turn also causes people to develop a distrust in the medical world and some then won ' t even seek a doctor another problem to tackle . We ' ve seen those who have mental problems who don ' t seek help in USA for example a small handful of people with diagnosed issues who were a high risk , grab a gun and shoot people . Others kill themselves because they believe theres no help for them . Both of these then effect mental health of friends and families or victims , or society as a whole and then even more people have anxieties or depression that need treatment . Here we have a spiral effect . My final few paragraphs are important factors that numbers alone do not show youfactor in but are very important to consider . But governments don ' t see the long game . So it will never happen .