However, the effects of stressful working conditions on mental health are equally costly.

BBC: Stress: The effects

He or she might ask you questions about your child's development, how long your child has been behaving this way, teachers' or caregivers' perceptions of the problem, and any family history of mental health conditions.

CNN: Mental illness in children: Know the signs

The percentage of people with mental health conditions who go into the support group for ESA has more than tripled since 2010.

BBC: woman with mental health problem

The commission looked at the cases of 200 people treated for mental health conditions under community-based compulsory orders.

BBC: Borders mental health care standards praised

Mr Knowles indicated Dewani's legal team would fight this on the grounds of his poor mental health and prison conditions in South Africa.

BBC: Shrien Dewani detained in Bristol secure hospital

It says for some years it's been exploring the possible uses of virtual reality in treating mental health conditions, but this is still very much "work-in-progress".

BBC: Virtual reality tackles 'shell shock'

It seeks to remove legislative provisions that can prevent people with mental health conditions from serving as Members of Parliament, members of the devolved legislatures, jurors, or company directors.

BBC: MPs support an end to mental health discrimination.

And finally, those who suffer from seasonal affective disorder (SAD) or other mental health conditions can find the darkness of winter especially difficult, making them less productive and interested in work.

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The NHS in England is not doing enough to help people with mental health conditions quit smoking, an influential group of doctors has warned.

BBC: NHS 'ignoring smoking in mental health patients'