Herbert J. Freudenberger, the psychologist who defined burnout, became involved in the 'free clinic' movement in the late 1960s. It was a community-based clinic that served alienated populations in the US, including hippies and drug abusers.

Volunteer staff helped with drug abuse treatment and detoxification. The people talked about being "burnt out" by drug addiction. Freudenberger worked his second job at the clinic until midnight until he finally found himself in a state of exhaustion. In his self-diagnosis, he borrowed the metaphor drug users invented to describe their suffering.

Herbert J. Freudenberger, having experienced the state of burnout himself, wrote an essay on "staff burnout". He extended the idea to staff of all sorts, including attorneys, child-care workers, medical professionals and parents. He found burnouts everywhere and popularised the idea in interviews and self-help books.

Now, burnout wasn't what happened to you when you had nothing - it was what happened to you when you wanted it all. It made the term a yuppy problem, a badge of success.

The press picked up on burnout and filled pages of newspapers and magazines with new categories of burned-out workers, from lists of symptoms to quizzes. Everyone suffered.

The sceptics fired back. "The new IN thing is 'burnout,'" a Time columnist wrote. "If you don't come down with it, you're a bum." Even Freudenberger was tired of burnout. Still, in 1985, he published a new book on Women's Burnout. The press loved quoting him, writing that "you can't have it all."

For philosopher Byung-Chul Han, burnout is depression and exhaustion - it is a sickness that plagues a society bent on excessive positivity and achievement to the point of self-destruction.

Burnout keeps on spreading. With the emergence of the internet, people start speaking about "digital burnout." Social media burns you out. Gig work burns you out. It is no longer a temporary problem - it's a modern problem.

• Declining church attendance could be one reason with less than half of the population attending church. Wellness, mindfulness, and meditation are secularised versions of prayer, Sabbath-keeping, and worship. However, many Christians also suffer from burnout.
• Another is overwork, but every generation claims enormous economic and social upheaval and changes in the labour market.
• Burnout is a combat metaphor. Many feel like work is a battlefield, and daily life like a struggle. People from all walks of life feel worn down, wiped out, battered and battle-scarred.