Millennials are bringing mental health to the forefront in the workplace.

About half of millennials and 75% of Gen Zers have left a job because of mental health reasons, a study conducted by Mind Share Partners, SAP, and Qualtrics and published in the Harvard Business Review found. The study, which looked at mental-health challenges and stigmas in the US workplace, polled 1,500 respondents ages 16 and older working full time.

That was significantly higher than the overall percentage of respondents who said they had left a job for mental-health reasons, 20%. This indicates a "generational shift in awareness," said the authors of the report, Kelly Greenwood, Vivek Bapat, and Mike Maughan.

That shift is no surprise, considering that millennials have also become known as "the therapy generation." They're cognizant about their mental health and helping to destigmatize therapy, Peggy Drexler wrote in a March essay for The Wall Street Journal.

Millennials, she said, see therapy as a form of self-improvement — and they also suffer from a desire to be perfect, leading them to seek help when they feel they haven't met their expectations.

But their inclination toward therapy also highlights some of the biggest problems plaguing the generation.

Read more: Depression is on the rise among millennials, but 20% of them aren't seeking treatment — and it's likely because they can't afford it

Depression and 'deaths of despair' are becoming more common among millennials

Depression is on the rise among millennials, who have seen a 47% increase in major-depression diagnoses since 2013, a 2018 Blue Cross Blue Shield report said. And a follow-up Blue Cross Blue Shield study in April found that millennials were less healthy than Gen Xers were at their age and were more likely to be less healthy as they age.

More millennials are also dying "deaths of despair," or deaths related to drugs, alcohol, and suicide, Jamie Ducharme reported for Time in June, citing a report by the public-health groups Trust for America's Health and Well Being Trust. While these deaths have increased across all ages in the past 10 years, they've increased the most among younger Americans, Ducharme said.

They accounted for the deaths of about 36,000 American millennials in 2017 alone, the report said. Drug overdoses were the most common cause of death.

There are a few reasons behind the uptick, one of which is that young adults are more inclined to engage in risk-taking behaviors. However, the report also identified other structural factors at play, namely the many financial problems millennials are facing: student-loan debt, healthcare, childcare, and an expensive housing market.

These four costs are part of the Great American Affordability Crisis plaguing millennials and putting them financially behind.

Read more: 'Deaths of despair' are taking more lives of millennial Americans than any other generation

Burnout is also a problem

Cases of burnout have also been increasing at an alarming rate in recent years, Business Insider's Ivan De Luce reported. The World Health Organization recently classified burnout as a syndrome, medically legitimizing the condition for the first time.

It's a growing problem in today's workplace because of trends like rising workloads, limited staff and resources, and long hours — particularly for millennials, who also consider themselves the "burnout generation."

Eighty-six percent of respondents in the Mind Share Partners, SAP, and Qualtrics study said a company's culture should support mental health. "Mental health is becoming the next frontier of diversity and inclusion, and employees want their companies to address it," the authors wrote.

They added: "It is not surprising then that providing employees with the support they need improves not only engagement but also recruitment and retention, whereas doing nothing reinforces an outdated and damaging stigma."