Work hard.

Stay late.

Don’t leave before your boss.

Catch the last train home.

Then do it again tomorrow.

Japan’s intense work culture became associated with a word so serious that it eventually travelled around the world:

過労死 (karōshi).

It literally means:

過労 (karō) = overwork
死 (shi) = death

Death from overwork.

It sounds almost unbelievable that a language would need a word for this.

But karōshi became a major social and public-health issue in Japan—and today, Japan even has a law and an annual government white paper devoted to preventing it.

So where did karōshi come from?

And can someone really die from working too much?

Let’s take a look.

First, What Does Karōshi Mean?

過労死 (karōshi) literally means death from overwork.

But it doesn’t mean someone simply becomes exhausted and suddenly dies at their desk.

Japan’s legal definition is more specific.

The government’s broader category 過労死等 (karōshi-tō) includes deaths caused by cerebrovascular or heart disease resulting from excessive work burdens, as well as suicide resulting from a mental disorder caused by severe psychological stress at work. It also covers qualifying illnesses that do not result in death. 

So karōshi is connected to serious consequences such as:

Stroke.

Heart disease.

And in the broader legal category, severe work-related psychological illness and suicide.

It isn’t simply:

“I worked way too much this week.”

It is a recognized occupational-health issue.

When Did Karōshi Begin in Japan?

The problem didn’t suddenly appear when the word was invented.

One early case described in Japanese government-funded research dates to 1969, when a 29-year-old newspaper worker died from a stroke. 

The word karōshi itself began appearing in Japan in the late 1970s. 

Eventually, the phenomenon attracted growing attention from doctors, lawyers, families, researchers and the media.

And a word that once described an extreme occupational-health problem became internationally recognizable:

KAROSHI.

Why Did Karōshi Become Associated With Japan?

To understand that, we have to look at Japan’s postwar working culture.

As Japan's economy grew rapidly after World War II, the company became an extremely important part of life for many workers.

Long-term employment at one company became an ideal for many white-collar employees.

There was also a strong emphasis in many workplaces on commitment to the group.

That could mean:

Working long hours.

Staying after normal working hours.

Socializing with colleagues after work.

And sometimes feeling uncomfortable leaving before senior coworkers.

Of course, not every Japanese company or employee works this way.

But excessive working hours became serious enough that karōshi developed into a national policy issue.

Can Working Too Much Really Cause Death?

Extreme and sustained work demands can contribute to serious health risks.

Japan’s official karōshi framework specifically recognizes cerebrovascular and cardiovascular diseases associated with excessive work burdens. 

That includes conditions affecting the heart and brain.

Long working hours can also mean something else is disappearing:

Sleep.

And lack of recovery matters.

Japan’s government has reported links between insufficient sleep, accumulated fatigue and poorer mental-health indicators in its research on overwork. 

So karōshi isn't simply about the number written on a timesheet.

It’s about what sustained excessive work can do to the body and mind.

Is Karōshi Only About Heart Attacks and Strokes?

This is where the terminology gets a little more complicated.

Traditionally, karōshi is strongly associated with fatal cardiovascular and cerebrovascular disease caused by overwork.

But Japanese law uses the broader term:

過労死等 (karōshi-tō)

Meaning roughly:

“karōshi and related conditions.”

This legal category also includes suicide resulting from mental disorders caused by severe psychological stress at work. 

You may also encounter another Japanese term:

過労自殺 (karō jisatsu)

過労 = overwork
自殺 = suicide

It refers to suicide associated with excessive work and workplace stress.

So Japan’s modern approach to overwork recognizes both physical and psychological harm.

How Big Is the Problem Today?

Karōshi is not simply a story from Japan's economic-boom years.

Japan still tracks work-related illnesses and deaths every year.

According to the government’s 2025 White Paper on Measures to Prevent Karoshi, covering fiscal 2024, 241 workers’ compensation cases involving cerebrovascular or cardiovascular disease were approved among private-sector workers, including 67 fatal cases. 

For work-related mental disorders, 1,055 cases were approved, including 88 cases involving suicide or attempted suicide. These figures are workers’ compensation approvals, not a count of every person in Japan who may have suffered from overwork.

That distinction matters.

But they show something important:

Karōshi has not disappeared.

Does Japan Officially Recognize Karōshi?

Yes.

And this may be one of the most surprising parts of the story.

In 2014, Japan enacted the:

過労死等防止対策推進法

Act Promoting Measures to Prevent Death and Injury from Overwork.

The law says that karōshi and related conditions are a major social problem and establishes measures including research, public awareness and prevention. 

Japan also publishes an annual:

過労死等防止対策白書

White Paper on Measures to Prevent Karoshi, etc.

The government reports it to the Diet every year and uses it to examine overwork, workers’ compensation cases and prevention measures. 

Think about that for a moment.

Japan has an official government white paper...

about preventing death from overwork.

Is There a Specific Number of Hours That Means Karōshi?

Not exactly.

You may sometimes hear people talk about the:

過労死ライン (karōshi line)

or “karōshi line.”

This refers to overtime levels used when assessing whether excessive work may have contributed to certain work-related illnesses.

But it shouldn't be interpreted as:

“Anything below this number is safe.”

Health risk depends on many factors, including workload, sleep, stress, working conditions and the individual.

The important idea is that very long working hours can provide evidence of an excessive occupational burden.

Karōshi isn't a magic number.

It is the result of serious harm associated with work.

Did Japan Try to Change Its Long-Hours Culture?

Yes.

Japan has introduced a number of reforms aimed at reducing excessive working hours.

These include overtime limits, workplace mental-health measures, efforts to encourage workers to take paid leave and reforms affecting industries historically associated with particularly long hours.

Japan’s government continues to identify long-hours reduction, mental-health measures and harassment prevention as central parts of its karōshi-prevention strategy. 

That doesn’t mean the problem has been solved.

Workplace cultures don't change overnight.

But modern Japan is not simply accepting karōshi as:

“That's just Japanese work culture.”

Preventing it is official government policy.

What Is Japan’s “Work Style Reform”?

You may hear the Japanese phrase:

働き方改革 (hatarakikata kaikaku)

It means:

Work Style Reform.

The idea is to rethink how people work in Japan.

One major goal has been reducing excessive working hours.

Japan has also introduced legal limits on overtime, although the rules and exceptions vary depending on circumstances and industry.

These reforms represent a significant shift from the image of the employee who simply stays at the office for as long as necessary.

The question is slowly changing from:

“How long did you work?”

to:

“How should we work?”

Is Everyone in Japan Working Extremely Long Hours?

No.

This is an important stereotype to avoid.

Japan certainly has a documented history of excessive working hours and karōshi.

But that doesn't mean every Japanese employee is working until midnight.

Workplaces vary enormously.

A small creative company in Tokyo can have a completely different culture from a traditional corporation.

A government office can differ from a restaurant.

A tech company can differ from a hospital.

And working practices in Japan have changed over time.

So karōshi tells us something important about Japanese labor history.

It does not describe the daily life of every Japanese worker.

Why Did the Word Karōshi Become Famous Outside Japan?

Because the idea is shocking.

Many languages can describe someone who is overworked.

Japan created a compact word for an extreme consequence:

過労死

Death from overwork.

As international attention turned toward Japan's working culture, karōshi began appearing outside Japan too.

The word became useful because the underlying problem isn't exclusively Japanese.

Excessive working hours, sleep deprivation, occupational stress and burnout can occur in many countries.

So a Japanese word ended up describing a conversation much bigger than Japan.

Is Karōshi the Same as Burnout?

No.

They can be related to similar workplace pressures, but they aren't interchangeable.

Burnout generally describes a state associated with chronic workplace stress.

Karōshi refers to death associated with excessive work, while Japan’s broader legal category karōshi-tō also includes specified serious work-related diseases and mental disorders even when they are not fatal. 

So saying:

“I'm so burned out. It's basically karōshi.”

isn't really accurate.

Karōshi is the extreme end of work-related harm.

What Does Karōshi Tell Us About Japanese Work Culture?

Perhaps the most interesting thing about karōshi isn't simply that the word exists.

It's that Japan eventually began questioning the culture surrounding it.

Working hard had long been associated with responsibility, loyalty and dedication.

But there is a point where dedication becomes harmful.

That tension is still part of Japan's conversation about work today.

How much should we give to our jobs?

When does working hard become working too much?

And perhaps most importantly:

What is work worth if it costs someone their health—or their life?

Frequently Asked Questions

What does karōshi mean?

Karōshi (過労死) literally means death from overwork.

How do you pronounce karōshi?

Approximately:

kah-roh-shee

The long ō in karō is held slightly longer.

Is karōshi a real medical or legal concept in Japan?

Yes. Japanese law formally defines 過労死等 (karōshi-tō), a broader category covering specified deaths and illnesses associated with excessive occupational burdens or severe psychological stress at work. 

When did the word karōshi appear?

Japanese Ministry of Health, Labour and Welfare material says the term first appeared in Japan in the late 1970s.

Is karōshi still a problem in Japan?

Yes. Japan continues to record workers’ compensation claims and approved cases involving work-related cardiovascular disease and mental disorders, and the government publishes annual data and prevention measures. 

Is karōshi the same as burnout?

No. Burnout and excessive work may be related, but karōshi refers to the extreme outcome of death associated with overwork. Japan’s broader karōshi-tō category also covers certain nonfatal work-related illnesses.

Does karōshi only happen in Japan?

No. Serious health consequences associated with excessive work can occur elsewhere. The word karōshi, however, originated in Japan and became internationally recognized.

🇯🇵 Keep Discovering Japan

If you enjoyed discovering the story behind karōshi, explore What Is a Nyūshashiki (入社式)? Japan’s Company Entrance Ceremony to discover how many Japanese employees begin their working lives together each spring. 🌸💼

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Email at 9:03 PM?

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But even Salary Meow needs to learn one very important lesson:

Working hard and working endlessly are not the same thing.

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At JapPop, we celebrate Japanese culture through playful illustrations, original characters, and stories inspired by everyday life in Japan.

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過労死 means death from overwork.

But its story is really about something bigger:

how Japan began confronting the cost of working too much.

Discover Japan, one story at a time. 🇯🇵✨