What is Karoshi? Literally meaning ‘death by overwork’, Karoshi (過労死) is a uniquely Japanese socio-medical phenomenon. It refers to sudden death resulting from cardiovascular or cerebrovascular diseases triggered by extreme work-related stress, sleep deprivation, and physical exhaustion.
When you walk through Shinjuku or Marunouchi at 10:00 PM on a Tuesday, you’ll still see hundreds of illuminated office windows. As an expat, it is easy to view this as mere ‘dedication,’ but living here reveals the darker undercurrents. Unlike the Western concept of burnout, karoshi is a clinical and legal categorization in Japan.
I remember sitting with a colleague who had been in the office for three straight weeks, sleeping under his desk on a rolled-out yoga mat. When I asked if he was okay, he simply smiled and said, ‘It is just how we contribute to the team.’ That complete erasure of the self for the sake of the group is the root of the issue.
Understanding karoshi requires navigating the thin line between Giri and Ninjo. Often, the sense of social obligation (giri) outweighs one’s basic human need for rest (ninjo). It isn’t just about ‘working hard’; it’s about the inability to say ‘no’ to a superior or to leave before your peers.
Pro-Tip: If you are working in a Japanese office, pay close attention to ‘Osaki ni shitsurei shimasu’ etiquette. While it is the polite way to leave, never be the first to leave every single day unless you have clear boundaries established. The silent pressure to stay is the first step toward the fatigue that leads to karoshi.
Foreigners often make the mistake of assuming that karoshi only affects the elderly or middle-aged. However, we see it increasingly among younger workers in demanding fields like tech, advertising, and retail. Many newcomers try to ‘out-work’ their Japanese counterparts to prove their value, which is a dangerous trap. You are not proving your value; you are merely assimilating into a system that may not have a mechanism to protect you from burnout.
We also need to distinguish between Karoshi and Karojisatsu. While karoshi is physical failure, karojisatsu refers to suicide prompted by extreme overwork and stress. The terminology is stark, but necessary to understand the mental weight of Japanese corporate life. For a deeper look at why it’s so hard to step away, check out our piece on Honne and Tatemae, which explains why what people say (tatemae) often masks the reality of their suffering (honne).
The Nuance of Language and Slang
In modern office slang, younger generations have started using terms like ‘black kigyo’ (black companies) to describe firms that exploit their employees to the point of karoshi. If you hear a Japanese friend say a company is ‘black,’ they aren’t talking about colors—they are warning you that the culture is toxic and likely dangerous to your health.
The shift is happening slowly. With new government ‘Work Style Reform’ initiatives, there is more focus on leaving by 7:00 PM. But as any resident will tell you, changing laws is much easier than changing a culture that has been built on the foundation of self-sacrifice for decades.
