Karōshi (過労死?), which can be translated literally as "overwork death" in Japanese, is occupational sudden mortality. The major medical causes of karōshi deaths are heart attack and stroke due to stress and a starvation diet. This phenomenon is also widespread in South Korea, where it is referred as 'gwarosa' (과로사/過勞死). In China, overwork-induced suicide is called 'guolaosi' (过劳死).
The first case of karōshi was reported in 1969 with the stroke-related death of a 29-year-old male worker in the shipping department of Japan's largest newspaper company. The term was invented in 1978 to refer to an increasing number of people suffering from fatal strokes and heart attacks attributed to overwork. A book on the issue in 1982 brought the term into public usage, but it was not until the mid to late 1980s, during the Bubble Economy, however, when several high-ranking business executives who were still in their prime years suddenly died without any previous sign of illness, that the term emerged into Japanese public life. This new phenomenon was immediately seen as a new and serious menace for people in the work force. In 1987, as public concern increased, the Japanese Ministry of Labour began to publish statistics on karōshi.
Japan's rise from the devastation of World War II to economic prominence in the post-war decades has been regarded as the trigger for what has been called a new epidemic. It was recognized that employees cannot work for 12 or more hours a day, 6–7 days a week, year after year, without suffering physically as well as mentally. It is common for the overtime to go unpaid.
In an International Labour Organization article about karōshi, the following four typical cases of karōshi were mentioned: