"due to overwork" is a perfectly correct and usable phrase in written English.
For example: "I was forced to quit my job due to overwork."
When he became ill with the leukemia that claimed his life after nine months, he initially thought his fatigue was due to overwork, his widow said.
"You got caught up in it, but it wasn't due to overwork," Judge Bassler said, adding: "There's no question you betrayed your public trust.
It was due to overwork and insufficient rest; I am a literary critic and had been working very hard on a book.
He seems a classic case of CKD by heat stress due to overwork in the sun, until I ask about his work.
If you're so knackered you can't effectively and consistently intervene to promote learning, or are fed up and losing your zest for the classroom due to overwork or stress (whether caused internally or externally), you yourself won't be as effective at the front of and moving around the classroom.
No longer do they die in large numbers in the first year of life, or later from infectious diseases, or suffer malnutrition, or work themselves to death (except in Japan, where karoshi, suicide due to overwork, is a familiar end; but at least it is voluntary).
He later explained he had gone to Boston for several days, and was surprised to be missed; The Times supposed that the episode was "due to recent overwork in connection with the library".
The defendants, now frail octogenarians, deny any guilt for their roles in the radical communist rule during which about a quarter of Cambodia's population died due to starvation, overwork or execution.
At the start of this year, teaching unions made a joint call for a "significant" salary increase, arguing that there's a "crisis" in recruitment to a profession that people are leaving due to relentless overwork, stress and pressure.
According to a study by insurance provider Simply Business, almost half of the 2,000 individuals surveyed cancel social plans at least once a week, a quarter take less than 10 days' annual leave and 25% have fallen ill due to stress and overwork.
This crazing is most likely due to the overworking of the surface by the finishers.
