If you're working in a stressful job it's not just your blood pressure at risk.
Your efforts to keep your boss happy may be pleasing them - but it leaves your body at risk of cancer, groundbreaking new research has found.
Working in a stressful job for 15 years increases the risk of five forms of the disease, scientists warn.
Job insecurity, high work load, time pressures should be considered a public health issue, experts now argue.
Although stress can cause a number of physical health problems previous research suggesting it can cause cancer is weak.
Some studies have indicated a link between various psychological factors and an increased risk of developing cancer, but others have not.
But to determine the link, researchers from Quebec University measured the prevalence of cancer in men with work-related stress.
However, high work load and time pressure weren't the only two factors of stress mentioned by participants.
Job insecurity, financial problems and dealing with customers were also listed by some of the 3,103 adults who had been diagnosed with cancer.
Others included challenging or dangerous work conditions, employee supervision, interpersonal conflict and a difficult commute.
Subjects described in detail each job held during the lifetime - including the occurrence of stress and its cause.
Significant links to stomach, lung, colon, rectal cancer and non-Hodgkin lymphoma were found, the study published in Preventative Medicine reports.
These were observed in men who had been exposed to just 15 years of work-related stress.
But the links were not found in those who had been under high levels of pressure for less than 15 years.
The researchers believe people under stress may start smoking, overeating or drinking alcohol - known risk factors.
The most stressful jobs included firefighters, industrial engineers, mechanic foremen and vehicle and railway-equipment repair workers.
Study author Dr Blanc-Lapierre said: 'The association between perceived workplace psychological stress - over the entire work career - and cancer among men has never been assessed.
'Prolonged exposure to perceived stress at work was associated with greater odds of cancer at five out of eleven sites.
'While over reporting of stress by cases cannot be fully ruled out, these associations, if substantiated, would bear important public health significance.'
But the researchers said the results don't prove anything yet, and are based on a summary assessment of specific jobs.
They say further research is needed to create reliable stress measurements that take all sources into account.
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