And psychologists are reporting a new phenomenon of "desk rage" with workers resorting to stand-up rows with their colleagues because of the pressure they face.
An ICM survey of more than 600 workers in England found that 64% felt they were affected by workplace stress.
Fifty-six per cent said they lost sleep as a result, 26% had fallen ill and 28% had had a stand-up row with a colleague.
Men were more likely to shout at their colleagues - 16% said they had done so, compared to 9% of women.
But women were more likely to admit to breaking down and crying because of stress.
Workload was the main reason for stress, followed by pressure to meet targets and deadlines.
Twenty-eight per cent had reached for alcohol to calm their nerves, and one in three turned to cigarettes.
Lunch hour dying out
Thirty per cent of women and 15% of men said chocolate helped them beat stress.
The survey also showed that many workers are skipping lunch to get more work done. Under a fifth always take a lunchbreak, with 92% of people in the Midlands missing out.
Psychologist Sue Keane of the British Psychological Society urged workers to find time for a break.
She said: "We have had road rage. Now we are seeing desk rage as stress builds to intolerable levels and conflicts boil over between colleagues.
"Just a few minutes out of the office or workplace at lunchtime could make all the difference."
It is estimated that 40 million working days are lost in the UK every year because of stress.
Studies suggest the advent of call centres, mobile phones and emails have only helped to increase pressure.
Background Briefings
Medical notes
Long hours 'do damage your health'
(02 Sep 99 | Health)
Stress at work: the pros and cons
(13 Apr 99 | Medical notes)
Campaign to boost women workers' health
(25 Aug 99 | Health)
Poor health blamed on work insecurity
(23 Aug 99 | Health)
Pregnant women face work pressure
(18 Aug 99 | Health)
Health and Safety Executive
Department of Health
Stress at work research
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