A nationwide survey by CareerBuilder.com, released Wednesday, of more than 2,500 workers found 77 percent said they feel burnout and more than half said they work under a great deal of stress.
Workers most often blame colleagues for their office anxiety, with 16 percent citing difficult co-workers as their primary cause of stress at work.
Other top workplace stressors include unrealistic workload, tight deadlines, last-minute projects and difficult supervisors.
"High-pressure work environments are taking their toll on workers' morale," said Rosemary Haefner, a CareerBuilder.com vice president.
"Twenty-three percent of workers say they frequently or constantly feel burnout at work. This can be detrimental to both workers, whose health and career progress may suffer, and employers, who pick up the tab in higher insurance costs and lost productivity."