Your job might be killing you—literally. More specifically, strained relationships with co-workers could be negatively impacting your health and longevity. That's the conclusion of a 20-year study conducted by researchers at Tel Aviv University. They examined the relationship between the workplace and a person's risk of death. In 1988 the researchers recruited 820 adults and asked them detailed questions about their workplace conditions. At the start of the study the participants ranged in age from 25 to 65 and they worked in a variety of careers.

For the next 20 years the researchers tracked the participants. By 2008, 53 of the workers had died. The study found that those who died were significantly more likely to have reported a hostile work environment. Surprisingly, the greatest source of stress came from the employees' co-workers, not their bosses. The workers who reported little or no social support from their co-workers were 2.4 times more likely to die during the 20-year study than those who said they had supportive bonds with their co-workers. The article concluded that the findings "add evidence that having a supportive social network decreases stress and helps foster good health."

Unfortunately, the same article noted another 2011 survey that provided evidence that workplaces are becoming less supportive and less civil. The American Psychology Association study found that 86 percent of nearly 300 workers surveyed reported incivility at their job, including rudeness, bad manners, and insults.