5. Your Boss

Bullying in the workplace is surprisingly common, said NYT. Instead of physical bullying, office bullies practise subtle tactics.

It may start with with a belittling comment at a staff meeting. Later it becomes gossip to co-workers and forgetting to invite someone to an important work event, continued the report.

If the bully is a supervisor, victims may be stripped of critical duties, then accused of not doing their job, Gary Namie, founder of the Workplace Bullying Institute, told the NYT.

Researchers at the University of Manitoba in Canada have found that the emotional stress from being bullied at work is more severe than that of sexual harassment.

A good strategy for fighting off the office bully would be to alert your superiors. If you can join forces with other affected colleagues and complain as a group, you're twice as likely to succeed, said Newsweek online.

However, if it doesn't work and if the bad moments outnumber the good, the best health choice may be to start working on your resume, added the report.