Everyone has bad days at work, but there are signs that employees need to watch out for before a bad week at the office turns into never-ending, debilitating work stress that is ruining your health.

Too many Americans are trapped in toxic jobs, a problem employers and employees need to take more seriously. Jeffrey Pfeffer, an organizational behavior professor at Stanford who wrote the book Dying for a Paycheck, found through his research that poor management in U.S. companies accounted for up to 8 percent of annual health costs and was associated with 120,000 excess deaths every year.