Teaching Can Be Harmful to Your HEALTH !
Of course, accounting, lawyering, writing, business, and carpentry can be harmful, too. But mounting research points to the reality that the school environment combined with requirements and expectations on the job, sets teachers up as vulnerable targets for stress.
It's not true that hard work or long hours automatically translate into stress.
What does translate to stress?
A job in which you are responsible for the welfare of others without the authority or resources to adequately manage that welfare.
A job in which you are responsible for the progress of others, no matter how the "others" participate in efforts to progress.
A job where you are responsible for people rather than a job where you are responsible for things.
A job in which there is not sufficient time to complete tasks assigned.
A job in which you are isolated from colleagues, rather than able to talk easily. 
A job without a career ladder.
A job in which you cannot predict job requirements. 
A job without a system of recognition.
A job that doesn't provide a safe outlet for frustration.
Well, that's just great, you say.
But, here's the good news. While the world outside our skin can be tough, the greatest factor in determining personal stress--is the person.
For starters, think about this one.
"WHICH IS MORE IMPORTANT? THE WORLD YOU CAN TOUCH, OR THE WORLD YOU ARE RESPONDING TO?"
Because the world we can touch, the one that actually exists out there IS NOT THE SAME as the world we make up in our heads and respond to.
Because we're making it up--WE CAN CHANGE the world 
we're responding to.
Pt. 1.2