Stress
If you're looking to zen-out and avoid stress in life, then a career in broadcast journalism probably isn't for you.
The tragedies you report on will stress you out, as will concern for the families you encounter who've been affected by those tragedies. Your hours will be erratic, and that's stressful too. Then there's the constant pressure to get the facts right. And on top of all that, you'll be the one in front of the camera every time, so you have to deal with the added stress of being seen by hundreds, or thousands (or your more standard viewership of eight or twelve concerned citizens).
If the thought of all that gives you a queasy, stomach-knotty feeling, then this is the time to consider a different career. The easily shaken need not apply.
Of course, there are proven ways of managing the stress that attends to this profession. If the thrill of reporting from the front lines still appeals to you despite the constant stressors, you'll just need to figure out the combination of spa visits, tropical vacations, and Netflix marathons that best keeps you calm and collected for the camera.