It's no surprise to anybody that some jobs are more stressful than others. But while lots of positions might have you biting your nails, grinding your teeth or eyeing the clock with disturbing regularity, some jobs really have others topped as a source of major stress in life.

According to Careercast.com, there are 10 jobs out of a field of 200 that it evaluated that win (if one can call it that) the competition for most stressful jobs in 2017. In its most recent jobs rated report — something it's issued for close to 30 years — it once again has reviewed positions for what it calls the key criteria of income, growth outlook, work environment and stress.

Over the course of those decades, it points out, there have been dramatic changes in the labor market. In some cases, this has been a good thing — for instance, the rise in demand for careers in mathematics, which has boosted such numbers-specific jobs as mathematician, statistician and data scientist but also given rise to opportunities in health care, business, marketing and "even entertainment."