To get a sense of the most stressful jobs in America, CareerCast.com looked at 21 different factors that can cause stress on the job, and ranked 200 professions by how significantly these demands factor into the average workday. Factors that weighed into stress levels included work environment, job competitiveness, opportunity for advancement and even perceived risk of unemployment.

CareerCast has also included a range of unemployment each profession faces around the country, a number which contributes to perceived risk of unemployment.

Here are the most stressful jobs in America:

1. Firefighter

Stress Rank: 200
Stress Score: 110.936
Unemployment: 0%-4%
Hours Per Day: 11
Time Pressure: Very High
Competition: Low

"Firefighters frequently work irregular or unusual hours, or remain on call throughout the night. They risk heat exhaustion, smoke inhalation, and serious injury while on the job, and even the state of anticipation preceding a major threat can be highly stressful in itself. Firefighters are also sometimes required to spend long hours outdoors in bad weather," says CareerCast.com.

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