This is my standard line I give to people who are interested in EMS:
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EMS is a terrible, horrible, no good, very bad job.
It's long hours, low pay, high stress, low recognition and you'll see things you wish you could unsee. That being said, if you're the right kind of crazy, it's the best job in the world.
EMS is not what you think it is, every once in a while, we go out to horrible car crashes and try to patch people up long enough to get them to the hospital, and every once in a while, we do CPR and shove tubes and drugs into someone who had a heart attack...much more often, though, we go pick up a little old lady who fell down and broke her hip, or a guy who's having a particularly bad asthma attack, or a young woman who's having a panic attack. While we may do some medical interventions for them, much more importantly, what we do is be nice to them, and calm for them, and we take them to the people who can really help. We do make a difference for those people, and if you can be happy making that difference, then this might be the job for you, if you need to be saving lives every day, then you might want to look elsewhere.
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As others have said, the job really isn't dangerous. It's certainly is more dangerous than working as a mechanical engineer, but I'd say it's less dangerous than working as a gas station attendant. When we go out to a call that might be dangerous, we park half a mile away and wait for the cops to tell us it's safe. Probably the most dangerous thing we do on any sort of regular basis is walk around on the side of the road.