Office politics don't bother me much, although I do realize they're pretty bad in some places.
My stress comes from the desire for my company to have an "efficient" staff - meaning, they want as few people as possible to do all of the necessary day to day work. Which actually backfires on them, because we are too busy to get everything done with the necessary effort, and so everything gets done half-assed and we
still can't finish it all. (Then they wonder why our numbers are bad?) And then, to top it off, we were expected to "just deal with it" for several years. They are just now figuring out that they need to appreciate their employees and are working on a plan to make our department more specialized rather than generalized, so everyone isn't trying to do a half-assed job at everything. In the mean time they keep piling more work on us. Is this unique to my company? No! Corporations for the lose.
I also really hate the American work system. Little to no time off for vacation at most places, even big corporations (two weeks of vacation a year is "good" here to start off with, and it only moves to 3 weeks after 5 years). We get a rushed one hour lunch that doesn't even feel like a break, and because of the previous situation mentioned in the above paragraph, most people feel they need to skip lunch or eat at their desks in order to finish their jobs, as well as stay late during the week and even come in on weekends. Then, if we get sick, we feel so guilty about not being at work or feel like no one will cover for us that we will come to work sick or feel absolutely horrible for calling in. There are a lot of people at my work who haven't called in sick for so long they've hit the cap for acrued sick time. There are also lots of people who never take their vacations and are capped on that, too.
Both of those things combined really burns me out sometimes. And no, I'm not going to say what company I work for.
Then there are some seasonal things... year end is pretty stressful since we try to get everything cleaned up, and the workload is known to double or triple during that time. There are others but I can't mention them without giving away the name of the company I work for.
Managers drive me nuts too. You guys know this one - you know exactly how much effort you put in a day, and you know what your coworkers are doing, too. You know who the slackers are, you know who the overachievers are... and your manager is completely oblivious to it all. The slacker does minimal effort and goofs off for half the day (and NEVER gets caught), while the overachiever, who gets their work done early, might get caught doing something like browsing the internet during a 15 min break and gets in trouble for it. To top it off, the manager doesn't know what your daily grind is, and when you try to explain it their eyes glaze over and they have no idea what your talking about. They just nod and smile. Me, speaking from personal experience? Nevar!
Hope that helps!
(There are a lot of good things about my work, but you just wanted the stressful stuff, so I gave it to ya!)