Regardless of position, industry or size of paycheck, I highly doubt anyone's thrilled to go to work every single day—even if you're generally happy to be at the office. You might love your job, or think your boss is the greatest, or truly believe in your mission, but those feelings won't always be immutable. There are telltale signs that you're coming upon a breaking point which, if not managed, can lead to burnout.
One day you're plugging away feeling pretty OK about things, until something small and seemingly insignificant begins to nag at you, and you find yourself unreasonably annoyed and angered.
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If it's a fleeting frustration (again, typical no matter how good you have it), you probably have nothing to worry about. On the other hand, if it lingers, or if every little thing grates at your every nerve, if you struggle to focus on — or, worse, care about — your work, you may be in imminent danger of burnout.