Sometimes people push your buttons, whether it's kids, family, coworkers. And when they do you're feeling the edge of a boundary.
Remember boundaries as a kid? Your parent said you could go as far as this driveway or that tree, but no further. As adults we don't always pay attention to boundaries the same way.
When you hit up against something that feels uncomfortable it can cause growth, or it can be a signal that you are being pushed into something you don't want to do.
And it can be anything - babysit someone's kid when you don't want to, cover a coworker's project when you're already drowning in work, someone telling you how you should be living your life.
So what do you do? Do you cave? Or do you resist? By and large it will depend on the circumstance, but it helps you to be aware of what you do and why.
The next time someone pushes your buttons see what boundary it's closing in on and be mindful of your reaction to it.