Think through situations in your life where everything is going pretty well and then all of a sudden you just kind of lose it. Or you may feel the pressure to lose it mounting, getting bigger and bigger until you can't take it anymore and just burst with what is considered over emotional responses. Your triggers are personal, but we all have some basic similarities. With BPD the fear of being abandoned usually is a BIG trigger. It doesn't have to be even real, you could just sense that someone is looking to leave you and it can "trigger" a reaction that the person in question can't even begin to understand. And it doesn't even have to be a partner. It could be a co-worker leaving the job and all of a sudden you go into hyper-panic mode and lash out. It makes little sense to someone without BPD, but when you're talking to another person with the illness you'll start to notice we can all pretty much relate.
You'll learn as you go. Pay attention to what's going on in your life enough so that when you have an episode you can look back and realize what was going on, what was stressing you or overwhelming you. After a while, when you see those same things starting to happen you can take a break, walk away, get some space from it and prepare yourself better to handle it.
When people say that a post or whatever has possible triggers, it basically just means that reading it might make you relate so closely to what the poster is saying that it conquers ups your own emotional response and that you may need to either better prepare yourself before reading or, if its a particular crazy time or sensitive subject, just avoid the post altogether. We say it merely as a courtesy to each other.
It's a hard life until you learn that you are able to control things better than you have. But the best lesson you can learn is that everything takes time and no one is perfect. Get the people in your life who you trust to learn about the illness and make it a project everyone is involved with. But don't push for miracles. Step by step is pretty amazing enough.
* it's a rainbow. i only have one crayon. *
Bi-Polar Type I, Borderline Personality Disorder
300mg Seroquel XR, 800 mg Tegretol