My PD slips out in different ways for different reasons. Some expressions have a definitive trigger but there are others that still seems to come out of the blue. There may well be a trigger, but I haven't figured it out yet.

When I'm doing well - eating and sleeping regularly, taking my meds and doing my therapy stuff - I have far fewer outbreaks. When I get off-track with that stuff, it's much easier for me to flare up. The more off-balance I am, the more i react and the more off-balance I get, so I react more and get further off-balance...nasty little spin cycle there.

It can be hard to pick up on my triggers. I can get set off by things that a "normal" person wouldn't even notice. Fear of abandonment is a classic trigger, but i can feel "abandoned" by something as simple as you running up to the store without saying anything to me about it. Heck - even if you DO tell me you're running to the store - if you aren't home in a "reasonable" amount of time, I can think that you've already left me. My BF noticed when we started dating that I would follow him from room to room. Some of that (for me) was a "fear" that he wouldn't come back. That's an "object constancy" thing - if you aren't right here in front of me, then you weren't real to begin with.

Even to the same trigger, my reaction can vary from day to day. One day, I'll be angry. Another day, I'll be scared and crying. Another day, I won't even notice. The next day I'll be all sweet trying to make it up to you. After that I'll blow up some more. All valid responses, all genuine! But different responses depending on how the triggers hit me.

No, this doesn't make any sense. I can tell you about it and see how crazy this sounds, but this IS how my brain can work.
Abandonment is big.
Betrayal/dishonesty is big.
Attempts to control me are big.
Indifference can be big.
It's all about which threat my brain perceives today.