Write It Down

It's never easy for me to pin point my triggers. Sometimes it's easier to say I don't know but that doesn't help you in the long run. Instead, I find it helpful to write it down. Whether you're having a panic attack, an episode of self injury, mood swings, or anxiety you should write down what happened can be a big help in finding your triggers. Documenting the details of before, during, and after your episode on a daily basis or however often they occur can help you identify your triggers.
After writing down a few details from my episodes I was able to see that some of my triggers for self injury are stress and being alone for long periods of time. Now when I feel myself getting stressed I can try to stop myself before I turn to self injury. When I know I'm going to be alone I try to arrange to go home for the weekend or see my friends for a night. It takes time to find your triggers so give it a chance to work and you'll be surprised.
You can record your information in a notebook or online at https://www.facingus.org/ it's a really great site I use it all the time. One of my professors showed it to me and I highly recommend it to everyone.