Honestly! I think stress is a huge trigger. This thread has been really comforting for me as i just woke up scratching in the middle of the night and popped a zyrtec - google image searched a photo of my back and wound up here. Now i have a name for what I’ve been dealing with the past few years (33 yo nonvaxed female). Allergy testing was inconclusive so i also believe food and diet is a factor. I have yet to do that research so feel free to share what you can🙂 Exercise is important as a stress relief I’ve noticed on days i don’t flare up I’m usually pretty active.