Mainly anxiety - and the triggers can vary, and even be unconscious. Other than that, I know little about them.
Stress,Anxiety,and Chemical Imbalances in the brain causing your adrenal gland to produce more adrenalin.
Usually they're brought on by a condition called Agoraphobia (Fear of Open Spaces)
I've have them frequently because I inherited them from my mother's side of the family. I've been on meds for them.
talking to cute guys, i stop breathing a for a few seconds. sadly true story
idk where they come from. Most times it's just out of no where and the more you think about them, the worse they get. I believe if no one had ever given me a name for them I may have ignored them and been able to move on, seems the moment someone said "it's an anxiety attack/panic attack........ that's when I was ruined forever. I hope you find a solution.
You may have a chemical imbalance in your brain . Sometimes they can go away, but you may need meds. In my case I had to deal with it for almost four years. Stress can cause them or can cause the imbalance. Sometimes things can get worse , like slipping into a deeper depression , even if you dont feel depressed. The winter months are always the worst for most people .Good luck
I have panic attacks because my brain reacts to stimuli way, way out of proportion. Little things remind me of big, bad, scary things. The association sends me into a tizzy.
But I don't know why you have them. They do self-perpetuate, though.
There are numerous reasons why they can happen. Stress is a big reason why I get them.