What triggers random anxiety and panic attacks when nothing is going on?

It's mainly through your thoughts or just thinking that there should be something going on that you forgot, even when you are constantly reminded. I always feel the need to be productive and always doing something, and if I'm not, I get really anxious. It just happens.

Sometimes they are triggered when I am going to travel. Other times they come on for no reason at all

triggers can come out of nowhere. I could be looking at someone having fun and be like how are they having so much fun. I could think of my favorite show and start crying because episodes didn't come out. I have lots of existential panic attacks a lot. thinking about life could make me start crying. So i try to just have fun so i don't cry during school.

Chemical inbalance, loud noises and sudden stressful thoughts. Sudden, extreme life changes. Sometimes I can't tell at all.

Sometimes anxiety attacks can be triggered by smell, a sound or even a color. When you are already stressed you are more prone to have a panic attack.

Thoughts about being anxious / having a panic attack and being unable to control it. Thoughts of a future event that might have a negative outcome.

your thoughts. they are pulling the trigger and opening the door to overthinking, which leads to anxiety and panic attack, and also develop your fantasy. you start imagining things that will never happen out of nowhere and it stresses you out and makes you worried, even tho it's unimportant, you get worried and those worries can lead to panic and paranoia as well.

Personally, I may get an anxiety attack when there is noting really happening around me but a thought or many thoughts pop into my head. However, I imagine 'nothing going on' also means cognitively. Random panic attacks can be due to genetic predisposition, early childhood anxiety, persistent stress over a length of time, are all a few invisible, unavoidable factors. Then if you're thinking about stuff, or was thinking about something earlier that was stressful, you may get a panic attack. Too much alone time with your thoughts can bring on attacks, but even a lack of goals in life, no matter how small, can trigger the fight/flight response because you need those emotions to cope with relieving stressors.

The nature of anxiety is that it is not always connected to something that is currently happening that's why it is hard to deal with it.

Literally ANYTHING can trigger anxiety and panic attacks! I didn't realize this for so long, but sites, smells, and everything else can trigger anxiety!