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

Anything can trigger an anxiety or panic attack. It could be your surroundings, your thoughts, what someone said, etc..

Remembering a situation in the past and keep thinking of what have could been can triggers anxiety easily

Your thoughts might trigger the anxiety and panic attacks, one thought alone can set you off, I know it sounds terrible, but there’s various methods you can use to stop a panic attack, for example, grounding.

Cutting or other suicidal actions on the arms, legs, or other body parts. This makes me uncomfortable and triggers me

Numerous possibilities. First, I recommend a doctor visit. Also, there are things such as diet and sleep issues that can impact mood. You also may have some issues that you are suppressing that you may need to talk out with someone. Most importantly - don't freak out over it. It's actually fairly common. : )

Too much noise on a room or just too much stimuli. Also being in a place which is crowded by people

For me, my anxiety can be triggered by merely thinking about the possible outcomes of some of my decisions. Did I make the right choice? Should I've done something different? But then I just think, it's no longer in my control. If I can't do anything about it, I have no reason to worry about it. Obviously, that doesn't always work, but it does most of the time. For the times it doesn't work, I just take a few deep breaths and think about what good has come of my decisions and what good can come of them.

Anxiety attacks can be triggered by a lot of things, there is never ‘nothing going on’ and I think the most important thing is to practise grounding techniques and other self help methods in order to calm yourself enough to seek either professional help, help from peers, or talking to a listener on 7 cups

Anything does, being around crowds of people and feeling stuck in one place, but everyone is different

The best place to start is with the invisible triggers of anxiety. Invisible triggers are possible triggers that you may not even know is happening. A great example is clutter. Some people (not all) start to experience much more anxiety when their homes have more clutter because they associated cleanliness with control. That's an invisible anxiety trigger, because the person may not even be aware that their home is affecting them until it's cleaned. Other invisible triggers include: Too Much Time to Think Lack of Goal Setting Health and News Loss of Coping Anxious Thoughts Panic attacks are so unusual that they can be caused by fear of panic attacks - or simply by thinking about your panic attacks. They can be caused by exercise, by dehydration, and by nothing at all. The first panic attack often comes at a time of considerable stress, but some people have been known to get their first panic attack for no apparent reason. Once that first panic attack occurs, common triggers include:Chest pains. Lightheadedness, Heart palpitations (rapid heartbeat that you can feel)Trouble taking a deep breath. Oversensitivity to physical sensations. Health fears