Is it possible to have a bout of anxiety with out no trigger at all? Just out of the blue BAM anxiety?

Any radical change in demeanor is triggered by something, even if it's not immediately discernible, like a chemical imbalance or a matter within the subconscious.

Nice post..helpful for me.

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Omg yes! It's happened to me without any warning.

Certainly!  Any number of things can bring it on, including chemical and hormonal imbalances.  I struggled with anxiety and panic attacks for a time several years ago.

Yes

Takes very little to trigger one.

Absolutely!  And it can be caused by lots of things (see The Z's answer).

It can also be simply a brain chemistry imbalance which is easily treated if it is a long term problem.

This is worth a read:

A panic attack can happen anywhere, at any time. You may feel terrified and overwhelmed, even though you’re not in any danger.

http://www.webmd.com/anxiety-panic/guide/mental-health-panic-disorder#1