What is anxiety i hear it has something to do with the heart?

Question

im not sure what it is but i think my friend has it

Answer 1

it's a sort of state of fear in which the body prepares as if to deal with something "dangerous", even when there is nothing dangerous to deal with.

you should read the wikipedia article

http://en.wikipedia.org/wiki/Anxiety

Answer 2

it is the reaction your body and mind have to different situations. like some ppl get anxiety being around crowds while others have it driving a car etc. everyday situations are different for each person