The symptoms we experience with anxiety are real symptoms but they are not due to a real physical illness. Take a minute to think what happens to your body when you’re having a panic/anxiety attack; it is in fear response mode.
If you were in some kind of danger you would need to act quickly to defend yourself, that’s why we have a built in fight-or-flight response that our body activates once we feel any type of threat.When the body is very anxious the nervous system gives a signal to release certain hormones, (adrenaline and cortisol).
When these are produced in the body, the heart-rate is stimulated, air passages and blood vessels dilate, as well as a number of more minor effects.
Read more on nopanic.org.uk