I wrote this as an answer to a post but thought it may help more people if i re1posted.
Anxiety is a feeling of fear, worry or panic whether they be rational or irrational fears.
Everyone feels anxious from time to time, most people have worries and stress in their lives , money, exams, relationships, their job, their health etc etc. Feeling anxious sometimes is normal.
However, when the initial stress has passed, most people will return to normal and carry on with life. The problems starts when the initial stress has passed, but the fear remains or even gets stronger.
What most people can't deal with or sometimes understand, are the physical and emotional symptoms that come with acute or chronic anxiety. They becomes very afraid of their physical symptoms and therefore feel there is something medically wrong with them. Chest pains become a heart attack or heart disease. Inability to take a deep breath becomes lung cancer. Headaches and/or a tight band around their head becomes a brain tumor.
Causes of anxiety are still not completely understood. Some so called experts think it stems from problems in childhood, other think it to do with an individuals brain chemistry and yet others think it's to do with past stressful or traumatic events.
My anxiety was labelled as being from physical and mental exhaustion when I was hospitalised. I was only in my 20's and did not understand what was happening. I will be 60 soon and I still suffer with some anxiety, but the difference is, I understand it and I can manage it.
Knowledge, understanding and acceptance is the key to overcoming anxiety.