Anxiety is our bodies way of reacting to situations including stress, worry or uncertainty. It is a natural feeling and every person experiences it at some point of their lives. Small amounts of anxiety can be beneficial to ourselves, as it can help us remain alert and focussed upon particular tasks. However, too much anxiety can affect our ability to cope with its symptoms and can become very unpleasant.
Anxiety includes both physical and mental symptoms. Physical symptoms include tension in the body, trembling hands, faster heartbeat, rapid breathing and feeling sick in the stomach.
Mental symptoms of anxiety include excessive worrying, trouble concentrating and having worries that seem out of proportion. Anxiety is different to stress and worrying, but often occurs during the same time. See below for information regarding the differences between anxiety, stress and worrying.

Worrying and anxiety have similarities, however there are differences which make worrying an important issue to understand. Worrying occurs when we are thinking of what is going to happen in our future. If worrying is strong enough then it can become a form of anxiety.
However there are differences between worry and anxiety. Worry tends to be more specific and associated with a particular event. Whereas anxiety can be across many problems that we face.
Worrying about a particular subject tends to be short lived, whilst anxiety is more likely to a prolonged experience.