The cause of anxiety may be a biological predisposition. This is a big research area right now with a lot of questions still unanswered.
We often see people who are anxious because they have a great deal of stress in their everyday lives. Some of the reasons go back to family relationships when they were growing up.
Whatever the reason, they’re stuck in a battle with their anxieties and they are not making progress in changing the causes they need to reach the cause and alter the behavior. Sometimes they can make changes without finding reasons, but more often they need to.