Anxiety psychological condition characterized by fear and tension, and high expectations, and anxiety caused by fear of the future, or an expectation of something, or a struggle within oneself between impulses and restrictions that prevent those impulses.
Concern are two types: natural anxiety and anxiety disorder.
Anxiety natural (health), or no meaning to life without him. And if a person has disappeared patients wooden conscience. For example, anxiety which occurs many of the worries of life: study and exams, worries of work and home .. Etc..
Natural concern is: is a vague sense of fear of something vaguely unpleasant concomitant rights.