Anxiety is an activation of the body to physical and psychological level in response to a threat.

A body level it can manifest with different symptoms such as tachycardia, shortness of breath, stiffness / weakness, agitation / motor block (eg tremors in the extremities), excessive sweating, dizziness, inomnio, etc.

Psychologically various unpleasant sensations more or less intense and diffuse, such as anxiety, fear, worry, desire to flee, feeling of loss of control, and recurrent negative thoughts, they experienced etc.

There are different types of anxiety disorders such as phobias, panic attacks, obsessive disorders, posttraumatic stress disorder, generalized anxiety disorder, etc.