Anxiety is an unpleasant emotional state ranging from mild unease to intense fear. Anxiety is often accompanied by a variety of symptoms relate to the chest, such as heart palpitation, throbbing or stabbing pains. A feeling of tightness and inability to take in enough air and a tendency to hyperventilate. Tension in the muscles of the back and neck often leads to headache, back pains, and muscle spasms. Other symptoms can include excessive sweating, dryness of mouth, dizziness, digestive disturbances, and the constant desire to urinate. Anxious individuals usually have fear that they have a chronic serious illness. Clinical anxiety, including panic attacks, can be produced as side effect of unsuited drugs. The most significant biochemical disturbance is noted in people with anxiety and panic indications, i.e. elevated blood lactate level.