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Anxiety is a psychological and physiological state characterized by cognitive, somatic, emotional, and behavioral components. These components combine to create the painful feelings that we typically recognize as anger, fear, apprehension, or worry.
Anxiety is often accompanied by physical sensations such as heart palpitations, nausea, chest pain, shortness of breath, stomach aches, or headache. The cognitive component entails expectation of a diffuse and certain danger.
The symptoms of Anxiety disorder are blood pressure, sweating is increased, blood flow to the major muscle groups is increased, and immune and digestive system functions are inhibited.
Externally, anxiety may include pale skin, sweating, trembling, and pupillary dilation. Emotionally, anxiety causes a sense of dread or panic and physically causes nausea, diarrhea, and chills. Behaviorally, both voluntary and involuntary behaviors may arise directed at escaping or avoiding the source of anxiety and often maladaptive, being most extreme in anxiety disorders.