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Symptoms of Anxiety. Symptoms of Anxiety: Introduction. The symptoms of anxiety are due to the body's reaction to stress called the fright, fight or flight response. This reaction developed in early human evolution as a means to increase alertness and readiness to react to dangerous stressors, such as the threat of a man-eating predator.
There are several recognized types of anxiety disorders, including: 1  Panic disorder: People with this condition have feelings of terror that strike suddenly and repeatedly with no warning.ymptoms vary depending on the type of anxiety disorder, but general symptoms include: 1  Feelings of panic, fear, and uneasiness. 2  Problems sleeping. 3  Cold or sweaty hands and/or feet. 4  Shortness of breath. 5  Heart palpitations.