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The nervous system senses the stress the body is undergoing and causes an increased production of cortisol along with other hormones. These stimulate the sebaceous glands to release more oil, causing rashes due to the irritation of the skin.
Besides the feeling of nervousness, worry or fear, an anxiety disorder can cause fatigue, irritability, restlessness and lack of concentration. It also manifests physical symptoms, such as sweating, nausea, diarrhea, trembling, shortness of breath and rapid heartbeats.