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'''Stress''' is the emotional and physical tension brought on a person’s reaction to the demands of life. Stress frequently causes anxiety, irritability, and inability to concentrate. Stress can also lead to headaches, and a rapid heartbeat.
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'''Stress''' is the emotional and physical tension brought on a person’s reaction to the demands of life. Stress frequently causes anxiety, irritability, and inability to concentrate. Stress can also lead to headaches, and a rapid heartbeat.<ref>http://ghr.nlm.nih.gov/ghr/glossary/stress</ref>
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==References==
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<references/>

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