Studies have found that psychological stress interferes with the body's ability to control inflammation, which heightens the chances of disease. Emotional stress can trigger the body to produce the stress hormone, cortisol, which plays a role in the initiation of inflammation. Cortisol is considered a fight or flight hormone. When you are stressed, your body produces cortisol. Likewise, during that time you have a potential risk of infection due to the causative agent of stress. However, your body will resolve the agent provoking the fight or flight response without harming your body. Since the hormone is no longer needed, inflammation can set in. This notion is evident by the fact that people who are stressed are often more susceptible to the common cold.
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