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Ongoing, chronic stress, however, can cause or exacerbate many serious health problems, including: Mental health problems, such as depression, anxiety, and personality disorders. Cardiovascular disease, including heart disease, high blood pressure, abnormal heart rhythms, heart attacks, and stroke.
When you feel threatened, a chemical reaction occurs in your body that allows you to act in a way to prevent injury. This reaction is known as "fight-or-flight,” or the stress response. During a stress response, your heart rate increases, breathing quickens, muscles tighten, and blood pressure rises.