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The term shock is commonly used to mean many different things. Medically it is a state where the circulatory system (heart and blood vessels) fails to provide enough blood and oxygen to your vital organs. There are different causes of shock such as blood loss, heart failure, or dilation of blood vessels. They all result clinically in low BP.
When you are under stress (fight or flight) your body releases catecholamines (commonly known as adrenaline) that do many of different things including increasing your heart rate and blood pressure. Having a release of catecholamines may or may not be a good thing depending on what is causing the shock. If you are shot and have lost a lot of blood it is a good thing because it helps increase oxygen delivery to your vital organs. However if you are in heart failure and your blood pressure is up because of a stressor that just makes it more difficult for the heart to pump and results in less perfusion. Clear as mud?
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