panic attacks cause a great amount of catecholamines such as adrenaline to be release to the blood stream.-
catecholamines cause the blood vessels to contract reducing the amount blood that goes thrwu them per time, which leads to less blood getting to your heart, and when your heart muscle gets less blood it suffers, causing the chest pain.-
also whem you’re scared your heart beats faster, needing more blood to deliver the oxigen to do it, so the demands are higher at that moment, all this things added it’s like a vicious circle.-

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