Shock

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Shock is a circulatory failure resulting in inadequate organ perfusion - basically, if you're not getting enough oxygen to the important bits and pieces, you're probably in shock. There are lots of different causes of shock but broadly speaking there are two categories. Essentially, there are four important types of shock:

There are other types of shock but these are much rarer. Endocrine failure due to Addison's disease or hypothyroidism. Neurogenic and iatrogenic shock (in anaesthetics and with antihypertensives) can also occur.