'Prandial' refers to the consumption of food, and sometimes eating a large meal can cause low blood pressure since the blood flow to the digestive system increases at this time, causing blood vessels to be dilated. This is also known as neurally mediated hypotension or vaso-vagal syncope. Loss of consciousness, concussion and otherwise fainting due to an acute drop in blood pressure can occur due to the brain and the heart not receiving the correct signals from the nervous system, causing blood vessels to become incapable of dilating or constricting to maintain blood pressure. Usage of certain drugs, both prescription and recreational, as well as an underlying medical condition such as heart or liver disease cause the heart and the endocrine system to be affected and thus unable to immediately compensate for the downward movement of the blood when standing up. If a person who is lying or sitting down stands up and the heart is unable to adjust the flow of blood to suit the posture, it can result in a lack of adequate blood supply to the brain causing symptoms of low blood pressure such as dizziness or even loss of consciousness. This kind of drop in blood pressure is also termed orthostatic hypotension and is diagnosed if there is an abnormal lowering of blood pressure when standing up suddenly.
Hypotension is classified into a few major types, and these may entail different low blood pressure treatments by doctors.
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