system
Given the following post, respond as if you're commenting on Reddit:
human
Does dehydration cause high or low blood pressure?

 Hi! I’m trying to become wiser on dehydration and its consequences. I keep reading different articles that say contradictory things about dehydration and blood pressure. So, does it cause high or low blood pressure?
gpt
When you're dehydrated, your body will try anything to hold on to the water it already has. it for example releases a chemical which makes your kidneys hold on to water, to prevent you from loosing more water. Something that CAN happen during dehydration is also that your blood vessels constrict, making the pressure at which the blood is pumped higher.

However, when you're extremely dehydrated, the volume of blood you have will decrease, which in turn also decreases your blood pressure. If you are this dehydrated however, your organs are not recieving enough oxygen and they will begin to shut down.