What can happen when you go from relaxing in a hot tub to suddenly standing up? The heat causes your blood vessels to dilate, which can make your blood pressure drop. If you stand up too quickly, the lack of blood flow to your brain can make you faint. The best thing to do is sit down, hydrate, and cool off if you start to feel faint. And if someone passes out, lay them flat with their legs up - don’t try to stand them up, as that will only make the problem worse.
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