Caught your breath, but heart still racing? When dehydration decreases the volume of blood in your body, your heart speeds up as it attempts to pump out the same amount of blood it would if you were properly hydrated. (In other words, when you’re dehydrated, your heart's hard at work maintaining your blood pressure.) If you’re extremely dehydrated and your heart really gets going (say, above 100 beats per minute), you may experience palpitations, which are essentially hiccups in your heart’s rhythm.
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