What happens if you inject water with nothing in it?

Answer 1

Not a good idea.

Your blood is isotonic, which means it contains a certain level of electrolytes including sodium, potassium, chlorine, magnesium, calcium, etc..Injecting pure water without any electrolytes, especially sodium chloride, causes a hypotonic condition. The water will be absorbed rapidly into the red and white blood cells, causing them to rupture (water is drawn into the more hypertonic cell). These ruptured cells will cause blockages in your kidneys, causing renal failure, and can cause a stroke as they block capillaries in your brain.The extent of the damage depends on the amount of water injected. Although you could a transient fever from pyrogens in unsterile, pyrogen free water, you could also get a septicemia (blood infection) from unfiltered Bacteria.All in all, a bad idea.