Hypernatremia is characterised by having an excess of which element in the body?

TestyAlien3443, and Sodium's "Na" is short for Natrium

I hesitated a few seconds until I remembered Na stands for sodium

Many African Americans have an inherited condition called hyperaldosteronemia that causes the body to retain sodium and fluids and thus causes high blood pressure.

“Hyper” = too much “Natremia” ≈ sodium concentration (sodium being Na on the periodic table) Much like hyperkalemia is too much potassium (K) in the blood.