Potassium is an electrolyte that facilitates electrical communication between cells, and also helps maintain vital functions such as blood pressure, nerve function and the health of cell membranes. MayoClinic.com states that normal levels of potassium in the bloodstream range from 3.6 to 4.8 mEq/L, or milliequivalents per liter. Too much potassium, a condition called hyperkalemia, is defined as blood potassium levels higher than 6 mEq/L, and can compromise your health, sometimes in very serious ways.
Altered Sensation
The Linus Pauling Institute explains that hyperkalemia can produce tingling and numbness in your extremities, as well as more widespread muscle weakness. Recommended daily allowances for potassium, either through diet or supplements, range from 400 to 4,700 mg, depending on you age. Women who are breastfeeding generally need to increase their intake to 5,100 mg per day.
Heart Arrhythmias
MayoClinic.com lists heart arrhythmias as one of the dangers of too much potassium. An arrhythmia is an abnormal beating pattern of the heart, which can become very serious and even fatal if not addressed. The Linus Pauling Institute states that cardiac arrhythmia is the most serious side effect of hyperkalemia because it can lead to cardiac arrest.
Kidney Failure
Periodic Paralysis International, an organization devoted to distributing information about periodic paralysis, explains that your kidneys manage your potassium and filter out any excesses to be excreted in urine. When potassium levels become very high, especially in people who already have compromised kidney function, the organs aren't able to process the mineral effectively and it remains stored in the kidneys, which may result in kidney failure.
Paralysis
A December 1999 issue of "Discover" reports that paralysis can occur at either end of the spectrum in regard to potassium; in cases of low potassium, called hypokalemia, as well as high concentrations of the electrolyte. The Linus Pauling Institute explains that high potassium levels can affect the muscles in an extreme fashion, leading to paralysis of the intestinal tract and the body as well.
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