Abnormally low levels of potassium in the blood, typically below 3.5 mEq/L. Can cause muscle weakness, fatigue, heart rhythm problems, and in severe cases, paralysis.
From Greek 'hypo' (under/below), Arabic 'al qali' (plant ashes), and Greek 'haima' (blood). Recognition of this condition became important with the widespread use of diuretics in the mid-20th century, which can dangerously deplete potassium.
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