Can a potassium deficiency give you lef cramps?

Yes: Low potassium levels (known as hypokalemia) can often cause muscle weakness and cramps. Low potassium levels can occur after heavy exercise through poassium losses in sweat. This is why many sports drinks are fortified with potassium and athletes often eat foods rich in potassium in matches (for example, bananas).

Yes: As can deficiencies in calcium and magnesium. These are common effects in patients on diuretics.