Which of the following is a common cause of hypokalemia?

Diuretics are indeed a common cause of hypokalemia, particularly the loop and thiazide diuretics, which are frequently prescribed for conditions such as hypertension and edema. These medications work by promoting the excretion of sodium and water through the kidneys, but they also lead to the increased loss of potassium. This can result in potassium depletion, as the body may not be able to compensate for the increased loss, especially if dietary intake of potassium is insufficient.

On the other hand, increased dietary potassium would typically help prevent or correct hypokalemia, while excessive fluid intake can dilute serum potassium and may not necessarily cause hypokalemia directly. Hyperaldosteronism, characterized by excess production of aldosterone, can also cause hypokalemia, but it is less common compared to the widespread use of diuretics.