Which of the following can cause hyponatremia?

Hyponatremia is characterized by low sodium levels in the blood, and dehydration is a condition that can lead to this electrolyte imbalance. When the body is dehydrated, it conserves water and can become overloaded with fluids, diluting sodium levels in the bloodstream. This dilution effect can decrease the concentration of sodium, resulting in hyponatremia.

In contrast, while increased potassium intake, hypercalcemia, and hypoglycemia can impact various physiological processes, they do not directly cause a decrease in sodium levels in the blood. Increased potassium intake primarily affects potassium levels and does not directly dilute sodium. Hypercalcemia involves elevated calcium levels but does not inherently alter sodium concentration. Hypoglycemia relates to low blood sugar levels and also does not significantly influence sodium levels, thus making dehydration the most relevant cause of hyponatremia among the provided options.