Which of the following is a common symptom of hypokalemia?

A weak irregular pulse is a common symptom of hypokalemia, which is a condition characterized by low levels of potassium in the blood. Potassium plays a critical role in muscle function, including the heart, as it is essential for maintaining the electrical activity of cells. When potassium levels drop, it can lead to alterations in cardiac conduction, manifesting as changes in the heart rate and rhythm. This can result in a weak and irregular pulse, making it a key indicator of hypokalemia.

In contrast, the other options do not specifically correlate with low potassium levels. Increased appetite is not typically associated with hypokalemia; in fact, some individuals may experience a decrease in appetite. Excessive sweating does not directly indicate low potassium, as it can occur for various reasons, such as dehydration or heat exposure. Elevated blood pressure might also occur in different conditions but is not a direct symptom of hypokalemia. Thus, a weak irregular pulse is distinctly linked to the effects of inadequate potassium on heart function.