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Muscle weakness is a common symptom that may indicate hyperkalemia, particularly in patients who are taking potassium supplements. When potassium levels in the blood become elevated, it can disrupt normal neuromuscular function. This disruption can lead to generalized muscle weakness, fatigue, and even respiratory difficulties in severe cases. The muscle cells become less excitable due to high potassium levels, which impacts their ability to contract effectively.

While fatigue can also be a symptom of hyperkalemia, muscle weakness is more directly associated with the effects of elevated potassium on muscle function. Other options such as joint pain and headaches are less specific indicators of hyperkalemia and can be attributed to a wide range of other health issues. Hence, muscle weakness stands out as a key indicator that clinicians should monitor for in patients receiving potassium supplements.