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Hyperkalemia, which is an elevated level of potassium in the blood, typically presents a range of symptoms related to the muscular and cardiac systems. Muscle weakness often occurs due to increased potassium levels affecting the contractility of muscle fibers. This can result in fatigue and difficulty in muscle function.

Paraesthesias of the face can also be a symptom of hyperkalemia. Elevated potassium levels may lead to neuromuscular irritability and altered sensory responses, resulting in tingling or numb sensations. Similarly, a slow heart rate, or bradycardia, is another common cardiovascular manifestation of hyperkalemia, as high potassium levels can disrupt the electrical conduction system of the heart.

In contrast, a severe headache is not typically linked with hyperkalemia. While headaches can result from various conditions, they are more related to systemic issues such as hypertension, dehydration, or other neurological causes. Therefore, the presence of a severe headache does not align with the commonly recognized symptoms of hyperkalemia, making it the correct answer to identify the symptom that is not associated with this condition.