What is a common symptom of electrolyte imbalance?

Muscle weakness or cramping is a common symptom of electrolyte imbalance because electrolytes, such as potassium, sodium, calcium, and magnesium, play essential roles in muscle function and nerve conduction. When there is an imbalance—whether too much or too little of these electrolytes—it can disrupt normal muscle contraction and signaling, leading to symptoms such as weakness, cramping, and spasms. For example, low potassium levels (hypokalemia) can cause significant muscle weakness and cramping, while low calcium can lead to muscle spasms known as tetany.

In contrast, the other options do not directly relate to electrolyte imbalances as common symptoms. Increased appetite is generally not associated with electrolyte issues. Frequent headaches could arise from various causes, but they are not a primary symptom of electrolyte imbalances. Shortness of breath can occur with severe imbalances but is not considered a common or direct symptom compared to muscle-related issues. Thus, muscle weakness or cramping stands out as a clear and direct manifestation of electrolyte disturbances.