Which sign or symptom is indicative of hypokalemia?

Muscle weakness is a classic sign of hypokalemia, or low potassium levels in the blood. Potassium plays a crucial role in the normal functioning of muscles and nerves. When potassium levels drop, muscle cells may not be able to function properly, resulting in weakness and fatigue. This can affect both skeletal muscles, leading to a general feeling of weakness, and smooth muscles, which can impact respiratory function and gastrointestinal motility.

While nausea, seizures, and increased heart rate can also suggest other medical conditions, they are not specific indicators of hypokalemia. Nausea might arise from various gastrointestinal issues, seizures can be associated with a range of neurological disorders, and an increased heart rate may indicate stress, dehydration, or other cardiac concerns. Thus, muscle weakness is more closely associated with the deficiency of potassium, making it the most indicative sign of hypokalemia among the listed options.