Symptoms of low electrolytes can usually be easily spotted. You may feel weak, a twitching sensation, confusion, seizures, numbness, and irregular heartbeats. There could be a difference in blood pressure. The most common electrolyte imbalance is hyponatremia resulting from low sodium concentration in the blood. (8) Confusion, edema, and rales (an abnormal rattling sound from the lungs, heard with a stethoscope) are the most frequent findings in physical examinations by a doctor.