Low potassium, or hypokalemia, is a lower than normal amount of potassium in the blood. You consume potassium through food, and your body needs it for cells to balance fluids. According to MedlinePlus, several factors can cause low potassium levels. These include diuretics, laxatives, diarrhea, vomiting, bulimia, sweating and low magnesium levels.
Heartbeat and Low Potassium
The University of Maryland Medical Center states that low potassium levels may cause irregular heartbeats. Other symptoms of low potassium levels are low energy, weakness and stomach pains. If levels become too low, you may feel lightheaded, have slow heartbeats or even die from your heart stopping. Low potassium levels are usually due to excretion through urine or the intestines rather than not getting enough from food. The condition is serious and needs treatment by a doctor.