Hypokalemia means a decrease in the amount of potassium contained in blood. It may be due to excessive losses in the urine or in the digestive tract such as in cases of diarrhea, severe vomiting, or dietary insufficiency ... Medications may also be involved. The symptoms can be cramping or muscle weakness, constipation, increased urination and thirst, and the main complication includes cardiac arrhythmias. The amount of potassium in the blood quantifies the loss, and in addition to treating the cause, potassium supplements may be considered in case of severe deficiency.