Hypokalemia refers to low levels of potassium in the blood. Potassium ions are essential for normal functioning of neurons and muscles including heart. The normal levels of potassium in the blood are 3.6 to 5.2 mmol/L. Most common causes of hypokalemia are: - Use of diuretics - Excessive alcohol consumption - Vomiting - Diarrhea - Sweating - Chronic renal disease - Diabetic ketoacidosis - Folic acid deficiency - Primary aldosteronism Reference: https://www.mayoclinic.org/symptoms/low-potassium/basics/causes/sym-20050632 Image via: https://www.emedicinehealth.com/low_potassium/article_em.htm