Hypoglycemia is a condition characterized by an abnormally low level of blood glucose and has significant clinical consequences if left untreated. It is a potential adverse event in the treatment of diabetes mellitus. Causes of hypoglycemia are varied, but in diabetic patients, it is most often iatrogenic. Medication changes or overdoses, infection, dietary changes, and changes in activity levels are some of the important reasons for a person to develop hypoglycemia. Prompt diagnosis and treatment of hypoglycemia is an essential component of the management of diabetes. Evaluation of the cause is important, especially if there are recurrent episodes of hypoglycemia.