Diabetic ketoacidosis (DKA) is a life-threatening complication of diabetes caused by relative or absolute insulin deficiency that results in hyperglycemia, ketosis, and acidosis. It occurs most often in patients with type 1 diabetes but can also affect those with type 2 diabetes. Treatment of DKA involves fluid resuscitation, intravenous insulin therapy, electrolyte replacement, and monitoring of glucose and acid-base levels until the condition is resolved. Complications can include hypokalemia, hypoglycemia, cerebral edema, and complications related to underlying illnesses. Strict diabetes management and patient education are needed to prevent DKA.