The gas exhaled when there is diabetic ketoacidosis will have the smell of rotten apples, mainly because diabetes mellitus, under the action of various triggers, has an obvious lack of insulin secretion or an inappropriate increase in glucagon, causing hyperglycemia and high blood ketones can also cause dehydration and electrolyte disorders, which can cause metabolic acidosis. In addition to exhaling the smell of rotten apples, it also tends to cause symptoms of the gastrointestinal tract, and breathing and consciousness will be altered, easily causing nausea, vomiting, dizziness, and headache. Severe cases can also cause coma and drowsiness. It is necessary to go to the hospital for blood gas analysis of blood glucose, and also to improve other tests, and generally supplement insulin to promote glucose utilization, and also to correct electrolyte disorders and dehydration.